Patent Application
20230348496
The present invention relates to pesticidally active, in particular insecticidally active heterocyclic derivatives containing sulfur substituents, to processes for their preparation, to compositions comprising those compounds, and to their use for controlling animal pests, including arthropods and in particular insects or representatives of the order Acarina.
Heterocyclic benzannulated dihydropyrrolone and phtalimide derivatives with sulfur-containing substituents have been described in the literature, for example in J. Org. Chem. 2003, 62, 8240 and Bull. Chem Soc. Chim. Belg. 1997, 106, 151. However, no compounds mentioned in these references have been described to exert a pesticidal effect. Structurally different pesticidally active heterocyclic derivatives with sulfur-containing substituents have been described, for example in WO 2012/012086848 and WO 2013/018928, JP2019043944 A, WO2017155103 A1, WO2018050825 A1, WO2020053282 A1, WO2019175045 A1.
It has now surprisingly been found that certain novel pesticidally active derivatives with sulfur containing substitutents have favourable properties as pesticides.
The present invention therefore provides compounds of formula I,
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I.
Compounds of formula I which have at least one basic centre can form, for example, acid addition salts, for example with strong inorganic acids such as mineral acids, for example perchloric acid, sulfuric acid, nitric acid, nitrous acid, a phosphorus acid or a hydrohalic acid, with strong organic carboxylic acids, such as C1-C4alkanecarboxylic acids which are unsubstituted or substituted, for example by halogen, for example acetic acid, such as saturated or unsaturated dicarboxylic acids, for example oxalic acid, malonic acid, succinic acid, maleic acid, fumaric acid or phthalic acid, such as hydroxycarboxylic acids, for example ascorbic acid, lactic acid, malic acid, tartaric acid or citric acid, or such as benzoic acid, or with organic sulfonic acids, such as C1-C4alkane- or arylsulfonic acids which are unsubstituted or substituted, for example by halogen, for example methane- or p-toluenesulfonic acid. Compounds of formula I which have at least one acidic group can form, for example, salts with bases, for example mineral salts such as alkali metal or alkaline earth metal salts, for example sodium, potassium or magnesium salts, or salts with ammonia or an organic amine, such as morpholine, piperidine, pyrrolidine, a mono-, di- or tri-lower-alkylamine, for example ethyl-, diethyl-, triethyl- or dimethylpropylamine, or a mono-, di- or trihydroxy-lower-alkylamine, for example mono-, di- or triethanolamine.
In each case, the compounds of formula (I) according to the invention are in free form, in oxidized form as a N-oxide or in salt form, e.g. an agronomically usable salt form.
N-oxides are oxidized forms of tertiary amines or oxidized forms of nitrogen containing heteroaromatic compounds. They are described for instance in the book “Heterocyclic N-oxides” by A. Albini and S. Pietra, CRC Press, Boca Raton 1991.
The compounds of formula I according to the invention also include hydrates which may be formed during the salt formation.
Where substituents are indicated as being itself further substituted, this means that they carry one or more identical or different substituents, e.g. one to four substituents. Normally not more than three such optional substituents are present at the same time. Preferably not more than two such substituents are present at the same time (i.e. the group is substituted by one or two of the substituents indicated). Where the additional substituent group is a larger group, such as cycloalkyl or phenyl, it is most preferred that only one such optional substituent is present. Where a group is indicated as being substituted, e.g. alkyl, this includes those groups that are part of other groups, e.g. the alkyl in alkylthio.
The term “C1-C6alkyl” as used herein refers to a saturated straight-chain or branched hydrocarbon radical attached via any of the carbon atoms having 1 to n carbon atoms, for example, any one of the radicals methyl, ethyl, n-propyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 2, 2-dimethylpropyl, 1-ethylpropyl, n-hexyl, n-pentyl, 1, 1-dimethylpropyl, 1, 2-dimethylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1, 1-dimethylbutyl, 1,2-dimethylbutyl, 1, 3-dimethylbutyl, 2, 2-dimethylbutyl, 2, 3-dimethylbutyl, 3, 3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl, 1,1, 2-trimethylpropyl, 1,2, 2-trimethylpropyl, 1-ethyl-1-methylpropyl, or 1-ethyl-2-methylpropyl.
The term “C1-Cnhaloalkyl” as used herein refers to a straight-chain or branched saturated alkyl radical attached via any of the carbon atoms having 1 to n carbon atoms (as mentioned above), where some or all of the hydrogen atoms in these radicals may be replaced by fluorine, chlorine, bromine and/or iodine, i.e., for example, any one of chloromethyl, dichloromethyl, trichloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl, chlorofluoromethyl, dichlorofluoromethyl, chlorodifluoromethyl, 2-fluoroethyl, 2-chloroethyl, 2-bromoethyl, 2-iodoethyl, 2, 2-difluoroethyl, 2,2, 2-trifluoroethyl, 2-chloro-2-fluoroethyl, 2-chloro-2, 2-difluoroethyl, 2, 2-dichloro-2-fluoroethyl, 2,2, 2-trichloroethyl, pentafluoroethyl, 2-fluoropropyl, 3-fluoropropyl, 2,2-difluoropropyl, 2, 3-difluoropropyl, 2-chloropropyl, 3-chloropropyl, 2, 3-dichloropropyl, 2-bromopropyl, 3-bromopropyl, 3,3, 3-trifluoropropyl, 3,3, 3-trichloropropyl, 2,2, 3,3, 3-pentafluoropropyl, heptafluoropropyl, 1-(fluoromethyl)-2-fluoroethyl, 1-(chloromethyl)-2-chloroethyl, 1-(bromomethyl)-2-bromoethyl, 4-fluorobutyl, 4-chlorobutyl, 4-bromobutyl or nonafluorobutyl. Accordingly, a term such as “C1-C2-fluoroalkyl” would refer to a C1-C2-alkyl radical which carries 1,2, 3,4, or 5 fluorine atoms, for example, any one of difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 2, 2-difluoroethyl, 2,2, 2-trifluoroethyl, 1,1, 2, 2-tetrafluoroethyl or penta-fluoroethyl.
The term “C1-Cnalkoxy” as used herein refers to a straight-chain or branched saturated alkyl radical having 1 to n carbon atoms (as mentioned above) which is attached via an oxygen atom, i.e., for example, any one of methoxy, ethoxy, n-propoxy, 1-methylethoxy, n-butoxy, 1-methylpropoxy, 2-methylpropoxy or 1, 1-dimethylethoxy.
The term “C1-Cnhaloalkoxy” as used herein refers to a C1-Cnalkoxy radical as mentioned above which is partially or fully substituted by fluorine, chlorine, bromine and/or iodine, i.e., for example, any one of chloromethoxy, dichloromethoxy, trichloromethoxy, fluoromethoxy, difluoromethoxy, trifluoromethoxy, chlorofluoromethoxy, dichlorofluoromethoxy, chlorodifluoromethoxy, 2-fluoroethoxy, 2-chloroethoxy, 2-bromoethoxy, 2-iodoethoxy, 2, 2-difluoroethoxy, 2,2, 2-trifluoroethoxy, 2-chloro-2-fluoroethoxy, 2-chloro-2, 2-difluoroethoxy, 2, 2-dichloro-2-fluoroethoxy, 2,2, 2-trichloroethoxy, pentafluoroeth-oxy, 2-fluoropropoxy, 3-fluoropropoxy, 2, 2-difluoropropoxy, 2, 3-difluoropropoxy, 2-chloropropoxy, 3-chloropropoxy, 2, 3-dichloropropoxy, 2-bromopropoxy, 3-bromopropoxy, 3,3, 3-trifluoropropoxy, 3,3, 3-trichloropropoxy, 2,2, 3,3, 3-pentafluoropropoxy, heptafluoropropoxy, 1-(fluoromethyl)-2-fluoroethoxy, 1-(chloromethyl)-2-chloroethoxy, 1-(bromomethyl)-2-bromoethoxy, 4-fluorobutoxy, 4-chlorobutoxy, or 4-bromobutoxy.
The term “C1-Cn-alkylsulfanyl” as used herein refers to a straight chain or branched saturated alkyl radical having 1 to n carbon atoms (as mentioned above) which is attached via a sulfur atom, i.e., for example, any one of methylthio, ethylthio, n-propylthio, 1-methylethylthio, butylthio, 1-methylpropylthio, 2-methylpropylthio or 1, 1-dimethylethylthio.
The term “C1-Cnalkylsulfinyl” as used herein refers to a straight chain or branched saturated alkyl radical having 1 to n carbon atoms (as mentioned above) which is attached via the sulfur atom of the sulfinyl group, i.e., for example, any one of methylsulfinyl, ethylsulfinyl, n-propylsulfinyl, 1-methylethyl-sulfinyl, n-butylsulfinyl, 1-methylpropylsulfinyl, 2-methylpropylsulfinyl, 1, 1-dimethyl-ethylsulfinyl, n-pentylsulfinyl, 1-methylbutylsulfinyl, 2-methylbutylsulfinyl, 3-methyl-butylsulfinyl, 1, 1-dimethylpropylsulfinyl, 1, 2-dimethylpropylsulfinyl, 2,2-dimethylpropylsulfinyl or 1-ethylpropylsulfinyl.
The term “C1-Cnalkylsulfonyl” as used herein refers to a straight chain or branched saturated alkyl radical having 1 to n carbon atoms (as mentioned above) which is attached via the sulfur atom of the sulfonyl group, i.e., for example, any one of methylsulfonyl, ethylsulfonyl, n-propylsulfonyl, isopropylsulfonyl, n-butylsulfonyl, 1-methylpropylsulfonyl, 2-methylpropylsulfonyl ort-butylsulphonyl.
The term “C1-Cnhaloalkylsulfanyl” as used herein refers to a straight chain or branched saturated alkyl radical having 1 to n carbon atoms which is attached via a sulfur atom as C1-Cnalkysulfanyl (i.e., C1-Cnalkylthio) radical (as mentioned above) which is partially or fully substituted by fluorine, chlorine, bromine and/or iodine, i.e., for example, any one of fluoromethylthio, difluoromethylthio, trifluoromethylthio, chlorodifluoromethylthio, bromodifluoromethylthio, 2-fluoroethylthio, 2-chloroethylthio, 2-bromoethylthio, 2-iodoethylthio, 2, 2-difluoroethylthio, 2,2,2-trifluoroethylthio, 2,2, 2-trichloroethylthio, 2-chloro-2-fluoroethylthio, 2-chloro-2,2-difluoroethylthio, 2, 2-dichloro-2-fluoroethylthio, pentafluoroethylthio, 2-fluoropropylthio, 3-fluoropropylthio, 2-chloropropylthio, 3-chloropropylthio, 2-bromopropylthio, 3-bromopropylthio, 2,2-difluoropropylthio, 2,3-difluoropropylthio, 2, 3-dichloropropylthio, 3,3, 3-trifluoropropylthio, 3,3, 3-trichloropropylthio, 2,2, 3,3, 3-pentafluoropropylthio, heptafluoropropylthio, 1-(fluoromethyl)-2-fluoroethylthio, 1-(chloromethyl)-2-chloroethylthio, 1-(bromomethyl)-2-bromoethylthio, 4-fluorobutylthio, 4-chlorobutylthio, or 4-bromobutylthio.
The term “C1-Cnhaloalkylsulfinyl” and “C1-Cnhaloalkylsulfonyl” refers to the groups above but with the sulfur in oxidations state 1 or 2 respectively.
The term “C1-Cnhaloalkylsulfonyloxy” as used herein refers to a C1-Cnhaloalkylsulfonyl (as mentioned above) which is attached via an oxygen atom.
The term “C1-Cncyanoalkyl” as used herein refers to a straight chain or branched saturated alkyl radicals having 1 to n carbon atoms (as mentioned above) which is substituted by a cyano group, for example cyanomethylene, cyanoethylene, 1,1-dimethylcyanomethyl, cyanomethyl, cyanoethyl, cyanoisopropyl and 1-dimethylcyanomethyl.
The term “C1-Cncyanoalkoxy” as used herein refers to a C1-Cncyanoalkyl (as mentioned above) but which is attached via an oxygen atom.
The term “C3-C6cycloalkyl” as used herein refers to 3-6 membered cycloylkyl groups such as cyclopropane, cyclobutane, cyclopropane, cyclopentane and cyclohexane.
The suffix “—C1-Cnalkyl” after terms such as “C3-C6cycloalkyl as used herein refers to a straight chain or branched saturated alkyl radicals which is substituted by C3-C6cycloalkyl. An example of C3-C6cycloalkyl-C1-C6alkyl is for example, cyclopropylmethyl.
The term “C3-C6cycloalkyl” monosubstituted by cyano as used herein refers to refers to 3-6 membered cycloylkyl groups (as mentioned above) which is substituted by a cyano group. An example of C3-C6cycloalkyl monosubstituted by cyano is 1-cyanocyclopropyl.
Halogen is generally fluorine, chlorine, bromine or iodine. This also applies, correspondingly, to halogen in combination with other meanings, such as haloalkyl.
Certain embodiments according to the invention are provided as set out below.
Embodiment 1 provides compounds of formula I, or an agrochemically acceptable salt, stereoisomer, enantiomer, tautomer or N-oxide thereof, as defined above.
Embodiment 2 provides compounds, or an agrochemically acceptable salt, stereoisomer, enantiomer, tautomer or N-oxide thereof, according to embodiment 1 wherein R2, G1, G2, X, R1, R3, R4, R5 and R6 as set out below.
With respect to embodiments 1-2, preferred values of R2, G1, G2, X, R1, R3, R4, R5, and R6 are, in any combination thereof, as set out below:
Preferably R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy.
More preferably R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy.
Even more preferably R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3.
Most preferably R2 is —CF3, —SO2CF3 or —OCF3.
Preferably either G1 is N and G2 is CH, or G1 is CH and G2 is N.
Also preferred is when both G1 and G2 are N.
Also preferred is when both G1 and G2 are CH.
More preferably G1 is N and G2 is CH, or both G1 and G2 are CH.
Preferably X is S or SO2.
Most preferably X is SO2.
Preferably R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl.
More preferably R1 is ethyl or cyclopropylmethyl.
Most preferably R1 is ethyl.
Preferably R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; More preferably R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
Even more preferably R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
Even more preferably R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
Even more preferably R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
Most preferably R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
Utmost preferably R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or
Preferably R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
Preferably R5 and R6 are, independently from each other, hydrogen or C1-C4alkyl.
More preferably R5 and R6 are, independently from each other, hydrogen or methyl.
Most preferably R5 is hydrogen or methyl, and R6 is methyl.
Further embodiments according to the invention are provided as set forth below.
A preferred group of compounds of formula I is represented by the compounds of formula I-1
In one preferred group of compounds of formula I-1, R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl; R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy; R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; and R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
In another preferred group of compounds of formula I-1, R1 is ethyl or cyclopropylmethyl; X is S or SO2; R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy; and R3 and R4 are, independently from each other hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
In a further preferred group of compounds of formula I-1, R1 is ethyl; X is SO2; R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3; and R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
One preferred group of compounds according to this embodiment are compounds of formula (I-1a) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein R2 is —CF3 or —SO2CF3, preferably R2 is —CF3; X is S or SO2; preferably X is SO2; and R1 is ethyl or cyclopropylmethyl; preferably R1 is ethyl.
Another preferred group of compounds according to this embodiment are compounds of formula (I-1b-1) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein R4 is hydrogen; and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or wherein R3 is hydrogen and R4 is hydrogen, trifluoromethyl, 1,1-difluoroethane, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
Another preferred group of compounds according to this embodiment are compounds of formula (I-1b-2) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or wherein R3 is hydrogen and R4 is hydrogen, trifluoromethyl, 1,1-difluoroethane, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
A further preferred group of compounds according to this embodiment are compounds of formula (I-1c) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein G1 is N and G2 is CH.
One preferred group of compounds according to this embodiment are compounds of formula (I-1d) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein G1 is CH and G2 is N.
Another preferred group of compounds according to this embodiment are compounds of formula (I-1e) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein both G1 and G2 are N.
Another preferred group of compounds according to this embodiment are compounds of formula (I-1f which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein both G1 and G2 are CH.
Another preferred group of compounds according to this embodiment are compounds of formula (I-1g) which are compounds of formula (I-1), or of any of the preferred embodiments of the compounds of formula (I-1), wherein R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl; preferably, R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl; more preferably, R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl.
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I-1.
Another preferred group of compounds of formula I is represented by the compounds of formula I-2
In one preferred group of compounds of formula I-2, R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl; R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy; and X is S or SO2.
In another preferred group of compounds of formula I-2, R1 is ethyl or cyclopropylmethyl; R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy; and X is S or SO2.
In a further preferred group of compounds of formula I-2, R1 is ethyl; X is SO2; and R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3.
In yet a further preferred group of compounds of formula I-2, R1 is ethyl; X is SO2; and R2 is —CF3, —SO2CF3 or —OCF3.
One preferred group of compounds according to this embodiment are compounds of formula (I-2a) which are compounds of formula (I-2), or of any of the preferred embodiments of the compounds of formula (I-2), wherein R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; and R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
In another preferred group of compounds of formula I-2a, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; preferably, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
A further preferred group of compounds of formula I-2a are those compounds, wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
wherein R3 is hydrogen and R4 is trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
Yet a further preferred group of compounds of formula I-2a are those compounds, wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
Another preferred group of compounds according to this embodiment are compounds of formula (I-2a), or of any of the preferred embodiments of the compounds of formula (I-2a), wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl.
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I-2.
Another preferred group of compounds of formula I is represented by the compounds of formula I-3
In one preferred group of compounds of formula I-3, R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl; R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy; and X is S or SO2.
In another preferred group of compounds of formula I-3, R1 is ethyl or cyclopropylmethyl; R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy; and X is S or SO2.
In a further preferred group of compounds of formula I-3, R1 is ethyl; X is SO2; and R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3.
In yet a further preferred group of compounds of formula I-3, R1 is ethyl; X is SO2; and R2 is —CF3, —SO2CF3 or —OCF3.
One preferred group of compounds according to this embodiment are compounds of formula (I-3a) which are compounds of formula (I-3), or of any of the preferred embodiments of the compounds of formula (I-3), wherein R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; and R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
In another preferred group of compounds of formula I-3a, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; preferably, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
A further preferred group of compounds of formula I-3a are those compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or wherein R3 is hydrogen and R4 is trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
Yet a further preferred group of compounds of formula I-3a are those compounds, wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
An outstanding group of compounds of formula I-3a are the compounds of formula (I-3a-1) wherein:
Another outstanding group of compounds of formula I-3a are the compounds of formula (I-3a-2) wherein:
Another preferred group of compounds according to this embodiment (I-3a-2) are compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl.
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I-3.
Another preferred group of compounds of formula I is represented by the compounds of formula I-4
In one preferred group of compounds of formula I-4, R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl; R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy; and X is S or SO2.
In another preferred group of compounds of formula I-4, R1 is ethyl or cyclopropylmethyl; R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy; and X is S or SO2.
In a further preferred group of compounds of formula I-4, R1 is ethyl; X is SO2; and R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3.
In yet a further preferred group of compounds of formula I-4, R1 is ethyl; X is SO2; and R2 is —CF3, —SO2CF3 or —OCF3.
One preferred group of compounds according to this embodiment are compounds of formula (I-4a) which are compounds of formula (I-4), or of any of the preferred embodiments of the compounds of formula (I-4), wherein R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; and R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
In another preferred group of compounds of formula I-4a, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; preferably, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
A further preferred group of compounds of formula I-4a are those compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or wherein R3 is hydrogen and R4 is trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3.
Yet a further preferred group of compounds of formula I-4a are those compounds, wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
An outstanding group of compounds of formula I-4a are the compounds of formula (I-4a-1) wherein:
Another outstanding group of compounds of formula I-4a are the compounds of formula (I-4a-2) wherein:
Another preferred group of compounds according to this embodiment (I-4a-2) are compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl.
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I-4.
Another preferred group of compounds of formula I is represented by the compounds of formula I-5
In one preferred group of compounds of formula I-5, R1 is C1-C4alkyl or cyclopropyl-C1-C4alkyl; R2 is C1-C2haloalkyl, C1-C2haloalkylsulfanyl, C1-C2haloalkylsulfinyl, C1-C2haloalkylsulfonyl, C1-C2haloalkoxy or C1-C2haloalkylsulfonyloxy; and X is S or SO2.
In another preferred group of compounds of formula I-5, R1 is ethyl or cyclopropylmethyl; R2 is C1-C2fluoroalkyl, C1-C2fluoroalkylsulfanyl, C1-C2fluoroalkylsulfinyl, C1-C2fluoroalkylsulfonyl, C1-C2fluoroalkoxy or C1-C2fluoroalkylsulfonyloxy; and X is S or SO2.
In a further preferred group of compounds of formula I-5, R1 is ethyl; X is SO2; and R2 is —CF3, —CF2CF3, —SCF3, —SOCF3, —SO2CF3, —OCF3 or —OSO2CF3.
In yet a further preferred group of compounds of formula I-5, R1 is ethyl; X is SO2; and R2 is —CF3, —SO2CF3 or —OCF3.
One preferred group of compounds according to this embodiment are compounds of formula (I-5a) which are compounds of formula (I-5), or of any of the preferred embodiments of the compounds of formula (I-5), wherein R3 and R4 are, independently from each other, hydrogen, halogen, C1-C4alkyl, C1-C6haloalkyl, C3-C6cycloalkyl, C3-C6cycloalkyl monosubstituted by cyano, C1-C6cyanoalkyl, C1-C6cyanoalkoxy, cyano, C1-C4alkoxy, C1-C6haloalkoxy, —N(R5R6), or —N(R5)C(═O)R6; and R5 and R6 are, independently from each other, hydrogen, C1-C4alkyl, C1-C6haloalkyl, or C3-C6cycloalkyl.
In another preferred group of compounds of formula I-5a, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; preferably, R3 and R4 are, independently from each other, hydrogen, trifluoromethyl, cyclopropyl, cyanocyclopropyl, or cyanoisopropyl.
A further preferred group of compounds of formula I-5a are those compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, cyanocyclopropyl, cyanoisopropyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
Yet a further preferred group of compounds of formula I-5a are those compounds, wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, 1,1-difluoroethyl, —OCHF2, —OCH2CHF2, —OCH2CF3, cyclopropyl, 1-cyanocyclopropyl, 1-cyano-1-methyl-ethyl, trifluoromethoxy, —CHF2, —OC(CH3)2CN, —NHC(O)CH3 or —NCH3C(O)CH3; or
Another preferred group of compounds according to formula I-5a are compounds wherein R4 is hydrogen and R3 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl; or R3 is hydrogen and R4 is hydrogen, trifluoromethyl, cyclopropyl, 1-cyanocyclopropyl, or 1-cyano-1-methyl-ethyl.
The present invention also provides agrochemically acceptable salts, stereoisomers, enantiomers, tautomers and N-oxides of the compounds of formula I-5.
An outstanding group of compounds of formula I is represented by the compounds of formula I-6
One further outstanding group of compounds according to this embodiment are compounds of formula (I-6a) which are compounds of formula (I-6) wherein
One further outstanding group of compounds according to this embodiment are compounds of formula (I-6b) which are compounds of formula (I-6a) wherein
One further outstanding group of compounds according to this embodiment are compounds of formula (I-6c) which are compounds of formula (I-6a) wherein
One further outstanding group of compounds according to this embodiment are compounds of formula (I-6d) which are compounds of formula (I-6a) wherein
One further outstanding group of compounds according to this embodiment are compounds of formula (I-6e) which are compounds of formula (I-6a) wherein
One further outstanding group of compounds according to this embodiment are compounds of formula (I-60 which are compounds of formula (I-6a) wherein
Compounds according to the invention may possess any number of benefits including, inter alia, advantageous levels of biological activity for protecting plants against insects or superior properties for use as agrochemical active ingredients (for example, greater biological activity, an advantageous spectrum of activity, an increased safety profile, improved physico-chemical properties, or increased biodegradability or environmental profile). In particular, it has been surprisingly found that certain compounds of formula (I) may show an advantageous safety profile with respect to non-target arthropods, in particular pollinators such as honey bees, solitary bees, and bumble bees. Most particularly, Apis mellifera.
In another aspect the present invention provides a composition comprising an insecticidally, acaricidally, nematicidally or molluscicidally effective amount of a compound of formula (I), or an agrochemically acceptable salt, stereoisomer, enantiomer, tautomer or N-oxide thereof, as defined in any of the embodiments under compounds of formula (I), (I-1), (I-2), (I-2), (I-3), (I-4), (I-5) and (I-6) (above), and, optionally, an auxiliary or diluent.
In a further aspect the present invention provides a method of combating and controlling insects, acarines, nematodes or molluscs which comprises applying to a pest, to a locus of a pest, or to a plant susceptible to attack by a pest an insecticidally, acaricidally, nematicidally or molluscicidally effective amount of a compound of formula (I), or an agrochemically acceptable salt, stereoisomer, enantiomer, tautomer or N-oxide thereof, as defined in any of the embodiments under compounds of formula (I), (I-1), (I-2), (I-2), (I-3), (I-4), (I-5) and (I-6) (above) or a composition as defined above.
In a yet further aspect, the present invention provides a method for the protection of plant propagation material from the attack by insects, acarines, nematodes or molluscs, which comprises treating the propagation material or the site, where the propagation material is planted, with a composition as defined above.
The process according to the invention for preparing compounds of formula I is carried out in principle by methods known to those skilled in the art. More specifically, and as described in scheme A, the subgroup of compounds of formula I, wherein X is SO (sulfoxide) and/or SO2 (sulfone), may be obtained by means of an oxidation reaction of the corresponding sulfide compounds of formula I, wherein X is S, involving reagents such as, for example, m-chloroperoxybenzoic acid (mCPBA), hydrogen peroxide, oxone, sodium periodate, sodium hypochlorite or tert-butyl hypochlorite amongst other oxidants. The oxidation reaction is generally conducted in the presence of a solvent. Examples of the solvent to be used in the reaction include aliphatic halogenated hydrocarbons such as dichloromethane and chloroform; alcohols such as methanol and ethanol; acetic acid; water; and mixtures thereof. The amount of the oxidant to be used in the reaction is generally 1 to 3 moles, preferably 1 to 1.2 moles, relative to 1 mole of the sulfide compounds I to produce the sulfoxide compounds I, and preferably 2 to 2.2 moles of oxidant, relative to 1 mole of of the sulfide compounds I to produce the sulfone compounds I. Such oxidation reactions are disclosed, for example, in WO 2013/018928.
Scheme A illustrates the oxidation chemistry described above to access compounds of formula I-a2 and I-a3 from compounds of formula I-a1, wherein G1, G2, R1, R2, R3 and R4 are as defined in formula I.
Compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above,
Alternatively, compounds of formula I wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above may be prepared by reacting compounds of formula VII, wherein R2, G1, and G2 are defined as formula I above, with compounds of formula VIII, wherein R1, X, R3, R4, R5 and R6 are as defined in formula I above and in which LG3 is a halogen (or a pseudo-halogen leaving group, such as a triflate), preferably bromo or iodo, in the presence of a base, such as sodium carbonate, potassium carbonate or cesium carbonate, or potassium tert-butoxide, in the presence of a metal catalyst, either a copper catalyst, for example copper(I) iodide, optionally in the presence of a ligand, for example a diamine ligands (e.g. N,N′-dimethylethylenediamine or trans-cyclohexyldiamine) or dibenzylideneacetone (dba), or 1,10-phenanthroline, at temperatures between 30-180° C., optionally under microwave irradiation, or a palladium catalyst, for example palladium(II)acetate, bis(dibenzylideneacetone)palladium(0) (Pd(dba)2) or tris(dibenzylideneacetone)dipalladium(0) (Pd2(dba)3, optionally in form of a chloroform adduct), or a palladium pre-catalyst such as for example tert-BuBrettPhos Pd G3 [(2-Di-tert-butylphosphino-3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate or BrettPhos Pd G3 [(2-di-cyclohexylphosphino-3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate, and optionally in the presence of a ligand, for example SPhos, t-BuBrettPhos or Xantphos, at temperatures between 60-120° C., optionally under microwave irradiation. The above reaction may be carried out in the presence of solvent such as toluene, dimethylformamide DMF, N-methyl pyrrolidine NMP, dimethyl sulfoxide DMSO, dioxane, tetrahydrofuran THE and are described in literature for example in WO2012031004, WO2009042907 and Synthetic Communications 2011, 41: 67-72.
Alternatively, compounds of formula I wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above may be prepared (scheme 1) by reacting compounds of formula VI, wherein R2, G1 and G2 are as defined in formula I above, and LG2 is a leaving group, for example Br, Cl or I (preferably bromo), and R is C1-C6alkyl, benzyl or a phenyl group, with compounds of formula IX, wherein R1, X, R3, R4, R5 and R6 are as defined in formula I above, in the presence of base, such as sodium carbonate, potassium carbonate or cesium carbonate, or sodium hydride, N,N-diisopropylethylamine or KOtBu, and in the presence of solvent such as ethanol, methanol, dioxane, toluene, acetonitrile, DMF, DMA, DMSO, THF, at temperatures between 0 and 150° C., optionally under microwave irradiation. Such reactions proceed via nucleophilic substitution and subsequent cyclization and are also reported in literature, for example in WO2009042907.
Alternatively, compounds of formula I wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above can be prepared (scheme 1) by cyclizing compounds of formula X, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I, for example in the presence of phosphorus oxychloride (other amide coupling reagent may also be used, such as thionyl chloride SOCl2, HATU or EDCl), optionally in the presence of a base, such as triethylamine, pyridine or Hunig's base, optionally in the presence of a solvent or diluent, such as toluene or xylene, at temperatures between 0 and 180° C., preferably between 20 and 120° C.
Compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above,
Compounds of formula Xa, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, and in which X0 is halogen, preferably chlorine, or X0 is either X01 or X02, can be prepared by activation of compound of formula X, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, by methods known to those skilled in the art and described in, for example, Tetrahedron, 2005, 61 (46), 10827-10852. Preferred is the formation of an activated species Xa, wherein R1, R2, G1, G2, X, R3, R4, R5, and RB are defined as under formula I above and in which X0 is halogen, preferably chlorine. For example, compounds Xa where X0 is halogen, preferably chlorine, are formed by treatment of X with, for example, oxalyl chloride (COCl)2 or thionyl chloride SOCl2 in the presence of catalytic quantities of N,N-dimethylformamide DMF in inert solvents such as methylene chloride CH2Cl2 or tetrahydrofuran THF at temperatures between 20 to 100° C., preferably 25° C. Alternatively, treatment of compounds of formula X with, for example, 1-ethyl-3-(3-dimethylaminopropyl)carbo-diimide EDC or dicyclohexyl carbodiimide DCC will generate an activated species Xa, wherein X0 is X01 or X02 respectively, in an inert solvent, such as pyridine or tetrahydrofuran THF, optionally in the presence of a base, such as triethylamine, at temperatures between 50-180° C.
Compounds of formula VII, wherein R2, G1 and G2 are as defined in formula I above can be prepared (scheme 1) by reacting compounds of formula VI, wherein R2, G1 and G2 are as defined in formula I above, and LG2 is a leaving group for example Br, Cl or I (preferably bromo), and R is C1-C6alkyl, benzyl or phenyl group, with ammonia or surrogates of ammonia, for example NH4OH, in the presence of solvent such as ethanol, methanol, dioxane, toluene, DMF, DMA, DMSO, THF at temperatures between 0 and 150° C., optionally under microwave irradiation.
Compounds of formula X, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, can be prepared (scheme 1) by nucleophilic substitution reaction of compound of formula VI, wherein R2, G1 and G2 are as defined in formula I above, and LG2 is a leaving group for example Br, Cl or I (preferably bromo), and R is C1-C6alkyl, benzyl or phenyl group, with an amino compound of formula IX, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, under conditions described above, followed by in situ hydrolysis of the formed intermediate ester of formula XVII, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, and in which R is C1-C6alkyl, benzyl or a phenyl group.
The in situ generated unhydrolyzed ester compound of formula XVII may be isolated and can also be converted via saponification reaction, in the presence of suitable base for example sodium hydroxide NaOH, lithium hydroxide LiOH, or barium hydroxide Ba(OH)2, in the presence of a solvent such as ethanol, methanol, dioxane, tetrahydrofuran or water (or mixtures thereof), to form the carboxylic acid of formula X. Alternatively, Krapcho-type conditions (e.g. heating the substrate XVII in the presence of sodium or lithium chloride in N-methyl pyrrolidone or aqueous dimethylsulfoxide DMSO, optionally under microwave irradiation) can also be used to convert compounds of formula XVII into compounds of formula X. The direct conversion of compound of formula VI to compound of formula X can be carried out in the presence of base, such as sodium hydride, KOtBu, butyllithium, or lithium diisopropylamide amongst others, and in the presence of a solvent such as dioxane, DMF, DMA, DMSO, THF, at temperatures between −30 and 150° C.
The above reaction for the preparation of compounds of formula X can also be carried out by reacting compounds of formula VI, with compounds of formula IXa, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, and PG is an amino protecting group, for example tert-butyloxycarbonyl (BOC) under similar conditions as described above (as for the preparation of compounds of formula X by reacting compounds of formula VI and compounds of formula IX), followed by deprotection of the amino protecting group PG. The deprotection of the amino protecting groups are well known to those skilled in the art, for example BOC protecting groups can be removed in the presence of acid such as hydrochloric acid, or trifluoroacetic acid, optionally in the presence of an inert solvent, such as dichloromethane, tetrahydrofuran, dioxane or benzotrifluoride, at temperatures between 0 and 70° C. This process of forming compounds of formula X (and I) from compounds of formula VI and IXa is detailed in scheme 2a and reflecting the particular situation wherein the group PG of IXa is tert-butyloxycarbonyl (BOC), defining compounds of formula XIX, wherein Q is as defined in formula I above.
Compounds of formula VI and compounds of formula XIX react to compounds of formula XVIIa, in the presence of a base, such as sodium carbonate, potassium carbonate or cesium carbonate, or sodium hydride, or N,N-diisopropylethylamine or potassium tert-butoxide KOtBu, in the presence of a solvent such as ethanol, methanol, dioxane, toluene, acetonitrile, DMF, N,N-dimethylacetamide DMA, DMSO, or THF, at temperatures between 0 and 150° C., optionally under microwave irradiation. tert-Butyloxycarbonyl (BOC) group removal in compounds of formula XVIIa, mediated by acids, such as hydrochloric acid, or trifluoroacetic acid, optionally in the presence of an inert solvent, such as dichloromethane, tetrahydrofuran, dioxane or benzotrifluoride, at temperatures between 0 and 70° C., generates compounds of formula XVII. Saponification of compounds of formula XVII in the presence of a suitable base, for example sodium hydroxide NaOH, lithium hydroxide LiOH or barium hydroxide Ba(OH)2, in the presence of a solvent such as ethanol, methanol, dioxane, tetrahydrofuran or water (or mixtures thereof), forms the carboxylic acids of formula X (alternatively, Krapcho-type conditions as described above may be used). Cyclization of compounds of formula X to compounds of formula I is achieved, for example, in the presence of phosphorus oxychloride (other amide coupling reagent may also be used, such as thionyl chloride SOCl2, HATU or EDCl), optionally in the presence of a base, such as triethylamine, pyridine or Hunig's base, optionally in the presence of a solvent or diluent, such as toluene or xylene, at temperatures between 0 and 180° C., preferably between 20 and 120° C. Alternatively, a direct cyclization of compounds of formula XVII into compounds of formula I may be achieved under conditions mentioned below in scheme 6.
Compounds of formula VI, wherein R2, G1 and G2 are as defined in formula I above, and LG2 is a halogen leaving group, for example bromo Br, chloro Cl or iodo I (preferably bromo), and R is C1-C6alkyl, benzyl or a phenyl group, are either known (see preparation descriptions disclosed in WO20/174094) or may be prepared by methods known to a person skilled in the art. For example, compounds of formula VI, wherein R2, G1 and G2 are as defined in formula I above, and LG2 is a leaving group for example Br, Cl or I (preferably bromo), and R is C1-C6alkyl, benzyl or phenyl group, can be prepared by a radical induced benzylic halogenation of compounds of formula V, wherein R2, G1 and G2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or a phenyl group. Such reaction are well known to those skilled in the art and may be carried out in the presence of electrophilic halogenating reagents, such as Br2, NBS, Cl2, NIS amongst others, and in the presence of radical initiator for example AIBN (azobisisobutyronitrile), benzoyl peroxide or under photochemical conditions, and in the presence of a solvent such as toluene, xylene, acetonitrile, hexane, dichloroethane, or carbon tetrachloride, and at temperatures ranging from 20° C. to the boiling point of the reaction mixture. Such reactions are known by the name of Wohl-Ziegler bromination and are reported in literature, for example in Synthesis 2015, 47:1280-1290 and J. Am. Chem. Soc. 1963, 85 (3):354-355.
Compounds of formula V, wherein R2, G1 and G2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or a phenyl group, may be prepared (scheme 1) by a Suzuki reaction, which involves for example, reacting compounds of formula IV, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is a halogen Br, Cl, I (preferably Cl), and R is C1-C6alkyl, benzyl or a phenyl group, with trimethylboroxine or potassium methyltrifluoroborate amongst other methyl boronic acid equivalent. The reaction may be catalyzed by a palladium based catalyst, for example tetrakis(triphenyl-phosphine)palladium(0), (1,1′bis(diphenylphosphino)ferrocene)dichloro-palladium-dichloromethane (1:1 complex) or chloro(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) (XPhos palladacycle), in the presence of a base, such as sodium carbonate, tripotassium phosphate or cesium fluoride, in a solvent or a solvent mixture, like, for example dioxane, acetonitrile, N,N-dimethylformamide, a mixture of 1,2-dimethoxyethane and water or of dioxane/water, or of toluene/water, preferably under inert atmosphere. The reaction temperature can preferentially range from room temperature to the boiling point of the reaction mixture, or the reaction may be performed under microwave irradiation. Such Suzuki reactions are well known to those skilled in the art and have been reviewed, for example, in J. Organomet. Chem. 1999, 576:147-168.
Compounds of formula IV, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is a halogen Br, Cl, I (preferably Cl), and R is C1-C6alkyl, benzyl or phenyl group, can be prepared (scheme 1) by reacting compounds of formula III, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is halogen Br, Cl, I (preferably Cl), and ROH, wherein R is C1-C6alkyl, benzyl or a phenyl group, in the presence of acid catalyst, for example sulfuric acid, or a Lewis acid such as for example Sc(OTf)3 or FeCl3. Such reactions are well known to those skilled in the state of art and known by the name of Fischer esterification reaction and are reported in literature for example in J. Org. Chem. 2006, 71:3332-3334, Chem. Commun. 1997, 351-352 and Synthesis 2008, 3407-3410. Such esterification reaction can also be carried out by reacting compounds of formula III with TMSCHN2 to form compounds of formula IV, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is halogen Br, Cl, I (preferably Cl), and in which R is methyl, and are reported in Angew. Chem. Int. Ed. 2007, 46:7075.
Compounds of formula III, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is a halogen Br, Cl, I (preferably Cl), can be prepared (scheme 1) by a metalation reaction of compounds of formula II, wherein R2, G1 and G2 are as defined in formula I above, and LG1 is halogen Br, Cl, I (preferably Cl), with a suitable base, and subsequent reaction with carbon dioxide. Such metalation reaction can be performed using bases such as, for example, organolithium compounds, such as lithium tetramethylpiperidide, lithium diisopropylamide, or sec-BuLi amongst others, at temperatures ranging from −78 to 40° C., in the presence of a solvent such as THF, DMPU, dioxane, or 2-Me-THF. Such reactions are reported in literature for example in Tetrahedron 2004, 60(51):11869-11874.
Alternatively, compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, can be prepared by performing an amidation reaction on compounds of formula X, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, following scheme 3.
The reaction details for the transformation of compounds of formula X, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I, into compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, are illustrated in scheme 4, and follow methods and conditions already described in scheme 2 above.
Compounds of formula X can be prepared by reacting compounds of formula XII, wherein G1, G2, R2 are as defined in formula I above, with compounds of formula IX, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, under reductive amination conditions and subsequent cyclization reaction (see scheme 4). The reaction can be carried out in the presence of a reducing agent, for example sodium cyanoborohydride, sodium triacetoxyborohydride, amongst others and optionally in the presence of acid such as trifluoroacetic acid, formic acid, acetic acid amongst others, and at temperatures ranging from 0° C. to the boiling point of the reaction mixture. The reaction can be carried out in the presence of inert solvents such as ethanol, methanol, dioxane or tetrahydrofuran. Such reactions involving two step conversion from compounds of formula XII to compounds of formula I have been described in literature for example in Bioorganic & Medicinal Chemistry Letters 2016, 26:5947-5950.
Compounds of formula XII, wherein G1, G2, and R2 are as defined in formula I above, can be prepared from compound of formula XI, wherein G1, G2, and R2 are as defined in formula I above, and LG2 is chloro, bromo or iodo (preferably bromo), and R is C1-C6alkyl, benzyl or phenyl group, by a hydrolysis reaction. The reaction can be carried out either under basic conditions, using metal hydroxide, for example using aqueous sodium hydroxide, in the presence of a solvent such as dioxane, tetrahydrofuran or water, and at temperature ranging from 20 to 150° C., as reported in Synlett 1992, (6), 531-533, or under aqueous acidic conditions, for example using acetic acid, hydrochloric acid or sulfuric acid, in the presence of a solvent such as water, dioxane, or halogenate solvents, such as dichloroethane, as reported in Tetrahedron 2006, 62:9589-9602. Compounds of formula XI, wherein G1, G2, and R2 are as defined in formula I above, and LG2 is chloro, bromo or iodo (preferably bromo), and R is C1-C6alkyl, benzyl or phenyl group, can be prepared from compounds of formula V, wherein G1, G2, and R2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or phenyl group, by methods and conditions similar to those described in scheme 1, for the conversion of compounds of formula V to compounds of formula VI.
Alternatively compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above
Compounds of formula XV, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, can be prepared from compounds of formula XIV, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, and R is C1-C6alkyl, benzyl or phenyl, by a hydrolysis reaction and a subsequent cyclization reaction, as described in scheme 1 for the conversion of compounds of formula X to compounds of formula I.
Compounds of formula XIV, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are defined as under formula I above, and R is C1-C6alkyl, benzyl or phenyl, can be prepared by reacting compounds of formula XIII, wherein R2, G1, G2 are as described in formula I above, and R is C1-C6alkyl, benzyl or phenyl, with compounds of formula IX, wherein R1, X, R3, R4, R5, is as defined in formula I above, under amidation reaction conditions already described in scheme 1.
Compounds of formula XIII, wherein R2, G1, G2 are as described in formula I above, and R is C1-C6alkyl, benzyl or phenyl, can be prepared by benzylic oxidation of compounds of formula V, wherein R2, G1, G2 are as described in formula I above, and R is C1-C6alkyl, benzyl or phenyl. The reaction can be carried out in the presence of oxidative reagents such as KMNO4, nBu4MnO4, or K2S2O8, in the presence of oxygen, or under photochemical conditions in the presence of oxygen, and at temperature ranging from 20° C. to the boiling point of the reaction mixture. The reaction is carried out in the presence of inert solvent such as acetonitrile, ethyl acetate, DMSO, dichloroethane. Such reactions are known in the literature, for example in Synthesis 2017, 49:4007-4016, Synthesis 2006, 1757-1759 and IOSR Journal of Applied Chemistry 2014, 7:16-27.
Alternatively, compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I above,
Compounds of formula XVII, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I above, and R is C1-C6alkyl, benzyl or phenyl, can be prepared by reacting compounds of formula XVI, wherein R2, G1 and G2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or phenyl, with compounds of formula IX, wherein R1, X, R3, R4, R5, and R6 are as defined in formula I above, under Mitsunobu conditions. Such reactions are well known to those skilled in the art, and can be carried out in the presence of a phosphine reagent, such as triphenylphosphine, tributylphosphine, or polymer supported triphenyl phosphine amongst others, and in the presence of an azodicarboxylate reagent, such as diethyl azodicarboxylate, diisopropyl azodicarboxylate, and at temperature ranging from 0° C. and 100° C., and in the presence of inert solvent such as acetonitrile, dichloromethane, tetrahydrofuran, or toluene. Such reactions are reported for example in Synthesis 1981(1):1-28.
Compounds of formula XVI, wherein R2, G1 and G2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or phenyl, can be prepared by reacting compounds of formula XIII, wherein R2, G1 and G2 are as defined in formula I above, and R is C1-C6alkyl, benzyl or phenyl with reducing agents, such as, for example, metal hydrides like lithium aluminumhydride, DIBAL-H, or boranes (such as diborane, borane tetrahydrofuran amongst others), at temperatures ranging from 0° C. and 150° C., and in the presence of an inert solvent, such as tetrahydrofuran or dioxane. Such reactions have been reported, for example, in Tetrahedron Letters 1982, 23:2475-2478.
The compounds of formula XVII-1
Compounds of formula IX, wherein R1, X, R3, R4, R5, and R6 are as defined in formula I above, can be prepared
Compounds of formula IX, wherein R1, X, R3, R4, R5, and R6 are as defined in formula I above, may be prepared by the reaction of compounds of formula XVIII, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, with an organo-azide, in the presence of a suitable base and tert-butanol t-BuOH, in the presence of a coupling agent, optionally in the presence of a Lewis acid, and in the presence of an inert solvent, at temperatures between 50° C. and the boiling point of the reaction mixture. The reaction can be carried out in the presence of a coupling agent such as T3P, or via activation of the carboxylic acid with SOCl2 or oxalyl chloride, or other coupling agent as described in scheme 2 for the conversion of compounds of formula X into compounds of formula Xa. Examples of an organo-azide include TMSN3, sodium azide, or tosyl azide, and a suitable solvent may be toluene, xylene, THE or acetonitrile. Examples of a suitable Lewis acid may include Zn(OTf)2, Sc(OTf)2, or Cu(OTf)2 amongst others.
Compounds of formula XIX can also be prepared by reacting compounds of formula XVIII with diphenylphosphorylazide, in the presence of an organic base, such as triethylamine or diisopropylethylamine amongst others, and in the presence of tert-butanol t-BuOH and an inert solvent, for example a halogenated solvent such as dichloromethane, dichloroethane, or cyclic ethers such as tetrahydrofuran amongst others, and at temperatures ranging from 50° C. to the boiling point of the reaction mixture. Such reactions of converting carboxylic acids to BOC protected amines are well known to those skilled in the art by the name of Curtius reaction, and are reported, for example, in Org. Lett. 2005, 7:4107-4110; J. Med. Chem 2006, 49(12):3614-3627; J. Am. Chem. Soc. 1972, 94(17):6203-6205.
Compounds of formula IX, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, may also be prepared from compounds of formula XX, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, by a Hofmann-rearrangement reaction. The reaction can be carried out in the presence of a base, for example metal hydroxides, such as aqueous sodium hydroxide or potassium hydroxide, or organic bases such as DBU (1,8-diazabicyclo(5.4.0)undec-7-ene), and in the presence of electrophilic halogenating reagents, such as chlorine, bromine or N-bromosuccinimide, and at temperatures ranging from 20° C. to the boiling point of the reaction mixture. Such reactions are known by the name of Hofmann-rearrangement and are reported in literature, for example in Chem. Ber. 1881, 14:2725.
Compounds of formula XX, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, can be prepared by the reaction of compounds of formula XVIII, wherein R1, X, R3, R4, R5, and R6 is as defined in formula I above, with ammonia, for example NH4OH, NH3, or other ammonia surrogates, in the presence of a carboxylic acid activating agent as described in scheme 2 above.
The compounds of formula XIX
The compounds of formula IX
Compounds of formula XVIII, wherein R1, X, R3, R4, R5, and R6 are as defined in formula I, are either known in the literature, or they can be prepared by following scheme 8 using analogous methods and conditions as described in literature, for example, WO2019162174 A1.
Alternatively compounds of formula XVIII, wherein R1, X, R3, R4, R5, and R6 are as defined in formula I, can be prepared by following scheme 9 using analogous methods and conditions as described in literature, for example, WO2009095253 A1.
Compounds of formula IX, wherein R1, R3 and R4 are as defined in formula I and X is SO2 can alternatively be prepared following scheme 9a.
In scheme 9a compounds of formula IX, wherein R3, R4, and R1 are as defined in formula I, and X is SO2 can be prepared from compounds of formula XIX, wherein R3, R4, and R1 are as defined in formula I, and X is SO2 via deprotection of tert-butoxycarbonyl group. Such reactions can be carried out in the presence of acids such as trifluoroacetic acid, hydrocholoric acid amongst others and optionally in the presence of a solvent such as dichloromethane, toluene, or trifluorotoluene amongst others. Compounds of formula XIX, wherein R3, R4, and R1 are as defined in formula I, and X is SO2 can be prepared via oxidation of compounds of formula XIX, wherein R3, R4, and R1 are as defined in formula I, and X is S by following procedure analogous to as described above for the preparation of compounds of formula I using an oxidant, for example m-chloroperoxybenzoic acid (mCPBA), hydrogen peroxide, oxone, sodium periodate, sodium hypochlorite or tert-butyl hypochlorite amongst other oxidants. Compounds of formula XIX, wherein R3, R4, and R1 are as defined in formula I, and X is S can be prepared by the substitution reaction or by cross-coupling reaction of compounds of formula XXXIX, wherein R3, and R4, are as defined in formula I, PG1 is an amino protecting group for example acetyl, benzyl, benzoyl and LG6 is a leaving group preferably Cl, Br or I with a reagent of the formula XXXXa
R1—SH (XXXXa),
R1—S-M (XXXXb),
Alternatively, this reaction to form compounds of formula XXXXI from compounds of formula XXXIX using R1—SH (XXXXa) or R1-SM (XXXXb) can be carried out in the presence of a palladium catalyst, such as tris(dibenzylideneacetone)dipalladium(0), in the presence of a phosphine ligand, such as xanthphos, in the presence of a base such as N,N-diisopropylethylamine, and in the presence of an inert solvent, for example, xylene at temperatures between 100-160° C., preferably 140° C., as described in Tetrahedron 2005, 61, 5253-5259. During the conversion of compounds of formula XXXIX to compounds of formula XXXXI, amino protecting group PG1 is either cleaved under the reaction conditions described above or can be subsequently cleaved using suitable reagent well known to those skilled in the state of art for example acetyl protecting group can be cleaved under basic conditions using NaOH, KOH, Cs2CO3, K2CO3 amongst other bases.
Compounds of formula XXXIX, wherein R3, and R4, are as defined in formula I, PG1 is an amino protecting group for example acetyl, benzyl, benzoyl and LGs is a leaving group preferably Cl, Br or I can be prepared by the reaction of compounds of formula XXXVIII, wherein R3, and R4, are as defined in formula I, PG1 is an amino protecting group for example acetyl, benzyl, benzoyl and LGs is a leaving group preferably Cl, Br or I and di-tert-butyl decarbonate optionally in the presence of a base such as triethyl amine, 4-dimethylaminopyridine amongst others and in the presence of a solvent such as dichloromethane, acetonitrile, toluene, tetrahydrofuran amongst others. Compounds of formula XXXVIII, wherein R3, and R4, are as defined in formula I, PG1 is an amino protecting group for example acetyl, benzyl, benzoyl and LGs is a leaving group preferably Cl, Br or I can be prepared by reacting compounds of formula XXXVII, wherein R3, and R4, are as defined in formula I, and PG1 is an amino protecting group for example acetyl, benzyl, benzoyl with a suitable halogenating reagent such as N-Chlorosuccinimide, N-Bromosuccinimide, N-lodosuccinimide amongst others in the presence of solvent such as dichloromethane, acetonitrile, tetrahydrofuran, DMF amongst others. Such reactions are well known to those skilled in the state of art. Compounds of formula XXXVII, wherein R3, and R4, are as defined in formula I, and PG1 is an amino protecting group for example acetyl, benzyl, benzoyl can be prepared by reacting compounds of formula XXXVI, wherein R3, and R4, are as defined in formula I with a suitable amino protecting group reagent for example using acetyl chloride in the presence of pyridine.
Compounds of formula XXXVI, wherein R3, and R4, are as defined in formula I can be prepared in two steps from compounds of formula XXXIV, wherein R3, and R4, are as defined in formula I, which involves N-amination reaction of compounds of formula XXXIV with aminating reagent such as hydroxylamine-O-sulfonic acid, O-(mesitylsulfonyl)hydroxylamine amongst others to form compounds of formula XXXV, wherein R3, and R4, are as defined in formula I, followed by intramolecular cyclization of compounds of formula XXXV, wherein R3, and R4, are as defined in formula I, in the presence of a base such as sodium hydride, KOH, NaOH, potassium carbonate, cesium carbonate amongst others and in the presence of a solvent such as dichloromethane, dichloroethane, methanol, tetrahydrofuran, dimethylformamide amongst others. Such two step reactions are reported in literature for example as described in Tetrahedron Letters (2014), 55(43), 5963-5966.
Compounds of formula XXXIV, wherein R3, and R4, are as defined in formula I, can be prepared from compounds of formula XXXIII-a1, wherein R3, and R4, are as defined in formula I, and LGs is a halogen (or a pseudo-halogen leaving group, such as a triflate), on reaction with a acetonitrile anion equivalents in the presence of metal catalysts. A variety of acetonitrile anion equivalents can be used in such reactions. Examples of such are tri-nbutylstannylacetonitrile, which can be coupled to compounds of formula (XXXIII-a1) under Stille reaction conditions as described by Mitiga ef. al. (Chem. Lett. 1984, 15 11), ortrimethylsilylacetonitrile in the presence of a palladium catalyst, such as tris(dibenzylideneacetone)dipalladium(0), XantPhos Pd G3 ([(4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate) and a ligand, for example Xantphos or P(i-Bu)3, a fluoride source, for example ZnF2, in a dipolar aprotic solvent such as DMF, at temperatures between 80-120° C. Such reactions are well precedented in the literature, for example see Hartwig ef. al. (J. Am. Chem. Soc. 2002, 124, 9330, and J. Am. Chem. Soc. 2005, 727, 15824) (scheme 9a). Metal cyanoacetate such as potassium cyanoacetate or sodium cyanoacetate can also be used as an acetonitrile anion equivalent and undergo coupling reaction in the presence of palladium catalyst such as [Pd2(dba)3] (Tris(dibenzylideneacetone)dipalladium(0)), [Pd(allyl)Cl]2 (Allylpalladium(II) chloride dimer) amongst others in the presence of a ligand such as SPhos, Xantphos or P(i-Bu)3 or P(tert-butyl)3 amongst others. Such reactions are known in the literature and described for example in Angew. Chem. Int. Ed. 2011, 50, 4470-4474.
Yet another method to prepare compounds of formula XXXIV from compounds of formula XXXIII-a1 is shown below (scheme 9a-1).
Reaction of compounds of formula XXXIII-a1, wherein wherein R3, and R4, are as defined in formula I, and LGs is a halogen (or a pseudo-halogen leaving group, such as a triflate), with reagents of the formula XXXIII-a2, wherein R is C1-C6alkyl, in the presence of a base, such as sodium carbonate, potassium carbonate or cesium carbonate, or sodium hydride, sodium methoxide or ethoxide, potassium tert-butoxide, optionally under palladium (for example involving Pd(PPh3)2Cl2) or copper (for example involving CuI) catalysis, in a appropriate solvent such as for example toluene, dioxane, tetrahydrofuran, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone NMP or dimethylsulfoxide DMSO, optionally in presence of a phase transfer catalyst PTC, such as for example tetrabutyl ammonium bromide or triethyl benzyl ammonium chloride TEBAC, at temperatures between room temperature and 180° C., may lead to compounds of formula XXXIII, wherein R3 and R4 are as described under formula I above, and in which R is C1-C6alkyl. Similar chemistry has been described in, for example, Synthesis 2010, No. 19, 3332-3338.
Compounds of formula XXXIV, wherein R3, and R4 are as described under formula I above, may be prepared by saponification/decarboxylation of the compounds of formula XXXIII, wherein R3 and R4 are as described under formula I above, and in which R is C1-C6alkyl, under conditions known to a person skilled in the art (using for example conditions such as: aqueous sodium, potassium or lithium hydroxide in methanol, ethanol, tetrahydrofuran or dioxane at room temperature, or up to refluxing conditions; followed by acidification of the reaction mixture under standard aqueous acid conditions or for example under acidic conditions in the presence of HCl or para-toluene sulfonic acid). Alternatively, treating compounds of formula XXXIII with halide anions, preferably chloride anions, originating from, for example, lithium chloride or sodium chloride, in solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone or dimethylsulfoxide DMSO, optionally in presence of additional water, may also generate the compounds of formula XXXIV. The reaction temperature for such a transformation (Krapcho O-dealkylation/decarboxylation) range preferentially from 20° C. to the boiling point of the reaction mixture, or the reaction may be performed under microwave irradiation. Similar chemistry has been described in, for example, Synthesis 2010, No. 19, 3332-3338.
Alternatively compounds of formula IX, wherein R3, R4, and R1 are as defined in formula I, and X is SO2 can be prepared following scheme 9b. In scheme 9b, compounds of formula IX, wherein R3, R4, and R1 are as defined in formula I, and X is SO2 can be prepared from compounds of formula XXXXIII, wherein R3 and R4 are as defined in formula I, following procedure analogous to as described in scheme 9a for the conversion of compounds of formula XXXVII to compounds of formula IX.
Compounds of formula XXXXIII, wherein R3 and R4 are as defined in formula I, can be prepared from compounds of formula XXXIV, wherein R3 and R4 are as defined in formula I, via four step procedure which involves reaction with hydroxylamine to form compounds of formula XXXXII, acetylation reaction to form compounds of formula XXXXIIa, base catalyzed oxadiazole synthesis to form compounds of formula XXXXIIb and finally intramolecular cyclization/rearrangement to form compounds of formula XXXXIII. Such reactions have been reported in the literature for example described in WO2012146657, WO2012146659 or Tetrahedron Letters (2017), 58(3), 202-205. Compounds of formula XXXIV can be prepared from compounds of formula XXXIII-a1 as described in scheme 9a.
Alternatively compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I above, can be prepared following scheme 10.
In the particular situation within scheme 10 when R3 is —N(R5)COR6, wherein R5 and R6 are as defined in formula I, then compounds of formula I, wherein X is SO or SO2, may be prepared from compounds of formula XXXa-1, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I, and in which X is SO or SO2, and wherein Xb is a leaving group like, for example, chlorine, bromine or iodine (preferably chlorine or bromine), or an aryl- or alkylsulfonate such as trifluoromethanesulfonate, by reaction (C—N bond formation) with a reagent R3—H (XXXIa) equivalent to HN(R5)COR6, wherein R5 and R6 are as defined in formula I. Such a reaction is performed in the presence of a base, such as potassium carbonate, cesium carbonate, sodium hydroxide, in an inert solvent, such as toluene, dimethylformamide DMF, N-methyl pyrrolidine NMP, dimethyl sulfoxide DMSO, dioxane, tetrahydrofuran THF, and the like, optionally in the presence of a catalyst, for example palladium(II)acetate, bis(dibenzylideneacetone)palladium(0) (Pd(dba)2) or tris(dibenzylideneacetone)dipalladium(0) (Pd2(dba)3, optionally in form of a chloroform adduct), or a palladium pre-catalyst such as for example tert-BuBrettPhos Pd G3 [(2-Di-tert-butylphosphino-3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate or BrettPhos Pd G3 [(2-di-cyclohexylphosphino-3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate, and optionally in the presence of a ligand, for example SPhos, t-BuBrettPhos or Xantphos, at temperatures between 60-120° C., optionally under microwave irradiation.
In the particular situation within scheme 10 when R3 is —N(R5R6), wherein R5 and R6 are as defined in formula I, then compounds of formula I, wherein X is SO or SO2, may be prepared from compounds of formula XXXa-1, wherein R1, R2, G1, G2 and R4 are as defined in formula I, and in which X is SO or SO2, and wherein Xb is a leaving group like, for example, chlorine, bromine or iodine (preferably chlorine or bromine), or an aryl- or alkylsulfonate such as trifluoromethanesulfonate, by reaction (C—N bond formation) with a reagent R3-H (XXXIa) equivalent to HN(R5R6), or a salt thereof (such as a hydrohalide salt, preferably a hydrochloride or a hydrobromide salt, or a trifluoroacetic acid salt, or any other equivalent salt), wherein R7 is as defined in formula I. Such a reaction is commonly performed in an inert solvent such as alcohols, amides, esters, ethers, nitriles and water, particularly preferred are methanol, ethanol, 2,2,2-trifluoroethanol, propanol, isopropanol, N,N-dimethylformamide, N,N-dimethylacetamide, dioxane, tetrahydrofuran, dimethoxyethane, acetonitrile, ethyl acetate, toluene, water or mixtures thereof, at temperatures between 0-150° C., optionally under microwave irradiation or pressurized conditions using an autoclave, optionally in the presence of a copper catalyst, such as copper powder, copper(I) iodide or copper sulfate (optionally in form of a hydrate), or mixtures thereof, optionally in presence a ligand, for example diamine ligands (e.g. N,N′-dimethylethylenediamine or trans-cyclohexyldiamine) or dibenzylideneacetone (dba), or 1,10-phenanthroline, and optionally in presence of a base such as potassium phosphate.
Reagents HN(R5R6) or HN(R5)COR6, wherein R5 and R6 are as defined in formula I, are either known, commercially available or may be prepared by methods known to a person skilled in the art.
Alternatively, compounds of formula I, wherein X is SO or SO2, may be prepared by a Suzuki reaction, which involves for example, reacting compounds of formula XXXa-1, wherein R1, R2, G1, G2 and R3 are as defined in formula I, and in which X is SO or SO2, and wherein Xb is a leaving group like, for example, chlorine, bromine or iodine (preferably chlorine or bromine), or an aryl- or alkylsulfonate such as trifluoromethanesulfonate, with compounds of formula (XXXI), wherein R3 is as defined in formula I, and wherein Yb1 can be a boron-derived functional group, such as for example B(OH)2 or B(ORb1)2 wherein Rb1 can be a C1-C4alkyl group or the two groups ORb1 can form together with the boron atom a five membered ring, as for example a pinacol boronic ester. The reaction may be catalyzed by a palladium based catalyst, for example tetrakis(triphenyl-phosphine)palladium(0), (1,1′bis(diphenylphosphino)ferrocene)dichloro-palladium-dichloromethane (1:1 complex) or chloro(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) (XPhos palladacycle), in presence of a base, like sodium carbonate, tripotassium phosphate or cesium fluoride, in a solvent or a solvent mixture, like, for example dioxane, acetonitrile, N,N-dimethyl-formamide, a mixture of 1,2-dimethoxyethane and water or of dioxane/water, or of toluene/water, preferably under inert atmosphere. The reaction temperature can preferentially range from room temperature to the boiling point of the reaction mixture, or the reaction may be performed under microwave irradiation. Such Suzuki reactions are well known to those skilled in the art and have been reviewed, for example, in J. Organomet. Chem. 576, 1999, 147-168.
Oxidation of compounds of formula XXXa-1, wherein R1, R2, G1, G2 and R4 are as defined in formula I, and in which X is S, and wherein Xb is a leaving group like, for example, chlorine, bromine or iodine (preferably chlorine or bromine), or an aryl- or alkylsulfonate such as trifluoromethanesulfonate, with a suitable oxidizing agent, into compounds of formula XXIXa-1, wherein X is SO or SO2 may be achieved under conditions already described above.
A large number of compounds of the formula (XXXI), and (XXXIa) are commercially available or can be prepared by those skilled in the art.
Alternatively, compounds of formula I, wherein X is SO or SO2, may be prepared from compounds of formula XXIXa-1, wherein X is S (sulfide) by involving the same chemistry as described above, but by changing the order of the steps (i.e. by running the sequence XXIXa-1 (X is S) to I (X is S) via Suzuki, or C—N bond formation, followed by an oxidation step to form I (X is SO or SO2).
Alternatively compounds of formula I, wherein R1, R2, G1, G2, X, R3, R4, R5, and R6 are as defined in formula I above, may be prepared following scheme 11.
The chemistry described previously in scheme 10 to access compounds of formula I from compounds of formula XXIXa-1, can be applied analogously (scheme 11) for the preparation of compounds of formula I from compounds of formula XXIXa-2, wherein all substituent definitions mentioned previously remain valid.
The reactants can be reacted in the presence of a base. Examples of suitable bases are alkali metal or alkaline earth metal hydroxides, alkali metal or alkaline earth metal hydrides, alkali metal or alkaline earth metal amides, alkali metal or alkaline earth metal alkoxides, alkali metal or alkaline earth metal acetates, alkali metal or alkaline earth metal carbonates, alkali metal or alkaline earth metal dialkylamides or alkali metal or alkaline earth metal alkylsilylamides, alkylamines, alkylenediamines, free or N-alkylated saturated or unsaturated cycloalkylamines, basic heterocycles, ammonium hydroxides and carbocyclic amines. Examples which may be mentioned are sodium hydroxide, sodium hydride, sodium amide, sodium methoxide, sodium acetate, sodium carbonate, potassium tert-butoxide, potassium hydroxide, potassium carbonate, potassium hydride, lithium diisopropylamide, potassium bis(trimethylsilyl)amide, calcium hydride, triethylamine, diisopropylethylamine, triethylenediamine, cyclohexylamine, N-cyclohexyl-N,N-dimethylamine, N,N-diethylaniline, pyridine, 4-(N,N-dimethylamino)pyridine, quinuclidine, N-methylmorpholine, benzyltrimethylammonium hydroxide and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
The reactants can be reacted with each other as such, i.e. without adding a solvent or diluent. In most cases, however, it is advantageous to add an inert solvent or diluent or a mixture of these. If the reaction is carried out in the presence of a base, bases which are employed in excess, such as triethylamine, pyridine, N-methylmorpholine or N,N-diethylaniline, may also act as solvents or diluents.
The reactions are advantageously carried out in a temperature range from approximately −80° C. to approximately +140° C., preferably from approximately −30° C. to approximately +100° C., in many cases in the range between ambient temperature and approximately +80° C.
A compound of formula I can be converted in a manner known per se into another compound of formula I by replacing one or more substituents of the starting compound of formula I in the customary manner by (an)other substituent(s) according to the invention, and by post modification of compounds of with reactions such as oxidation, alkylation, reduction, acylation and other methods known by those skilled in the art.
Depending on the choice of the reaction conditions and starting materials which are suitable in each case, it is possible, for example, in one reaction step only to replace one substituent by another substituent according to the invention, or a plurality of substituents can be replaced by other substituents according to the invention in the same reaction step.
Salts of compounds of formula I can be prepared in a manner known per se. Thus, for example, acid addition salts of compounds of formula I are obtained by treatment with a suitable acid or a suitable ion exchanger reagent and salts with bases are obtained by treatment with a suitable base or with a suitable ion exchanger reagent.
Salts of compounds of formula I can be converted in the customary manner into the free compounds I, acid addition salts, for example, by treatment with a suitable basic compound or with a suitable ion exchanger reagent and salts with bases, for example, by treatment with a suitable acid or with a suitable ion exchanger reagent.
Salts of compounds of formula I can be converted in a manner known per se into other salts of compounds of formula I, acid addition salts, for example, into other acid addition salts, for example by treatment of a salt of inorganic acid such as hydrochloride with a suitable metal salt such as a sodium, barium or silver salt, of an acid, for example with silver acetate, in a suitable solvent in which an inorganic salt which forms, for example silver chloride, is insoluble and thus precipitates from the reaction mixture.
Depending on the procedure or the reaction conditions, the compounds of formula I, which have salt-forming properties can be obtained in free form or in the form of salts.
The compounds of formula I and, where appropriate, the tautomers thereof, in each case in free form or in salt form, can be present in the form of one of the isomers which are possible or as a mixture of these, for example in the form of pure isomers, such as antipodes and/or diastereomers, or as isomer mixtures, such as enantiomer mixtures, for example racemates, diastereomer mixtures or racemate mixtures, depending on the number, absolute and relative configuration of asymmetric carbon atoms which occur in the molecule and/or depending on the configuration of non-aromatic double bonds which occur in the molecule; the invention relates to the pure isomers and also to all isomer mixtures which are possible and is to be understood in each case in this sense hereinabove and hereinbelow, even when stereochemical details are not mentioned specifically in each case.
Diastereomer mixtures or racemate mixtures of compounds of formula I, in free form or in salt form, which can be obtained depending on which starting materials and procedures have been chosen can be separated in a known manner into the pure diasteromers or racemates on the basis of the physicochemical differences of the components, for example by fractional crystallization, distillation and/or chromatography.
Enantiomer mixtures, such as racemates, which can be obtained in a similar manner can be resolved into the optical antipodes by known methods, for example by recrystallization from an optically active solvent, by chromatography on chiral adsorbents, for example high-performance liquid chromatography (HPLC) on acetyl cellulose, with the aid of suitable microorganisms, by cleavage with specific, immobilized enzymes, via the formation of inclusion compounds, for example using chiral crown ethers, where only one enantiomer is complexed, or by conversion into diastereomeric salts, for example by reacting a basic end-product racemate with an optically active acid, such as a carboxylic acid, for example camphor, tartaric or malic acid, or sulfonic acid, for example camphorsulfonic acid, and separating the diastereomer mixture which can be obtained in this manner, for example by fractional crystallization based on their differing solubilities, to give the diastereomers, from which the desired enantiomer can be set free by the action of suitable agents, for example basic agents.
Pure diastereomers or enantiomers can be obtained according to the invention not only by separating suitable isomer mixtures, but also by generally known methods of diastereoselective or enantioselective synthesis, for example by carrying out the process according to the invention with starting materials of a suitable stereochemistry.
N-oxides can be prepared by reacting a compound of the formula I with a suitable oxidizing agent, for example the H2O2/urea adduct in the presence of an acid anhydride, e.g. trifluoroacetic anhydride. Such oxidations are known from the literature, for example from J. Med. Chem., 32 (12), 2561-73, 1989 or WO 2000/15615.
It is advantageous to isolate or synthesize in each case the biologically more effective isomer, for example enantiomer or diastereomer, or isomer mixture, for example enantiomer mixture or diastereomer mixture, if the individual components have a different biological activity.
The compounds of formula I and, where appropriate, the tautomers thereof, in each case in free form or in salt form, can, if appropriate, also be obtained in the form of hydrates and/or include other solvents, for example those which may have been used for the crystallization of compounds which are present in solid form.
The compounds of formula I according to the following Tables A-1 to A-12, B-1 to B-12, C-1 to C-15, and D-1 to D-15 can be prepared according to the methods described above. The examples which follow are intended to illustrate the invention and show preferred compounds of formula I, in the form of a compound of formula Ia-Qa to Id-Qa.
The tables below illustrate specific compounds of the invention.
The tables A-1 to A-12 below illustrate specific compound of the invention.
Table A-1 provides 14 compounds A-1.001 to A-1.014 of formula Ia-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is S and R3 is as defined in table Y.
Table A-2 provides 14 compounds A-2.001 to A-2.014 of formula Ia-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table A-3 provides 14 compounds A-3.001 to A-3.014 of formula Ia-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table A-4 provides 14 compounds A-4.001 to A-4.014 of formula Ia-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is S and R3 is as defined in table Y.
Table A-5 provides 14 compounds A-5.001 to A-5.014 of formula Ia-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table A-6 provides 14 compounds A-6.001 to A-6.014 of formula Ia-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table A-7 provides 14 compounds A-7.001 to A-7.014 of formula Ia-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is S and R3 is as defined in table Y.
Table A-8 provides 14 compounds A-8.001 to A-8.014 of formula Ia-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table A-9 provides 14 compounds A-9.001 to A-9.014 of formula Ia-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table A-10 provides 14 compounds A-10.001 to A-10.014 of formula Ia-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is S and R3 is as defined in table Y.
Table A-11 provides 14 compounds A-11.001 to A-11.014 of formula Ia-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table A-12 provides 14 compounds A-12.001 to A-12.014 of formula Ia-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
The tables B-1 to B-12 below illustrate further specific compound of the invention.
Table B-1 provides 14 compounds B-1.001 to B-1.014 of formula Ib-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is S and R4 is as defined in table Z.
Table B-2 provides 14 compounds B-2.001 to B-2.014 of formula Ib-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is SO and R4 is as defined in table Z.
Table B-3 provides 14 compounds B-3.001 to B-3.014 of formula Ib-Qa wherein G1 is N, G2 is N, R1 is ethyl, X is SO2 and R4 is as defined in table Z.
Table B-4 provides 14 compounds B-4.001 to B-4.014 of formula Ib-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is S and R4 is as defined in table Z.
Table B-5 provides 14 compounds B-5.001 to B-5.014 of formula Ib-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is SO and R4 is as defined in table Z.
Table B-6 provides 14 compounds B-6.001 to B-6.014 of formula Ib-Qa wherein G1 is N, G2 is CH, R1 is ethyl, X is SO2 and R4 is as defined in table Z.
Table B-7 provides 14 compounds B-7.001 to B-7.014 of formula Ib-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is S and R4 is as defined in table Z.
Table B-8 provides 14 compounds B-8.001 to B-8.014 of formula Ib-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is SO and R4 is as defined in table Z.
Table B-9 provides 14 compounds B-9.001 to B-9.014 of formula Ib-Qa wherein G1 is CH, G2 is N, R1 is ethyl, X is SO2 and R4 is as defined in table Z.
Table B-10 provides 14 compounds B-10.001 to B-10.014 of formula Ia-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is S and R4 is as defined in table Z.
Table B-11 provides 14 compounds B-11.001 to B-11.014 of formula Ib-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is SO and R4 is as defined in table Z.
Table B-12 provides 14 compounds B-12.001 to B-12.014 of formula Ib-Qa wherein G1 is CH, G2 is CH, R1 is ethyl, X is SO2 and R4 is as defined in table Z.
The tables C-1 to C-15 below illustrate further specific compound of the invention.
Table C-1 provides 14 compounds C-1.001 to C-1.014 of formula Ic-Qa wherein R2 is SCF3, R1 is ethyl, X is S and R3 is as defined in table Y.
Table C-2 provides 14 compounds C-2.001 to C-2.014 of formula Ic-Qa wherein R2 is SCF3, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table C-3 provides 14 compounds C-3.001 to C-3.014 of formula Ic-Qa wherein R2 is SCF3, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table C-4 provides 14 compounds C-4.001 to C-4.014 of formula Ic-Qa wherein R2 is SOCF3, R1 is ethyl, X is S and R3 is as defined in table Y.
Table C-5 provides 14 compounds C-5.001 to C-5.014 of formula Ic-Qa wherein R2 is SOCF3, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table C-6 provides 14 compounds C-6.001 to C-6.014 of formula Ic-Qa wherein R2 is SOCF3, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table C-7 provides 14 compounds C-7.001 to C-7.014 of formula Ic-Qa wherein R2 is SO2CF3, R1 is ethyl, X is S and R3 is as defined in table Y.
Table C-8 provides 14 compounds C-8.001 to C-8.014 of formula Ic-Qa wherein R2 is SO2CF3, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table C-9 provides 14 compounds C-9.001 to C-9.014 of formula Ic-Qa wherein R2 is SO2CF3, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table C-10 provides 14 compounds C-10.001 to C-10.014 of formula Ic-Qa wherein R2 is OSO2CF3, R1 is ethyl, X is S and R3 is as defined in table Y.
Table C-11 provides 14 compounds C-11.001 to C-11.014 of formula Ic-Qa wherein R2 is OSO2CF3, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table C-12 provides 14 compounds C-12.001 to C-12.014 of formula Ic-Qa wherein R2 is OSO2CF3, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
Table C-13 provides 14 compounds C-13.001 to C-13.014 of formula Ic-Qa wherein R2 is OCF3, R1 is ethyl, X is S and R3 is as defined in table Y.
Table C-14 provides 14 compounds C-14.001 to C-14.014 of formula Ic-Qa wherein R2 is OCF3, R1 is ethyl, X is SO and R3 is as defined in table Y.
Table C-15 provides 14 compounds C-15.001 to C-15.014 of formula Ic-Qa wherein R2 is OCF3, R1 is ethyl, X is SO2 and R3 is as defined in table Y.
The tables D-1 to D-15 below illustrate further specific compound of the invention.
Table D-1 provides 14 compounds D-1.001 to D-1.014 of formula Id-Qa wherein R1 is ethyl, X is S, R2 is SCF3 and R4 is as defined in table Z.
Table D-2 provides 14 compounds D-2.001 to D-2.014 of formula Id-Qa wherein R1 is ethyl, X is S, R2 is SOCF3 and R4 is as defined in table Z.
Table D-3 provides 14 compounds D-3.001 to D-3.014 of formula Id-Qa wherein R1 is ethyl, X is S, R2 is SO2CF3 and R4 is as defined in table Z.
Table D-4 provides 14 compounds D-4.001 to D-4.014 of formula Id-Qa wherein R1 is ethyl, X is S, R2 is OSO2CF3 and R4 is as defined in table Z.
Table D-5 provides 14 compounds D-5.001 to D-5.014 of formula Id-Qa wherein R1 is ethyl, X is S, R2 is OCF3 and R4 is as defined in table Z.
Table D-6 provides 14 compounds D-6.001 to D-6.014 of formula Id-Qa wherein R1 is ethyl, X is SO, R2 is SCF3 and R4 is as defined in table Z.
Table D-7 provides 14 compounds D-7.001 to D-7.014 of formula Id-Qa wherein R1 is ethyl, X is SO, R2 is SOCF3 and R4 is as defined in table Z.
Table D-8 provides 14 compounds D-8.001 to D-8.014 of formula Id-Qa wherein R1 is ethyl, X is SO, R2 is SO2CF3 and R4 is as defined in table Z.
Table D-9 provides 14 compounds D-9.001 to D-9.014 of formula Id-Qa wherein R1 is ethyl, X is SO, R2 is OSO2CF3 and R4 is as defined in table Z.
Table D-10 provides 14 compounds D-10.001 to D-10.014 of formula Id-Qa wherein R1 is ethyl, X is SO, R2 is OCF3 and R4 is as defined in table Z.
Table D-11 provides 14 compounds D-11.001 to D-11.014 of formula Id-Qa wherein R1 is ethyl, X is SO2, R2 is SCF3 and R4 is as defined in table Z.
Table D-12 provides 14 compounds D-12.001 to D-12.014 of formula Id-Qa wherein R1 is ethyl, X is SO2, R2 is SOCF3 and R4 is as defined in table Z.
Table D-13 provides 14 compounds D-13.001 to D-13.014 of formula Id-Qa wherein R1 is ethyl, X is SO2, R2 is SO2CF3 and R4 is as defined in table Z.
Table D-14 provides 14 compounds D-14.001 to D-14.014 of formula Id-Qa wherein R1 is ethyl, X is SO2, R2 is OSO2CF3 and R4 is as defined in table Z.
Table D-15 provides 14 compounds D-15.001 to D-15.014 of formula Id-Qa wherein R1 is ethyl, X is SO2, R2 is OCF3 and R4 is as defined in table Z.
The compounds of formula I according to the invention are preventively and/or curatively valuable active ingredients in the field of pest control, even at low rates of application, which have a very favorable biocidal spectrum and are well tolerated by warm-blooded species, fish and plants. The active ingredients according to the invention act against all or individual developmental stages of normally sensitive, but also resistant, animal pests, such as insects or representatives of the order Acarina. The insecticidal or acaricidal activity of the active ingredients according to the invention can manifest itself directly, i. e. in destruction of the pests, which takes place either immediately or only after some time has elapsed, for example during ecdysis, or indirectly, for example in a reduced oviposition and/or hatching rate, a good activity corresponding to a destruction rate (mortality) of at least 50 to 60%.
Examples of the above-mentioned animal pests are:
The active ingredients according to the invention can be used for controlling, i. e. containing or destroying, pests of the abovementioned type which occur in particular on plants, especially on useful plants and ornamentals in agriculture, in horticulture and in forests, or on organs, such as fruits, flowers, foliage, stalks, tubers or roots, of such plants, and in some cases even plant organs which are formed at a later point in time remain protected against these pests.
Suitable target crops are, in particular, cereals, such as wheat, barley, rye, oats, rice, maize or sorghum; beet, such as sugar or fodder beet; fruit, for example pomaceous fruit, stone fruit or soft fruit, such as apples, pears, plums, peaches, almonds, cherries or berries, for example strawberries, raspberries or blackberries; leguminous crops, such as beans, lentils, peas or soya; oil crops, such as oilseed rape, mustard, poppies, olives, sunflowers, coconut, castor, cocoa or ground nuts; cucurbits, such as pumpkins, cucumbers or melons; fibre plants, such as cotton, flax, hemp orjute; citrus fruit, such as oranges, lemons, grapefruit or tangerines; vegetables, such as spinach, lettuce, asparagus, cabbages, carrots, onions, tomatoes, potatoes or bell peppers; Lauraceae, such as avocado, Cinnamonium or camphor; and also tobacco, nuts, coffee, eggplants, sugarcane, tea, pepper, grapevines, hops, the plantain family and latex plants.
The compositions and/or methods of the present invention may be also used on any ornamental and/or vegetable crops, including flowers, shrubs, broad-leaved trees and evergreens. For example the invention may be used on any of the following ornamental species: Ageratum spp., Alonsoa spp., Anemone spp., Anisodontea capsenisis, Anthemis spp., Antirrhinum spp., Aster spp., Begonia spp. (e.g. B. elatior, B. semperflorens, B. tubereux), Bougainvillea spp., Brachycome spp., Brassica spp. (ornamental), Calceolaria spp., Capsicum annuum, Catharanthus roseus, Canna spp., Centaurea spp., Chrysanthemum spp., Cineraria spp. (C. maritime), Coreopsis spp., Crassula coccinea, Cuphea ignea, Dahlia spp., Delphinium spp., Dicentra spectabilis, Dorotheantus spp., Eustoma grandiflorum, Forsythia spp., Fuchsia spp., Geranium gnaphalium, Gerbera spp., Gomphrena globosa, Heliotropium spp., Helianthus spp., Hibiscus spp., Hortensia spp., Hydrangea spp., Hypoestes phyllostachya, Impatiens spp. (I. Walleriana), Iresines spp., Kalanchoe spp., Lantana camara, Lavatera trimestris, Leonotis leonurus, Lilium spp., Mesembryanthemum spp., Mimulus spp., Monarda spp., Nemesia spp., Tagetes spp., Dianthus spp. (carnation), Canna spp., Oxalis spp., Bellis spp., Pelargonium spp. (P. peltatum, P. Zonale), Viola spp. (pansy), Petunia spp., Phlox spp., Plecthranthus spp., Poinsettia spp., Parthenocissus spp. (P. quinquefolia, P. tricuspidata), Primula spp., Ranunculus spp., Rhododendron spp., Rosa spp. (rose), Rudbeckia spp., Saintpaulia spp., Salvia spp., Scaevola aemola, Schizanthus wisetonensis, Sedum spp., Solanum spp., Surfinia spp., Tagetes spp., Nicotinia spp., Verbena spp., Zinnia spp. and other bedding plants.
For example the invention may be used on any of the following vegetable species: Allium spp. (A. sativum, A. cepa, A. oschaninii, A. Porrum, A. ascalonicum, A. fistulosum), Anthriscus cerefolium, Apium graveolus, Asparagus officinalis, Beta vulgarus, Brassica spp. (B. Oleracea, B. Pekinensis, B. rapa), Capsicum annuum, Cicer arietinum, Cichorium endivia, Cichorum spp. (C. intybus, C. endivia), Citrillus lanatus, Cucumis spp. (C. sativus, C. melo), Cucurbita spp. (C. pepo, C. maxima), Cyanara spp. (C. scolymus, C. cardunculus), Daucus carota, Foeniculum vulgare, Hypericum spp., Lactuca sativa, Lycopersicon spp. (L. esculentum, L. lycopersicum), Mentha spp., Ocimum basilicum, Petroselinum crispum, Phaseolus spp. (P. vulgaris, P. coccineus), Pisum sativum, Raphanus sativus, Rheum rhaponticum, Rosemarinus spp., Salvia spp., Scorzonera hispanica, Solanum melongena, Spinacea oleracea, Valerianella spp. (V. locusta, V. eriocarpa) and Vicia faba.
Preferred ornamental species include African violet, Begonia, Dahlia, Gerbera, Hydrangea, Verbena, Rosa, Kalanchoe, Poinsettia, Aster, Centaurea, Coreopsis, Delphinium, Monarda, Phlox, Rudbeckia, Sedum, Petunia, Viola, Impatiens, Geranium, Chrysanthemum, Ranunculus, Fuchsia, Salvia, Hortensia, rosemary, sage, St. Johnswort, mint, sweet pepper, tomato and cucumber.
The active ingredients according to the invention are especially suitable for controlling Aphis craccivora, Diabrotica balteata, Heliothis virescens, Myzus persicae, Plutella xylostella and Spodoptera littoralis in cotton, vegetable, maize, rice and soya crops. The active ingredients according to the invention are further especially suitable for controlling Mamestra (preferably in vegetables), Cydia pomonella (preferably in apples), Empoasca(preferably in vegetables, vineyards), Leptinotarsa (preferably in potatos) and Chilo supressalis (preferably in rice).
The active ingredients according to the invention are especially suitable for controlling Aphis craccivora, Diabrotica balteata, Heliothis virescens, Myzus persicae, Plutella xylostella and Spodoptera littoralis in cotton, vegetable, maize, rice and soya crops. The active ingredients according to the invention are further especially suitable for controlling Mamestra (preferably in vegetables), Cydia pomonella (preferably in apples), Empoasca(preferably in vegetables, vineyards), Leptinotarsa (preferably in potatos) and Chilo supressalis (preferably in rice).
In a further aspect, the invention may also relate to a method of controlling damage to plant and parts thereof by plant parasitic nematodes (Endoparasitic-, Semiendoparasitic- and Ectoparasitic nematodes), especially plant parasitic nematodes such as root knot nematodes, Meloidogyne hapla, Meloidogyne incognita, Meloidogyne javanica, Meloidogyne arenaria and other Meloidogyne species; cyst-forming nematodes, Globodera rostochiensis and other Globodera species; Heterodera avenae, Heterodera glycines, Heterodera schachtii, Heterodera trifolii, and other Heterodera species; Seed gall nematodes, Anguina species; Stem and foliar nematodes, Aphelenchoides species; Sting nematodes, Belonolaimus longicaudatus and other Belonolaimus species; Pine nematodes, Bursaphelenchus xylophilus and other Bursaphelenchus species; Ring nematodes, Criconema species, Criconemella species, Criconemoides species, Mesocriconema species; Stem and bulb nematodes, Ditylenchus destructor, Ditylenchus dipsaci and other Ditylenchus species; Awl nematodes, Dolichodorus species; Spiral nematodes, Heliocotylenchus multicinctus and other Helicotylenchus species; Sheath and sheathoid nematodes, Hemicycliophora species and Hemicriconemoides species; Hirshmanniella species; Lance nematodes, Hoploaimus species; false rootknot nematodes, Nacobbus species; Needle nematodes, Longidorus elongatus and other Longidorus species; Pin nematodes, Pratylenchus species; Lesion nematodes, Pratylenchus neglectus, Pratylenchus penetrans, Pratylenchus curvitatus, Pratylenchus goodeyi and other Pratylenchus species; Burrowing nematodes, Radopholus similis and other Radopholus species; Reniform nematodes, Rotylenchus robustus, Rotylenchus reniformis and other Rotylenchus species; Scutellonema species; Stubby root nematodes, Trichodorus primitivus and other Trichodorus species, Paratrichodorus species; Stunt nematodes, Tylenchorhynchus claytoni, Tylenchorhynchus dubius and other Tylenchorhynchus species; Citrus nematodes, Tylenchulus species; Dagger nematodes, Xiphinema species; and other plant parasitic nematode species, such as Subanguina spp., Hypsoperine spp., Macroposthonia spp., Melinius spp., Punctodera spp., and Quinisulcius spp.
The compounds of the invention may also have activity against the molluscs. Examples of which include, for example, Ampullariidae; Arion (A. ater, A. circumscriptus, A. hortensis, A. rufus); Bradybaenidae (Bradybaena fruticum); Cepaea (C. hortensis, C. Nemoralis); ochlodina; Deroceras (D. agrestis, D. empiricorum, D. laeve, D. reticulatum); Discus (D. rotundatus); Euomphalia; Galba (G. trunculata); Helicelia (H. itala, H. obvia); Helicidae Helicigona arbustorum); Helicodiscus; Helix (H. aperta); Limax (L. cinereoniger, L. flavus, L. marginatus, L. maximus, L. tenellus); Lymnaea; Milax (M. gagates, M. marginatus, M. sowerbyi); Opeas; Pomacea (P. canaticulata); Vallonia and Zanitoides.
The term “crops” is to be understood as including also crop plants which have been so transformed by the use of recombinant DNA techniques that they are capable of synthesising one or more selectively acting toxins, such as are known, for example, from toxin-producing bacteria, especially those of the genus Bacillus.
Toxins that can be expressed by such transgenic plants include, for example, insecticidal proteins, for example insecticidal proteins from Bacillus cereus or Bacillus popilliae; or insecticidal proteins from Bacillus thuringiensis, such as 6-endotoxins, e.g. Cry1Ab, Cry1Ac, Cry1F, Cry1 Fa2, Cry2Ab, Cry3A, Cry3Bb1 or Cry9C, or vegetative insecticidal proteins (Vip), e.g. Vip1, Vip2, Vip3 or Vip3A; or insecticidal proteins of bacteria colonising nematodes, for example Photorhabdus spp. or Xenorhabdus spp., such as Photorhabdus luminescens, Xenorhabdus nematophilus; toxins produced by animals, such as scorpion toxins, arachnid toxins, wasp toxins and other insect-specific neurotoxins; toxins produced by fungi, such as Streptomycetes toxins, plant lectins, such as pea lectins, barley lectins or snowdrop lectins; agglutinins; proteinase inhibitors, such as trypsin inhibitors, serine protease inhibitors, patatin, cystatin, papain inhibitors; ribosome-inactivating proteins (RIP), such as ricin, maize-RIP, abrin, luffin, saporin or bryodin; steroid metabolism enzymes, such as 3-hydroxysteroidoxidase, ecdysteroid-UDP-glycosyl-transferase, cholesterol oxidases, ecdysone inhibitors, HMG-COA-reductase, ion channel blockers, such as blockers of sodium or calcium channels, juvenile hormone esterase, diuretic hormone receptors, stilbene synthase, bibenzyl synthase, chitinases and glucanases.
In the context of the present invention there are to be understood by 6-endotoxins, for example Cry1Ab, Cry1Ac, Cry1F, Cry1Fa2, Cry2Ab, Cry3A, Cry3Bb1 or Cry9C, or vegetative insecticidal proteins (Vip), for example Vip1, Vip2, Vip3 or Vip3A, expressly also hybrid toxins, truncated toxins and modified toxins. Hybrid toxins are produced recombinantly by a new combination of different domains of those proteins (see, for example, WO 02/15701). Truncated toxins, for example a truncated Cry1Ab, are known. In the case of modified toxins, one or more amino acids of the naturally occurring toxin are replaced. In such amino acid replacements, preferably non-naturally present protease recognition sequences are inserted into the toxin, such as, for example, in the case of Cry3A055, a cathepsin-G-recognition sequence is inserted into a Cry3A toxin (see WO 03/018810). Examples of such toxins or transgenic plants capable of synthesising such toxins are disclosed, for example, in EP-A-0 374 753, WO 93/07278, WO 95/34656, EP-A-0 427 529, EP-A-451 878 and WO 03/052073.
The processes for the preparation of such transgenic plants are generally known to the person skilled in the art and are described, for example, in the publications mentioned above. Cry1-type deoxyribonucleic acids and their preparation are known, for example, from WO 95/34656, EP-A-0 367 474, EP-A-0 401 979 and WO 90/13651.
The toxin contained in the transgenic plants imparts to the plants tolerance to harmful insects. Such insects can occur in any taxonomic group of insects, but are especially commonly found in the beetles (Coleoptera), two-winged insects (Diptera) and moths (Lepidoptera).
Transgenic plants containing one or more genes that code for an insecticidal resistance and express one or more toxins are known and some of them are commercially available. Examples of such plants are: YieldGard® (maize variety that expresses a Cry1Ab toxin); YieldGard Rootworm® (maize variety that expresses a Cry3Bb1 toxin); YieldGard Plus® (maize variety that expresses a Cry1Ab and a Cry3Bb1 toxin); Starlink® (maize variety that expresses a Cry9C toxin); Herculex I® (maize variety that expresses a Cry1Fa2 toxin and the enzyme phosphinothricine N-acetyltransferase (PAT) to achieve tolerance to the herbicide glufosinate ammonium); NuCOTN 33B® (cotton variety that expresses a Cry1Ac toxin); Bollgard I® (cotton variety that expresses a Cry1Ac toxin); Bollgard II® (cotton variety that expresses a Cry1Ac and a Cry2Ab toxin); VipCot® (cotton variety that expresses a Vip3A and a Cry1Ab toxin); NewLeaf® (potato variety that expresses a Cry3A toxin); NatureGard®, Agrisure® GT Advantage (GA21 glyphosate-tolerant trait), Agrisure® CB Advantage (Bt11 corn borer (CB) trait) and Protecta®.
Further examples of such transgenic crops are:
1. Bt11 Maize from Syngenta Seeds SAS, Chemin de l'Hobit 27, F-31 790 St. Sauveur, France, registration number C/FR/96/05/10. Genetically modified Zea mays which has been rendered resistant to attack by the European corn borer (Ostrinia nubilalis and Sesamia nonagrioides) by transgenic expression of a truncated Cry1Ab toxin. Bt11 maize also transgenically expresses the enzyme PAT to achieve tolerance to the herbicide glufosinate ammonium.
2. Bt176 Maize from Syngenta Seeds SAS, Chemin de l'Hobit 27, F-31 790 St. Sauveur, France, registration number C/FR/96/05/10. Genetically modified Zea mays which has been rendered resistant to attack by the European corn borer (Ostrinia nubilalis and Sesamia nonagrioides) by transgenic expression of a Cry1Ab toxin. Bt176 maize also transgenically expresses the enzyme PAT to achieve tolerance to the herbicide glufosinate ammonium.
3. MIR604 Maize from Syngenta Seeds SAS, Chemin de l'Hobit 27, F-31 790 St. Sauveur, France, registration number C/FR/96/05/10. Maize which has been rendered insect-resistant by transgenic expression of a modified Cry3A toxin. This toxin is Cry3A055 modified by insertion of a cathepsin-G-protease recognition sequence. The preparation of such transgenic maize plants is described in WO 03/018810.
4. MON 863 Maize from Monsanto Europe S.A. 270-272 Avenue de Tervuren, B-1150 Brussels, Belgium, registration number C/DE/02/9. MON 863 expresses a Cry3Bb1 toxin and has resistance to certain Coleoptera insects.
5. IPC 531 Cotton from Monsanto Europe S.A. 270-272 Avenue de Tervuren, B-1150 Brussels, Belgium, registration number C/ES/96/02.
6. 1507 Maize from Pioneer Overseas Corporation, Avenue Tedesco, 7 B-1160 Brussels, Belgium, registration number C/NL/00/10. Genetically modified maize for the expression of the protein Cry1F for achieving resistance to certain Lepidoptera insects and of the PAT protein for achieving tolerance to the herbicide glufosinate ammonium.
7. NK603×MON 810 Maize from Monsanto Europe S.A. 270-272 Avenue de Tervuren, B-1150 Brussels, Belgium, registration number C/GB/02/M3/03. Consists of conventionally bred hybrid maize varieties by crossing the genetically modified varieties NK603 and MON 810. NK603×MON 810 Maize transgenically expresses the protein CP4 EPSPS, obtained from Agrobacterium sp. strain CP4, which imparts tolerance to the herbicide Roundup® (contains glyphosate), and also a CrylAb toxin obtained from Bacillus thuringiensis subsp. kurstaki which brings about tolerance to certain Lepidoptera, include the European corn borer.
Transgenic crops of insect-resistant plants are also described in BATS (Zentrum für Biosicherheit und Nachhaltigkeit, Zentrum BATS, Clarastrasse 13, 4058 Basel, Switzerland) Report 2003, (http://bats.ch).
The term “crops” is to be understood as including also crop plants which have been so transformed by the use of recombinant DNA techniques that they are capable of synthesising antipathogenic substances having a selective action, such as, for example, the so-called “pathogenesis-related proteins” (PRPs, see e.g. EP-A-0 392 225). Examples of such antipathogenic substances and transgenic plants capable of synthesising such antipathogenic substances are known, for example, from EP-A-0 392 225, WO 95/33818 and EP-A-0 353 191. The methods of producing such transgenic plants are generally known to the person skilled in the art and are described, for example, in the publications mentioned above.
Crops may also be modified for enhanced resistance to fungal (for example Fusarium, Anthracnose, or Phytophthora), bacterial (for example Pseudomonas) or viral (for example potato leafroll virus, tomato spotted wilt virus, cucumber mosaic virus) pathogens.
Crops also include those that have enhanced resistance to nematodes, such as the soybean cyst nematode.
Crops that are tolerance to abiotic stress include those that have enhanced tolerance to drought, high salt, high temperature, chill, frost, or light radiation, for example through expression of NF—YB or other proteins known in the art.
Antipathogenic substances which can be expressed by such transgenic plants include, for example, ion channel blockers, such as blockers for sodium and calcium channels, for example the viral KP1, KP4 or KP6 toxins; stilbene synthases; bibenzyl synthases; chitinases; glucanases; the so-called “pathogenesis-related proteins” (PRPs; see e.g. EP-A-0 392 225); antipathogenic substances produced by microorganisms, for example peptide antibiotics or heterocyclic antibiotics (see e.g. WO 95/33818) or protein or polypeptide factors involved in plant pathogen defence (so-called “plant disease resistance genes”, as described in WO 03/000906).
Further areas of use of the compositions according to the invention are the protection of stored goods and store rooms and the protection of raw materials, such as wood, textiles, floor coverings or buildings, and also in the hygiene sector, especially the protection of humans, domestic animals and productive livestock against pests of the mentioned type.
The present invention also provides a method for controlling pests (such as mosquitoes and other disease vectors; see also http://www.who.int/malaria/vector_control/irs/en/). In one embodiment, the method for controlling pests comprises applying the compositions of the invention to the target pests, to their locus or to a surface or substrate by brushing, rolling, spraying, spreading or dipping. By way of example, an IRS (indoor residual spraying) application of a surface such as a wall, ceiling or floor surface is contemplated by the method of the invention. In another embodiment, it is contemplated to apply such compositions to a substrate such as non-woven or a fabric material in the form of (or which can be used in the manufacture of) netting, clothing, bedding, curtains and tents.
In one embodiment, the method for controlling such pests comprises applying a pesticidally effective amount of the compositions of the invention to the target pests, to their locus, or to a surface or substrate so as to provide effective residual pesticidal activity on the surface or substrate. Such application may be made by brushing, rolling, spraying, spreading or dipping the pesticidal composition of the invention. By way of example, an IRS application of a surface such as a wall, ceiling or floor surface is contemplated by the method of the invention so as to provide effective residual pesticidal activity on the surface. In another embodiment, it is contemplated to apply such compositions for residual control of pests on a substrate such as a fabric material in the form of (or which can be used in the manufacture of) netting, clothing, bedding, curtains and tents.
Substrates including non-woven, fabrics or netting to be treated may be made of natural fibres such as cotton, raffia, jute, flax, sisal, hessian, or wool, or synthetic fibres such as polyamide, polyester, polypropylene, polyacrylonitrile or the like. The polyesters are particularly suitable. The methods of textile treatment are known, e.g. WO 2008/151984, WO 2003/034823, U.S. Pat. No. 5,631,072, WO 2005/64072, WO2006/128870, EP 1724392, WO 2005113886 or WO 2007/090739.
Further areas of use of the compositions according to the invention are the field of tree injection/trunk treatment for all ornamental trees as well all sort of fruit and nut trees.
In the field of tree injection/trunk treatment, the compounds according to the present invention are especially suitable against wood-boring insects from the order Lepidoptera as mentioned above and from the order Coleoptera, especially against woodborers listed in the following tables A and B:
Agrilus planipennis
Anoplura glabripennis
Xylosandrus crassiusculus
X. mutilatus
Tomicus piniperda
Agrilus anxius
Agrilus politus
Agrilus sayi
Agrilus vittaticolllis
Chrysobothris femorata
Texania campestris
Goes pulverulentus
Goes tigrinus
Neoclytus acuminatus
Neoptychodes trilineatus
Oberea ocellata
Oberea tripunctata
Oncideres cingulata
Saperda calcarata
Strophiona nitens
Corthylus columbianus
Dendroctonus frontalis
Dryocoetes betulae
Monarthrum fasciatum
Phloeotribus liminaris
Pseudopityophthorus pruinosus
Paranthrene simulans
Sannina uroceriformis
Synanthedon exitiosa
Synanthedon pictipes
Synanthedon rubrofascia
Synanthedon scitula
Vitacea polistiformis
The present invention may be also used to control any insect pests that may be present in turfgrass, including for example beetles, caterpillars, fire ants, ground pearls, millipedes, sow bugs, mites, mole crickets, scales, mealybugs ticks, spittlebugs, southern chinch bugs and white grubs. The present invention may be used to control insect pests at various stages of their life cycle, including eggs, larvae, nymphs and adults.
In particular, the present invention may be used to control insect pests that feed on the roots of turfgrass including white grubs (such as Cyclocephala spp. (e.g. masked chafer, C. lurida), Rhizotrogus spp. (e.g. European chafer, R. majalis), Cotinus spp. (e.g. Green June beetle, C. nitida), Popillia spp. (e.g. Japanese beetle, P. japonica), Phyllophaga spp. (e.g. May/June beetle), Ataenius spp. (e.g. Black turfgrass ataenius, A. spretulus), Maladera spp. (e.g. Asiatic garden beetle, M. castanea) and Tomarus spp.), ground pearls (Margarodes spp.), mole crickets (tawny, southern, and short-winged; Scapteriscus spp., Gryllotalpa africana) and leatherjackets (European crane fly, Tipula spp.).
The present invention may also be used to control insect pests of turfgrass that are thatch dwelling, including armyworms (such as fall armyworm Spodoptera frugiperda, and common armyworm Pseudaletia unipuncta), cutworms, billbugs (Sphenophorus spp., such as S. venatus verstitus and S. parvulus), and sod webworms (such as Crambus spp. and the tropical sod webworm, Herpetogramma phaeopteralis).
The present invention may also be used to control insect pests of turfgrass that live above the ground and feed on the turfgrass leaves, including chinch bugs (such as southern chinch bugs, Blissus insularis), Bermudagrass mite (Eriophyes cynodoniensis), rhodesgrass mealybug (Antonina graminis), two-lined spittlebug (Propsapia bicincta), leafhoppers, cutworms (Noctuidae family), and greenbugs. The present invention may also be used to control other pests of turfgrass such as red imported fire ants (Solenopsis invicta) that create ant mounds in turf.
In the hygiene sector, the compositions according to the invention are active against ectoparasites such as hard ticks, soft ticks, mange mites, harvest mites, flies (biting and licking), parasitic fly larvae, lice, hair lice, bird lice and fleas.
Examples of such parasites are:
The compositions according to the invention are also suitable for protecting against insect infestation in the case of materials such as wood, textiles, plastics, adhesives, glues, paints, paper and card, leather, floor coverings and buildings.
The compositions according to the invention can be used, for example, against the following pests: beetles such as Hylotrupes bajulus, Chlorophorus pilosis, Anobium punctatum, Xestobium rufovillosum, Ptilinuspecticornis, Dendrobium pertinex, Ernobius mollis, Priobium carpini, Lyctus brunneus, Lyctus africanus, Lyctus planicollis, Lyctus linearis, Lyctus pubescens, Trogoxylon aequale, Minthesrugicollis, Xyleborus spec., Tryptodendron spec., Apate monachus, Bostrychus capucins, Heterobostrychus brunneus, Sinoxylon spec. and Dinoderus minutus, and also hymenopterans such as Sirexjuvencus, Urocerus gigas, Urocerus gigas taignus and Urocerus augur, and termites such as Kalotermes flavicollis, Cryptotermes brevis, Heterotermes indicola, Reticulitermes flavipes, Reticulitermes santonensis, Reticulitermes lucifugus, Mastotermes darwiniensis, Zootermopsis nevadensis and Coptotermes formosanus, and bristletails such as Lepisma saccharina.
The compounds according to the invention can be used as pesticidal agents in unmodified form, but they are generally formulated into compositions in various ways using formulation adjuvants, such as carriers, solvents and surface-active substances. The formulations can be in various physical forms, e.g. in the form of dusting powders, gels, wettable powders, water-dispersible granules, water-dispersible tablets, effervescent pellets, emulsifiable concentrates, microemulsifiable concentrates, oil-in-water emulsions, oil-flowables, aqueous dispersions, oily dispersions, suspo-emulsions, capsule suspensions, emulsifiable granules, soluble liquids, water-soluble concentrates (with water or a water-miscible organic solvent as carrier), impregnated polymer films or in other forms known e.g. from the Manual on Development and Use of FAO and WHO Specifications for Pesticides, United Nations, First Edition, Second Revision (2010). Such formulations can either be used directly or diluted prior to use. The dilutions can be made, for example, with water, liquid fertilisers, micronutrients, biological organisms, oil or solvents.
The formulations can be prepared e.g. by mixing the active ingredient with the formulation adjuvants in order to obtain compositions in the form of finely divided solids, granules, solutions, dispersions or emulsions. The active ingredients can also be formulated with other adjuvants, such as finely divided solids, mineral oils, oils of vegetable or animal origin, modified oils of vegetable or animal origin, organic solvents, water, surface-active substances or combinations thereof.
The active ingredients can also be contained in very fine microcapsules. Microcapsules contain the active ingredients in a porous carrier. This enables the active ingredients to be released into the environment in controlled amounts (e.g. slow-release). Microcapsules usually have a diameter of from 0.1 to 500 microns. They contain active ingredients in an amount of about from 25 to 95% by weight of the capsule weight. The active ingredients can be in the form of a monolithic solid, in the form of fine particles in solid or liquid dispersion or in the form of a suitable solution. The encapsulating membranes can comprise, for example, natural or synthetic rubbers, cellulose, styrene/butadiene copolymers, polyacrylonitrile, polyacrylate, polyesters, polyamides, polyureas, polyurethane or chemically modified polymers and starch xanthates or other polymers that are known to the person skilled in the art. Alternatively, very fine microcapsules can be formed in which the active ingredient is contained in the form of finely divided particles in a solid matrix of base substance, but the microcapsules are not themselves encapsulated.
The formulation adjuvants that are suitable for the preparation of the compositions according to the invention are known per se. As liquid carriers there may be used: water, toluene, xylene, petroleum ether, vegetable oils, acetone, methyl ethyl ketone, cyclohexanone, acid anhydrides, acetonitrile, acetophenone, amyl acetate, 2-butanone, butylene carbonate, chlorobenzene, cyclohexane, cyclohexanol, alkyl esters of acetic acid, diacetone alcohol, 1,2-dichloropropane, diethanolamine, p-diethylbenzene, diethylene glycol, diethylene glycol abietate, diethylene glycol butyl ether, diethylene glycol ethyl ether, diethylene glycol methyl ether, N,N-dimethylformamide, dimethyl sulfoxide, 1,4-dioxane, dipropylene glycol, dipropylene glycol methyl ether, dipropylene glycol dibenzoate, diproxitol, alkylpyrrolidone, ethyl acetate, 2-ethylhexanol, ethylene carbonate, 1,1,1-trichloroethane, 2-heptanone, alpha-pinene, d-limonene, ethyl lactate, ethylene glycol, ethylene glycol butyl ether, ethylene glycol methyl ether, gamma-butyrolactone, glycerol, glycerol acetate, glycerol diacetate, glycerol triacetate, hexadecane, hexylene glycol, isoamyl acetate, isobornyl acetate, isooctane, isophorone, isopropylbenzene, isopropyl myristate, lactic acid, laurylamine, mesityl oxide, methoxy-propanol, methyl isoamyl ketone, methyl isobutyl ketone, methyl laurate, methyl octanoate, methyl oleate, methylene chloride, m-xylene, n-hexane, n-octylamine, octadecanoic acid, octylamine acetate, oleic acid, oleylamine, o-xylene, phenol, polyethylene glycol, propionic acid, propyl lactate, propylene carbonate, propylene glycol, propylene glycol methyl ether, p-xylene, toluene, triethyl phosphate, triethylene glycol, xylenesulfonic acid, paraffin, mineral oil, trichloroethylene, perchloroethylene, ethyl acetate, amyl acetate, butyl acetate, propylene glycol methyl ether, diethylene glycol methyl ether, methanol, ethanol, isopropanol, and alcohols of higher molecular weight, such as amyl alcohol, tetrahydrofurfuryl alcohol, hexanol, octanol, ethylene glycol, propylene glycol, glycerol, N-methyl-2-pyrrolidone and the like.
Suitable solid carriers are, for example, talc, titanium dioxide, pyrophyllite clay, silica, attapulgite clay, kieselguhr, limestone, calcium carbonate, bentonite, calcium montmorillonite, cottonseed husks, wheat flour, soybean flour, pumice, wood flour, ground walnut shells, lignin and similar substances. A large number of surface-active substances can advantageously be used in both solid and liquid formulations, especially in those formulations which can be diluted with a carrier prior to use. Surface-active substances may be anionic, cationic, non-ionic or polymeric and they can be used as emulsifiers, wetting agents or suspending agents or for other purposes. Typical surface-active substances include, for example, salts of alkyl sulfates, such as diethanolammonium lauryl sulfate; salts of alkylarylsulfonates, such as calcium dodecylbenzenesulfonate; alkylphenol/alkylene oxide addition products, such as nonylphenol ethoxylate; alcohol/alkylene oxide addition products, such as tridecylalcohol ethoxylate; soaps, such as sodium stearate; salts of alkylnaphthalenesulfonates, such as sodium dibutylnaphthalenesulfonate; dialkyl esters of sulfosuccinate salts, such as sodium di(2-ethylhexyl)sulfosuccinate; sorbitol esters, such as sorbitol oleate; quaternary amines, such as lauryltrimethylammonium chloride, polyethylene glycol esters of fatty acids, such as polyethylene glycol stearate; block copolymers of ethylene oxide and propylene oxide; and salts of mono- and di-alkylphosphate esters; and also further substances described e.g. in McCutcheon's Detergents and Emulsifiers Annual, MC Publishing Corp., Ridgewood New Jersey (1981).
Further adjuvants that can be used in pesticidal formulations include crystallisation inhibitors, viscosity modifiers, suspending agents, dyes, anti-oxidants, foaming agents, light absorbers, mixing auxiliaries, antifoams, complexing agents, neutralising or pH-modifying substances and buffers, corrosion inhibitors, fragrances, wetting agents, take-up enhancers, micronutrients, plasticisers, glidants, lubricants, dispersants, thickeners, antifreezes, microbicides, and liquid and solid fertilisers. The compositions according to the invention can include an additive comprising an oil of vegetable or animal origin, a mineral oil, alkyl esters of such oils or mixtures of such oils and oil derivatives. The amount of oil additive in the composition according to the invention is generally from 0.01 to 10%, based on the mixture to be applied. For example, the oil additive can be added to a spray tank in the desired concentration after a spray mixture has been prepared. Preferred oil additives comprise mineral oils or an oil of vegetable origin, for example rapeseed oil, olive oil or sunflower oil, emulsified vegetable oil, alkyl esters of oils of vegetable origin, for example the methyl derivatives, or an oil of animal origin, such as fish oil or beef tallow. Preferred oil additives comprise alkyl esters of C8-C22 fatty acids, especially the methyl derivatives of C12-C18 fatty acids, for example the methyl esters of lauric acid, palmitic acid and oleic acid (methyl laurate, methyl palmitate and methyl oleate, respectively). Many oil derivatives are known from the Compendium of Herbicide Adjuvants, 10th Edition, Southern Illinois University, 2010.
The inventive compositions generally comprise from 0.1 to 99% by weight, especially from 0.1 to 95% by weight, of compounds of the present invention and from 1 to 99.9% by weight of a formulation adjuvant which preferably includes from 0 to 25% by weight of a surface-active substance. Whereas commercial products may preferably be formulated as concentrates, the end user will normally employ dilute formulations.
The rates of application vary within wide limits and depend on the nature of the soil, the method of application, the crop plant, the pest to be controlled, the prevailing climatic conditions, and other factors governed by the method of application, the time of application and the target crop. As a general guideline compounds may be applied at a rate of from 1 to 2000 I/ha, especially from 10 to 1000 I/ha.
Preferred formulations can have the following compositions (weight %):
Emulsifiable Concentrates:
Dusts:
Suspension Concentrates:
Wettable Powders:
Granules:
The following Examples further illustrate, but do not limit, the invention.
The combination is thoroughly mixed with the adjuvants and the mixture is thoroughly ground in a suitable mill, affording wettable powders that can be diluted with water to give suspensions of the desired concentration.
The combination is thoroughly mixed with the adjuvants an the mixture is thoroughly ground in a suitable mill, affording powders that can be used directly for seed treatment.
Emulsions of any required dilution, which can be used in plant protection, can be obtained from this concentrate by dilution with water.
Ready-for-use dusts are obtained by mixing the combination with the carrier and grinding the mixture in a suitable mill. Such powders can also be used for dry dressings for seed.
The combination is mixed and ground with the adjuvants, and the mixture is moistened with water. The mixture is extruded and then dried in a stream of air.
The finely ground combination is uniformly applied, in a mixer, to the kaolin moistened with polyethylene glycol. Non-dusty coated granules are obtained in this manner.
Suspension Concentrate
The finely ground combination is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired dilution can be obtained by dilution with water. Using such dilutions, living plants as well as plant propagation material can be treated and protected against infestation by microorganisms, by spraying, pouring or immersion.
Flowable Concentrate for Seed Treatment
The finely ground combination is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired dilution can be obtained by dilution with water. Using such dilutions, living plants as well as plant propagation material can be treated and protected against infestation by microorganisms, by spraying, pouring or immersion.
Slow Release Capsule Suspension
28 parts of the combination are mixed with 2 parts of an aromatic solvent and 7 parts of toluene diisocyanate/polymethylene-polyphenylisocyanate-mixture (8:1). This mixture is emulsified in a mixture of 1.2 parts of polyvinylalcohol, 0.05 parts of a defoamer and 51.6 parts of water until the desired particle size is achieved. To this emulsion a mixture of 2.8 parts 1,6-diaminohexane in 5.3 parts of water is added. The mixture is agitated until the polymerization reaction is completed. The obtained capsule suspension is stabilized by adding 0.25 parts of a thickener and 3 parts of a dispersing agent. The capsule suspension formulation contains 28% of the active ingredients. The medium capsule diameter is 8-15 microns. The resulting formulation is applied to seeds as an aqueous suspension in an apparatus suitable for that purpose.
Formulation types include an emulsion concentrate (EC), a suspension concentrate (SC), a suspo-emulsion (SE), a capsule suspension (CS), a water dispersible granule (WG), an emulsifiable granule (EG), an emulsion, water in oil (EO), an emulsion, oil in water (EW), a micro-emulsion (ME), an oil dispersion (OD), an oil miscible flowable (OF), an oil miscible liquid (OL), a soluble concentrate (SL), an ultra-low volume suspension (SU), an ultra-low volume liquid (UL), a technical concentrate (TK), a dispersible concentrate (DC), a wettable powder (WP), a soluble granule (SG) or any technically feasible formulation in combination with agriculturally acceptable adjuvants.
Preparatory Examples
“Mp” means melting point in 0C. Free radicals represent methyl groups. 1H NMR measurements were recorded on a Brucker 400 MHz spectrometer, chemical shifts are given in ppm relevant to a TMS standard. Spectra measured in deuterated solvents as indicated. Either one of the LCMS methods below was used to characterize the compounds. The characteristic LCMS values obtained for each compound were the retention time (“Rt”, recorded in minutes) and the measured molecular ion (M+H)+, (M−H)− or (M)+.
Method 1:
Spectra were recorded on a Mass Spectrometer from Waters (SQD Single quadrupole mass spectrometer) equipped with an electrospray source (Polarity: positive or negative ions, Full Scan, Capillary: 3.00 kV, Cone range: 41 V, Source Temperature: 150° C., Desolvation Temperature: 500° C., Cone Gas Flow: 50 L/Hr, Desolvation Gas Flow: 1000 L/Hr, Mass range: 110 to 800 Da) and a H-Class UPLC from Waters: quaternary pump, heated column compartment and diode-array detector. Column: Acquity UPLC HSS T3 C18, 1.8 μm, 30×2.1 mm, Temp: 40° C., DAD Wavelength range (nm): 200 to 400, Solvent Gradient: A=water+5% Acetonitrile+0.1% HCOOH, B=Acetonitrile+0.05% HCOOH: gradient: 0 min 10% B; 0.-0.2 min 10-50% B; 0.2-0.7 min 50-100% B; 0.7-1.3 min 100% B; 1.3-1.4 min 100-10% B; 1.4-1.6 min 10% B; Flow (mL/min) 0.6.
Method 2:
Spectra were recorded on a Mass Spectrometer from Agilent Technologies (6410 Triple Quadrupole mass spectrometer) equipped with an equipped with an electrospray source (Polarity: positive or negative ions, MS2 Scan, Capillary: 4.00 kV, Fragmentor: 100 V, Desolvatation Temperature: 350° C., Gas Flow: 11 L/min, Nebulizer Gas: 45 psi, Mass range: 110 to 1000 Da) and a 1200 Series HPLC from Agilent: quaternary pump, heated column compartment and diode-array detector. Column: KINETEX EVO C18, 2.6 μm, 50×4.6 mm, Temp: 40° C., DAD Wavelength range (nm): 210 to 400, Solvent Gradient: A=water+5% Acetonitrile+0.1% HCOOH, B=Acetonitrile+0.1% HCOOH: gradient: 0 min 10% B, 90% A; 0.9-1.8 min 100% B; 1.8-2.2 min 100-10% B; 2.2-2.5 min 10% B; Flow (mL/min) 1.8.
A 2.0 M butyllithium solution in tetrahydrofuran (165 mL, 330 mmol) was added dropwise to a −78° C. cooled solution of 2,2,6,6-tetramethylpiperidine (35.0 g, 248 mmol) in tetrahydrofuran (500 mL). After complete addition, the reaction mixture was stirred for 30 min at −50° C. and cooled again to −78° C. before adding a solution of 5-chloro-2-(trifluoromethyl)pyridine (15.0 g, 82.6 mmol) in tetrahydrofuran (100 mL). The reaction mixture was stirred for 30 min at −78° C. before being added via canula to a CO2 saturated solution of tetrahydrofuran cooled at −78° C. Once the addition was complete, the reaction mixture was warmed up to room temperature, and quenched by addition of a saturated ammonium chloride aqueous solution (200 mL). The aqueous phase was extracted with ethyl acetate (2×200 mL), the combined organic phases were dried over sodium sulfate, filtered and concentrated under reduced pressure to give 2,2,6,6-tetramethylpiperidin-1-ium 5-chloro-2-(trifluoromethyl)pyridine-4-carboxylate (intermediate 1-2). The aqueous phase was acidified to pH 3 by addition of a 2 N hydrochloric acid aqueous solution and extracted twice with a 90/10 mixture of dichloromethane/methanol (200 mL). The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo to afford 5-chloro-2-(trifluoromethyl)pyridine-4-carboxylic acid (intermediate I-1). Both crude materials were used in the next step without further purification. LCMS (method 1): Rt=0.67 min, m/z=226/228 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm: 8.18 (s, 1H), 8.98 (s, 1H).
A mixture of 5-chloro-2-(trifluoromethyl)pyridine-4-carboxylic acid (intermediate I-1 prepared as described above) (1.00 g, 4.43 mmol) and concentrated sulfuric acid (1.00 mL) in ethanol (30 mL) was heated at reflux overnight. After cooling down to room temperature, the reaction mixture was concentrated and the residue was diluted with iced water (50 mL). The aqueous phase was extracted with ethyl acetate (2×30 mL), the combined organic layers were washed with brine (30 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 10-15% ethyl acetate in cyclohexane) to afford pure ethyl 5-chloro-2-(trifluoromethyl)pyridine-4-carboxylate as a yellow liquid. LCMS (method 1): Rt=1.10 min, m/z=254/256 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.45 (t, 3H), 4.49 (q, 2H), 8.04 (s, 1H), 8.82 (s, 1H).
Tripotassium phosphate (4.5 g, 21.3 mmol) and tricyclohexylphosphine (0.2 g, 0.71 mmol) were added to a mixture of ethyl 5-chloro-2-(trifluoromethyl)pyridine-4-carboxylate (intermediate 1-3 prepared as described above) (1.8 g, 7.1 mmol) and methyl-boronic acid (1.3 g, 21.3 mmol) in toluene (50 mL) and water (5.0 mL). The mixture was purged with nitrogen for 10 min before adding palladium acetate (0.08 g, 0.035 mmol). Purging was continued for 10 min and the reaction mixture was heated at 100° C. for 2 hours. After cooling down to room temperature, the mixture was diluted with water (50 mL) and ethyl acetate (50 mL), and filtered over Celite (washed with ethyl acetate). The phases were separated, the aqueous phase was extracted with ethyl acetate, the combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 20% ethyl acetate in cyclohexane) to afford pure ethyl 5-methyl-2-(trifluoromethyl)pyridine-4-carboxylate as a pale yellow liquid. LCMS (method 1): Rt=1.08 min, m/z=234 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.44 (t, 3H), 2.66 (s, 3H), 4.44 (q, 2H), 8.08 (s, 1H), 8.68 (s, 1H).
N-bromosuccinimide (1.40 g, 7.80 mmol) and benzoyl peroxide (0.42 g, 1.70 mmol) were added to a solution of ethyl 5-methyl-2-(trifluoromethyl)pyridine-4-carboxylate (intermediate 1-4 prepared as described above) (1.30 g, 5.60 mmol) in tetrachloromethane (45 mL). The reaction mixture was heated at 70° C. overnight. After cooling down to room temperature, the reaction mixture was diluted with iced water (20 mL), and the aqueous phase was extracted with ethyl acetate (2×10 mL). The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 10-15% ethyl acetate in cyclohexane) to afford ethyl 5-(bromomethyl)-2-(trifluoromethyl)pyridine-4-carboxylate. LCMS (method 1): Rt=1.12 min, m/z=312/314 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.44 (t, 3H), 4.50 (q, 2H), 4.94 (s, 2H), 7.27 (s, 1H), 8.14 (s, 1H), 8.85 (s, 1H).
To a solution of 2-chloro-5-(trifluoromethyl)pyridine-3-carboxylic acid (18.0 g, 79.80 mmol) in N,N-dimethylformamide (100 mL) was added cesium carbonate (31.20 g, 95.766 mmol) under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 5 minutes and then, iodoethane (9.82 mL, 119.71 mmol) was added to the reaction mass. The reaction mixture was stirred at room temperature for 2 hours. The reaction mass was diluted with ice cold water, extracted with ethyl acetate (2×). The combined organic layers were washed with ice cold water (3×200 mL) followed by brine, dried over sodium sulfate, filtered and concentrated in vacuo to afford ethyl 2-chloro-5-(trifluoromethyl)pyridine-3-carboxylate. This material was used as such for the next step. LCMS (method 1): Rt=1.03 min, m/z=254/256 (M+H)+.
To a solution of ethyl 2-chloro-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-53 prepared as described above) (11.1 g, 43.8 mmol) in toluene (111 mL) was added water (11 mL) and the reaction mass was degassed with nitrogen for 5 minutes. Tricyclohexylphosphane (1.23 g, 4.38 mmol), tripotassium phosphate (27.9 g, 131 mmol) and methylboronic acid (8.10 g, 131 mmol) were added to the reaction mass and purged with nitrogen for additional 10 minutes. Palladium acetate (0.492 g., 2.19 mmol) was added to the reaction mass and purging was continued for 5 minutes. The reaction mixture was heated at 100° C. for 8 hours. After cooling down to room temperature, the mixture was diluted with water (100 mL) and ethyl acetate (100 mL). The phases were separated, the organic layer was dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 5-10% ethyl acetate in cyclohexane) to afford ethyl 2-methyl-5-(trifluoromethyl)pyridine-3-carboxylate. LCMS (method 1): Rt=1.04 min, m/z=234 (M+H)+.
To a solution of ethyl 2-methyl-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-54 prepared as described above) (12.0 g, 47.3 mmol) in trifluoromethylbenzene (120 mL) were added N-bromosuccinimide (9.89 g, 54.4 mmol) and 2,2′-azobis(isobutyronitrile) (0.777 g, 4.73 mmol). The reaction mixture was stirred at 90° C. for 5 hours, then at 80° C. for overnight. After cooling down to room temperature, the reaction mass was diluted with water (60 mL) and stirred for 10 minutes. The organic layer was separated, and the aqueous phase was extracted with ethyl acetate (150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 0-2% ethyl acetate in cyclohexane) to afford ethyl 2-(bromomethyl)-5-(trifluoromethyl)pyridine-3-carboxylate as an oily mass. LCMS (method 1): Rt=1.11 min, m/z=312/314 (M+H)+.
To a mixture of 5-bromopyridine-2-carbaldehyde (10.0 g, 53.8 mmol) and cyclopropylboronic acid (6.93 g, 80.6 mmol) in toluene (150 mL) and water (30 mL) were added 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (4.55 g, 10.8 mmol) and tripotassium phosphate (34.24 g, 161.3 mmol) at room temperature while purged with nitrogen for 15 minutes. Palladium (Ill)acetate (1.21 g, 5.40 mmol) was added and the reaction mixture was degassed with nitrogen for additional 10 minutes. The reaction mixture was stirred at 100° C. for 3 hours. After completion, reaction mass was cooled down to room temperature and diluted with water (300 mL) and ethyl acetate (250 mL), separated both the layers. The aqueous layer was washed ethyl acetate (2×200 mL). The combined organic layers were washed with brine (150 mL), filtered over Celite bed, dried over sodium sulfate and filtered, concentrated in vacuo (water bath temperature was kept below 45° C.). The crude compound was purified by combiflash (silica gel, 0-30% ethyl acetate in cyclohexane) to afford pure 5-cyclopropylpyridine-2-carbaldehyde as an oily residue. 1H NMR (400 MHz, CDCl3) δ ppm: 0.79-0.84 (m, 2H) 1.10-1.17 (m, 2H) 1.91-2.02 (m, 1H) 7.38 (dd, 1H) 7.82 (d, 1H) 8.53 (d, 1H) 10.00 (s, 1H).
To a −15° C. cooled solution of 5-cyclopropylpyridine-2-carbaldehyde (intermediate 1-6 prepared as described above) (1.00 g, 6.8 mmol) and ethyl 2-azidoacetate (0.99 g, 7.5 mmol) in methanol (5 mL) was added dropwise a solution of sodium methoxide (25 mass %) in methanol (1.8 mL, 7.7 mmol) and the reaction mixture was stirred at 0° C. for 7 hours. The reaction mass was quenched with ice cold water (100 mL) followed by saturated aqueous ammonium chloride (100 mL), and the mixture was extracted with ethyl acetate (3×50 mL). The combined organic layers were washed with brine (50 mL), dried over sodium sulfate, filtered and concentrated in vacuo (not to dryness, water bath temperature was kept below 30° C.) to afford methyl 2-azido-3-(5-cyclopropyl-2-pyridyl)prop-2-enoate as a brown gummy mass. This material was used as such for the next step. LCMS (method 1): Rt=1.01 min, m/z=217 [(M+H)+−28]. 1H NMR (400 MHz, CDCl3) δ ppm: 0.75-0.79 (m, 2H) 1.05-1.10 (m, 2H) 1.88-1.94 (m, 1H) 3.91 (s, 3H) 7.08 (s, 1H) 7.29-7.33 (m, 1H) 8.09 (d, 1H) 8.44 (d, 1H).
To the mesitylene (6 mL) was added a solution of the methyl 2-azido-3-(5-cyclopropyl-2-pyridyl)prop-2-enoate (intermediate 1-7 prepared as described above) (0.90 g, 3.7 mmol) in mesitylene (10 mL) dropwise at 150° C. The reaction mixture was stirred at 160° C. for 1 hour. The reaction mass was concentrated in vacuo (water bath temperature was kept below 45° C.) and co-evaporated with toluene. The crude compound was purified by combiflash (silica gel, 0-10% ethyl acetate in cyclohexane) to afford pure methyl 6-cyclopropylpyrazolo[1,5-a]pyridine-2-carboxylate as a yellow gummy mass. LCMS (method 2): Rt=1.40 min, m/z=217 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 0.69-0.74 (m, 2H) 0.98-1.04 (m, 2H) 1.90-1.96 (m, 1H) 3.99 (s, 3H) 6.94 (dd, 1H) 7.02 (s, 1H) 7.49 (d, 1H) 8.30 (s, 1H).
To a solution of methyl 6-cyclopropylpyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-8 prepared as described above) (0.68 g, 3.1 mmol) in acetonitrile (7 mL) was added portion wise 1-iodopyrrolidine-2,5-dione (1.06 g, 4.7 mmol) at room temperature. The reaction mixture was stirred at 60° C. for 2 hours. The reaction mixture was cooled to room temperature, diluted with water (100 mL), and the mixture was extracted with ethyl acetate (2×100 mL). The combined organic layers were washed with brine (50 mL), dried over sodium sulphate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 0-30% ethyl acetate in cyclohexane) to afford pure methyl 6-cyclopropyl-3-iodo-pyrazolo[1,5-a]pyridine-2-carboxylate. LCMS (method 2): Rt=1.51 min, m/z=343 (M+H)+. 1H NMR (400 MHz, CDCl6) δ ppm: 0.63-0.69 (m, 2H) 0.94-1.00 (m, 2H) 1.83-1.92 (m, 1H) 3.95 (s, 3H) 6.96 (dd, 1H) 7.41 (d, 1H) 8.20 (s, 1H).
To a solution of methyl 6-cyclopropyl-3-iodo-pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-9 prepared as described above) (0.64 g, 1.9 mmol) in anhydrous 1,4-dioxane (8 mL) were added N-ethyl-N-isopropyl-propan-2-amine (0.8 mL, 4.8 mmol,) and (5-diphenylphosphanyl-9,9-dimethyl-xanthen-4-yl)-diphenyl-phosphane (0.05 g, 0.1 mmol) at room temperature while purged with nitrogen for 5 minutes. Tris(dibenzylideneacetone)dipalladium(0) (0.07 g, 0.1 mmol) was added and degassed with nitrogen for additional 5 minutes, then sodium ethanethiolate (0.23 g, 2.2 mmol) was added under nitrogen atmosphere and the reaction mixture was stirred at 105° C. for 2.5 hours. The reaction mass was diluted with ethyl acetate (100 mL) and filtered over Celite bed, washed with ethyl acetate (100 mL). The filtrate was washed with water (100 mL) followed by brine (100 mL) and the organic layer was separated. The aqueous layer was extracted with ethyl acetate (100 mL) and the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 0-20% ethyl acetate in cyclohexane) to afford pure methyl 6-cyclopropyl-3-ethylsulfanyl-pyrazolo[1,5-a]pyridine-2-carboxylate as a gummy mass. LCMS (method 2): Rt=1.54 min, m/z=277 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 0.70-0.76 (m, 2H) 1.00-1.06 (m, 2H) 1.15 (t, 3H) 1.90-1.98 (m, 1H) 2.85 (q, 2H) 4.02 (s, 3H) 7.03 (dd, 1H) 7.69 (d, 1H) 8.27 (s, 1H).
To a 0° C. cooled solution of methyl 6-cyclopropyl-3-ethylsulfanyl-pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-10 prepared as described above) (0.04 g, 0.1 mmol) in trifluoromethylbenzene (2 mL) was added 3-chlorobenzenecarboperoxoic acid (0.07 g, 0.3 mmol, 70 mass %). The reaction mixture was stirred at 0 to 10° C. for 1.5 hours. The reaction mass was diluted with water (50 mL) and basified with aqueous 2N sodium hydroxide solution. The aqueous phase was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with brine (20 mL), dried over sodium sulfate and concentrated in vacuo to afford methyl 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridine-2-carboxylate as a gummy mass. This material was used as such for the next step. LCMS (method 1): Rt=0.94 min, m/z=309 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 0.74-0.79 (m, 2H) 1.06-1.12 (m, 2H) 1.31 (t, 3H) 1.94-2.01 (m, 1H) 3.62 (q, 2H) 4.04 (s, 3H) 7.24 (dd, 1H) 8.21 (d, 1H) 8.33 (s, 1H).
To a solution of methyl 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-11 prepared as described above) (0.20 g, 0.6 mmol) in tetrahydrofuran (4 mL) was added a solution of lithium hydroxide monohydrate (0.02 g, 1.0 mmol) in water (1 mL). The reaction mixture was stirred at room temperature for 1.5 hours, then concentrated in vacuo. Water was added to the residue and the mixture was acidified with aqueous 2N hydrochloric acid. The aqueous layer was extracted with ethyl acetate (3×30 mL), dried over sodium sulfate, filtered and concentrated in vacuo to afford 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridine-2-carboxylic acid as a gummy mass. This material was used as such in the next step. LCMS (method 2): Rt=0.43 min, m/z=295 (M+H)+.
To a solution of 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridine-2-carboxylic acid (intermediate I-12 prepared as described above) (0.20 g, 0.7 mmol) in tert-butanol (2 mL) was added triethylamine (0.15 mL, 1.1 mmol) at room temperature. The reaction mass was heated at 90° C. and diphenylphosphoryl azide (0.25 mL, 1.1 mmol) was added dropwise over a period of 5 minutes. The reaction mixture was stirred at 90° C. for 30 minutes. The reaction mass was allowed to cool to room temperature, quenched with ice cold water and the mixture was extracted with ethyl acetate (2×30 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by purified by combiflash (silica gel, 0-50% ethyl acetate in cyclohexane) to afford pure tert-butyl N-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)carbamate and 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-amine. LCMS (method 2) for tert-butyl N-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)carbamate (intermediate 1-13): Rt 1.52 min, m/z=310 [(M+H)+−56]. LCMS (method 2) for 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-amine (intermediate 1-14): Rt=1.15 min. m/z=266 (M+H)+.
To a 0° C. cooled solution of 6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-amine (intermediate 1-14 prepared as described above) (0.11 g, 0.41 mmol) in N,N-dimethylformamide (2 mL) was added sodium hydride (0.04 g, 0.9 mmol). The reaction mixture was stirred at 0° C. for one hour. A solution of tert-butoxycarbonyl tert-butyl carbonate (0.11 g, 0.5 mmol) in N,N-dimethylformamide (2 mL) was added at 0° C. The reaction mass was stirred at room temperature overnight. The reaction mixture was quenched with ice water followed by saturated aqueous ammonium chloride, and the mixture was extracted with ethyl acetate (3×30 mL). The combined organic layers were washed with water (100 mL) and brine (100 mL), dried over sodium sulfate, filtered and concentrated in vacuo to afford tert-butyl N-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)carbamate as a solid. This material was used as such in the next step. LCMS (method 2): Rt=1.50 min, m/z=310 [(M+H)+−56].
To a solution of tert-butyl N-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)carbamate (intermediate 1-13 prepared as described above) (0.16 g, 0.4 mmol) in acetonitrile (5 mL) were added ethyl 2-(bromomethyl)-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-55) (0.32 g, 0.6 mmol) and cesium carbonate (0.21 g, 0.7 mmol) at room temperature. The reaction mixture was stirred at 50° C. for 2.5 hours, then quenched with ice cold water and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford pure ethyl 2-[[tert-butoxycarbonyl-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate as a gummy mass. LCMS (method 1): Rt=1.25 min, m/z=598 (M+H)+.
To a 0° C. cooled solution of ethyl 2-[[tert-butoxycarbonyl-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-15 prepared as described above) (0.13 g, 0.2 mmol) in trifluoromethylbenzene (2 mL) was added 2,2,2-trifluoroacetic acid (0.26 mL, 3.4 mmol). The reaction mixture was stirred at room temperature for 9 hours. The reaction mass was concentrated in vacuo, diluted with water (30 mL), and neutralised with an aqueous sodium bicarbonate solution. The aqueous layer was extracted with ethyl acetate (2×50 mL), the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford pure ethyl 2-[[(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate as an off white solid. LCMS (method 1): Rt=1.22 min, m/z=495 (M−H)−.
To a solution of ethyl 2-[[(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-16 prepared as described above) (0.07 g, 0.1 mmol) in methanol (0.7 mL) was added a solution of barium hydroxide octahydrate (0.11 g, 0.4 mmol) in water (0.4 mL) at 0-10° C. The reaction mixture was stirred at room temperature for 6 hours, then concentrated in vacuo. Water was added to the residue and the mixture was acidified with aqueous 2N hydrochloric acid. The aqueous layer was extracted with ethyl acetate (3×30 mL), the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford 2-[[(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid. This material was used as such in the next step. LCMS (method 1): Rt=1.09 min, m/z=469 (M+H)+.
To a 0° C. cooled solution of 2-[[(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid (intermediate 1-17 prepared as described above) (0.05 g, 0.1 mmol) in pyridine (0.2 mL) was added phosphorus oxychloride (0.03 g, 0.2 mmol) dropwise. The reaction mixture was stirred at 0 to 10° C. for 20 minutes. After completion, the mixture was quenched with ice water (80 mL) and extracted with ethyl acetate (3×25 mL). The combined organic layers were washed with brine (25 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford pure 6-(6-cyclopropyl-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl)-3-(trifluoromethyl)-7H-pyrrolo[3,4-b]pyridin-5-one (Compound P1) as a solid. LCMS (method 1): Rt=1.11 Min, m/z=451 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 0.78 (br d, 2H) 1.07-1.13 (m, 2H) 1.40 (t, 3H) 1.96-2.04 (m, 1H) 3.55 (q, 2H) 5.14 (s, 2H) 7.29 (d, 1H) 7.98 (d, 1H) 8.28 (s, 1H) 8.47 (s, 1H) 9.11 (s, 1H).
To a solution of 2-amino-5-(trifluoromethoxy)benzoic acid (5.0 g, 23 mmol) in N,N-dimethylformamide (50 mL) were added potassium carbonate (6.3 g, 45 mmol) and iodomethane (1.4 mL, 23 mmol) at room temperature. The reaction mixture was stirred overnight at room temperature. The reaction mass was quenched with water (300 mL) and extracted with ethyl acetate (3×100 mL). The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0-10% ethyl acetate in cyclohexane) to afford methyl 2-amino-5-(trifluoromethoxy)benzoate. LCMS (method 2): Rt=1.46 min, m/z=236 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 3.89 (s, 3H), 5.80 (br s, 2H), 6.66 (d, 1H), 7.15 (ddt, 1H), 7.73 (d, 1H).
To a 0° C. cooled solution of methyl 2-amino-5-(trifluoromethoxy)benzoate (intermediate 1-18 prepared as described above) (7.3 g, 31 mmol) in hydrobromic acid (48% in water, 73 mL) was added dropwise a solution of sodium nitrite (4.3 g, 62 mmol) in water (22 mL). The reaction mixture was stirred at 0° C. for 30 minutes, before copper(I) bromide (8.0 g, 56 mmol) was added. The reaction mixture was stirred for additional 30 minutes at 0° C., and then at room temperature for 5 hours. The reaction mixture was diluted with water (100 mL) and extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0-8% ethyl acetate in cyclohexane) to afford methyl 2-bromo-5-(trifluoromethoxy)benzoate. 1H NMR (400 MHz, CDCl3) δ ppm: 3.96 (s, 3H), 7.22 (m, 1H), 7.66-7.73 (m, 2H).
In a flask were charged methyl 2-bromo-5-(trifluoromethoxy)benzoate (intermediate 1-19 prepared as described above) (5.3 g, 18 mmol), methylboronic acid (3.3 g, 53 mmol), tripotassium phosphate (11 g, 53 mmol), tricyclohexylphosphane (0.50 g, 1.8 mmol), followed by toluene (64 mL) and water (11 mL). The flask was purged with nitrogen for 10 minutes, before adding palladium(II) acetate (0.20 g, 0.89 mmol) and continuing purging for additional 10 minutes. The reaction mixture was heated up to 100° C. and stirred for 3 hours. The reaction mixture was quenched with water (50 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 100% cyclohexane) to afford methyl 2-methyl-5-(trifluoromethoxy)benzoate. 1H NMR (400 MHz, CDCl3) δ ppm: 2.61 (s, 3H), 3.92 (s, 3H), 7.29 (m, 2H), 7.78 (s, 1H).
To a solution of methyl 2-methyl-5-(trifluoromethoxy)benzoate (intermediate 1-20 prepared as described above) (1.9 g, 8.1 mmol) in tetrachloromethane (65 mL) were added N-bromosuccinimide (2.0 g, 11 mmol) and benzoyl peroxide (0.70 g, 2.0 mmol) at room temperature. The reaction mixture was heated up to 70° C. and stirred for 3 hours. After cooling down to room temperature, the reaction mixture was diluted with ice cold water (100 mL) and extracted with dichloromethane (3×50 mL). The combined organic layers were washed with brine (50 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 5-10% ethyl acetate in cyclohexane) to afford methyl 2-(bromomethyl)-5-(trifluoromethoxy)benzoate. H NMR (400 MHz, CDCl3) δ ppm: 3.97 (s, 3H), 4.95 (s, 2H), 7.50-7.56 (m, 1H), 7.83 (d, 1H), 8.07-8.12 (m, 1H).
To 0° C. cooled solution of Ethyl N-(mesitylsulfonyl)oxyacetimidate (5.00 g, 17.5 mmol) in 1,4-dioxane (20 mL) was added perchloric acid (15.1 mL, 175.2 mmol) dropwise. The reaction mixture was stirred for 15 minutes at 0° C. Ice cold water (100 mL) was added to the reaction mass and extracted with trifluoromethylbenzene (3×40 mL). The combined organic layers were dried over sodium sulfate, filtered and, this freshly prepared solution of amino 2,4,6-trimethylbenzenesulfonate (1-22a) in trifluoromethylbenzene (120 mL) was added dropwise to a solution of 4-(trifluoromethyl)pyridine (3.00 g, 21 mmol) in trifluoromethylbenzene (10 mL) at room temperature. The reaction mixture was stirred at room temperature for 24 hours. A white solid was precipitated, filtered, the solid obtained was washed with methyl tert-butyl ether (2×100 mL), dried in vacuo to afford 4-(trifluoromethyl)pyridin-1-ium-1-amine;2,4,6-trimethylbenzenesulfonate as a white solid. This material was used as such immediately in the next step. LCMS (method 2): Rt=0.29 min, m/z=163 (M)+.
To a solution of 4-(trifluoromethyl)pyridin-1-ium-1-amine;2,4,6-trimethylbenzenesulfonate (intermediate 1-22 prepared as described above) (20.00 g, 55.19 mmol) in tetrahydrofuran (400 mL) was added a solution of dimethyl but-2-ynedioate (11.76 g, 82.78 mmol) in tetrahydrofuran (10 mL) at −10° C. A solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (16.83 mL, 110.4 mmol) in tetrahydrofuran (20 mL) was added to the reaction mass dropwise over a period of 30 minutes at −10° C. The reaction mass was stirred at room temperature for 16 hours, then concentrated in vacuo. Ethyl acetate (300 ml) was added to the residue and the mixture was washed with water (2×400 mL) followed by brine (400 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 5% ethyl acetate in cyclohexane) to afford dimethyl 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2,3-dicarboxylate as a white solid. LCMS (method 2): Rt=1.43 min, m/z=303 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 3.97 (s, 3H) 4.05 (s, 3H) 7.22 (dd, 1H) 8.50 (s, 1H) 8.64 (d, 1H).
To a solution of dimethyl 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2,3-dicarboxylate (intermediate 1-23 prepared as described above) (13.00 g, 43.0 mmol) in 1,4-dioxane (52 mL) was added 50% aqueous sulfuric acid (120 mL, 860.33 mmol) at room temperature. The reaction mixture was heated at 110° C. for 20 hours. The reaction mixture was quenched with ice cold water (100 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with brine (50 mL), dried over sodium sulfate, filtered and concentrated in vacuo to afford 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylic acid as a white solid. This material was used as such in the next step. LCMS (method 2): Rt=1.25 min, m/z=231 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm: 7.31-7.32 (m, 2H) 8.32-8.38 (m, 1H) 8.97 (d, 1H).
To a solution of 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylic acid (intermediate 1-24 prepared as described above) (8.00 g, 34.7 mmol) in dimethyl sulfoxide (40 mL) was added potassium carbonate (9.60 g, 69.5 mmol) at room temperature. Iodoethane (5.59 mL, 69.5 mmol) was added dropwise to the reaction mass at room temperature. The reaction mixture was stirred at room temperature under nitrogen atmosphere for 12 hours. The reaction mass was diluted with ice water (200 mL) and extracted with ethyl acetate (2×300 mL). The combined organic layers were washed with brine (100 mL), dried over sodium sulfate, filtered and concentrated in vacuo to afford ethyl 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate as white solid. This material was used as such in the next step. LCMS (method 2): Rt=1.46 min, m/z=259 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.46 (t, 3H) 4.50 (q, 2H) 7.06 (dd, 1H) 7.28 (s, 1H) 7.95 (s, 1H) 8.51-8.71 (m, 1H).
To a solution of ethyl 5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-25 prepared as described above) (7.50 g, 29.0 mmol) in acetonitrile (75 mL) was added portion wise 1-iodopyrrolidine-2,5-dione (9.8 g, 43.5 mmol) at room temperature. The reaction mixture was stirred at 60° C. for 18 hours. The reaction mixture was cooled to room temperature, diluted with water (200 mL), and the mixture was extracted with ethyl acetate (3×500 mL). The combined organic layers were washed with saturated aqueous sodium thiosulphate (100 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude compound was purified by combiflash (silica gel, 20% ethyl acetate in cyclohexane) to afford pure ethyl 3-iodo-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate as a white solid. LCMS (method 2): Rt=1.58 min, m/z=385 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.50 (t, 3H) 4.54 (q, 2H) 7.12 (dd, 1H) 7.92-7.95 (m, 1H) 8.63 (d, 1H)
To a solution of ethyl 3-iodo-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-26 prepared as described above) (7.00 g, 18.22 mmol) in anhydrous 1,4-dioxane (140 mL) were added ethanethiol (3.4 mL, 45.56 mmol), N-ethyl-N-isopropyl-propan-2-amine (6.14 g, 47.38 mmol), tris(dibenzylideneacetone)dipalladium(0) (1.20 g, 1.27 mmol) and (5-diphenylphosphanyl-9,9-dimethyl-xanthen-4-yl)-diphenyl-phosphane (0.84 g, 1.45 mmol) at room temperature. The reaction mixture was stirred at 110° C. for one hour under nitrogen atmosphere. After completion, the reaction mass was diluted with water (200 mL) and extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford ethyl 3-ethylsulfanyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate as a solid. This material was used as such in the next step. LCMS (method 2): Rt=1.60 min, m/z=319 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.11 (t, 3H) 1.41 (t, 3H) 2.85 (q, 2H) 4.47 (q, 2H) 7.03 (dd, 1H) 8.01-8.13 (m, 1H) 8.53 (d, 1H).
To a solution of ethyl 3-ethylsulfanyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-27 prepared as described above) (6.00 g, 18.85 mmol) in trifluoromethylbenzene (120 mL) was added 3-chloroperoxybenzoic acid (10.22 g, 41.47 mmol, 70 mass %) at room temperature under nitrogen atmosphere. The reaction mass was stirred at room temperature for 12 hours. The reaction mixture was diluted with water (200 mL) and extracted with ethyl acetate (3×200 mL). The combined organic layers were washed with an aqueous saturated sodium bicarbonate solution (3×200 mL) followed by brine (200 mL), dried over sodium sulfate and concentrated in vacuo to afford ethyl 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate as a white solid. This material was used as such for the next step. LCMS (method 2): Rt=1.43 min, m/z=351 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.37 (t, 3H) 1.49 (t, 3H) 3.68 (q, 2H) 4.56 (q, 2H) 7.30 (dd, 1H) 8.52-8.77 (m, 2H)
To a solution of ethyl 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylate (intermediate 1-28 prepared as described above) (6.50 g, 18.56 mmol) in tetrahydrofuran (130 mL) was added a solution of lithium hydroxide monohydrate (1.16 g, 27.83 mmol) in water (32 mL) at room temperature. The reaction mass was stirred at room temperature for 4 hours, then concentrated in vacuo. Water (500 mL) was added to the residue, washed with ethyl acetate (100 mL). The aqueous layer was acidified with an aqueous 2N hydrochloric acid. A white solid was precipitated and the solid was filtered and dried in vacuo to afford 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylic acid as white solid. This material was used as such in the next step. LCMS (method 2): Rt=1.23 min, m/z=323 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm: 1.19 (t, 3H) 3.62 (q, 2H) 7.62 (dd, 1H) 8.29-8.48 (m, 1H) 9.20 (d, 1H).
To a solution of 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridine-2-carboxylic acid (intermediate 1-29 prepared as described above) (1.00 g, 3.1 mmol) in tert-butanol (10 mL) was added triethylamine (0.70 mL, 4.96 mmol) at room temperature. The reaction mass was heated at 90° C. and diphenylphosphoryl azide (1.12 mL, 4.96 mmol) was added dropwise over a period of 10 minutes. The reaction mixture was stirred at 90° C. for one hour. The reaction mass was allowed to cool to room temperature. The reaction mass was quenched with ice cold water (200 mL), extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 30% ethyl acetate in cyclohexane) to afford 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-amine as a white solid. LCMS (method 2): Rt=1.24 min, m/z=294 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.36 (t, 3H) 3.21 (q, 2H) 5.05 (br s, 2H) 7.03 (dd, 1H) 7.89-8.06 (m, 1H) 8.36 (d, 1H).
To a 0° C. cooled solution of 3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-amine (intermediate 1-30 prepared as described above) (0.33 g, 1.12 mmol) in N,N-dimethylformamide (3 mL) was added sodium hydride (0.10 g, 2.58 mmol) portion wise under nitrogen atmosphere. The reaction mixture was stirred at 0° C. for one hour. A solution of tert-butoxycarbonyl tert-butyl carbonate (0.29 g, 1.35 mmol) in N,N-dimethylformamide (2 mL) was added dropwise to the reaction mass at 0° C. The reaction mixture was stirred at room temperature under nitrogen atmosphere for 12 hours. The reaction mass was quenched with ice water (20 mL) followed by a solution of saturated ammonium chloride (20 mL), and the mixture was extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with water (100 mL) and brine (100 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 20% ethyl acetate in cyclohexane) to afford tert-butyl N-[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate as a white solid. LCMS (method 2): Rt=1.52 min, m/z=392 (M−H)−. 1H NMR (400 MHz, CDCl3) δ ppm: 1.35 (t, 3H) 1.57 (s, 9H) 3.24 (q, 2H) 7.15 (dd, 1H) 8.01-8.20 (m, 1H) 8.29 (s, 1H) 8.69 (d, 1H).
To a stirred solution of tert-butyl N-[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate (intermediate 1-31 prepared as described above) (0.25 g, 0.63 mmol) in acetonitrile (5 mL) were added methyl 2-(bromomethyl)-5-(trifluoromethoxy)benzoate (intermediate 1-21 prepared as described above) (0.25 g, 0.82 mmol) and cesium carbonate (0.31 g, 0.95 mmol) at room temperature. The reaction mass was stirred at 50° C. for 2.5 hours under nitrogen atmosphere, then quenched with ice cold water (100 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford methyl 2-[[tert-butoxycarbonyl-[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoate as gummy mass. This material was used as such in the next step. LCMS (method 1): Rt=1.28 Min, m/z=526 [(M+H)+−100]. 1H NMR (400 MHz, CDCl3) δ ppm: 1.36-146 (m, 11H) 3.33-3.66 (m, 2H) 3.90 (s, 3H) 5.40 (s, 2H) 7.14 (dd, 1H) 7.41 (dd, 1H) 7.80 (s, 1H) 8.01 (d, 1H) 8.32 (s, 1H) 8.47 (d, 1H).
To a 0° C. cooled solution of methyl 2-[[tert-butoxycarbonyl-[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoate (intermediate I-32 prepared as described above) (0.40 g, 0.63 mmol) in trifluoromethylbenzene (4 mL) was added 2,2,2-trifluoroacetic acid (0.51 mL, 6.39 mmol) dropwise. Reaction mass was stirred at room temperature for 16 hours. The reaction mass was concentrated in vacuo, diluted with water (30 mL), and neutralised with an aqueous sodium bicarbonate solution. The aqueous layer was extracted with ethyl acetate (2×50 mL), the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo to afford methyl 2-[[[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoate as a white solid. This material was used as such in the next step. LCMS (method 2): Rt=1.66 min, m/z=526 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.30 (t, 3H) 3.10-3.25 (m, 2H) 3.98 (s, 3H) 4.87 (d, 2H) 6.44 (t, 1H) 6.97 (dd, 1H) 7.30-7.36 (m, 1H) 7.64 (d, 1H) 7.80-7.85 (m, 1H) 7.90-7.96 (m, 1H) 8.35 (d, 1H).
To a solution of methyl 2-[[[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoate (intermediate 1-33 prepared as described above) (0.350 g, 0.66 mmol) in methanol (3.5 mL) was added a solution of barium hydroxide octahydrate (0.52 g, 1.66 mmol) in water (1.75 mL) at 0-10° C. The reaction mixture was stirred at 40° C. for 8 hours, then concentrated in vacuo. Water (20 mL) was added to the residue and the mixture was acidified with aqueous 2N hydrochloric acid. The aqueous layer was extracted with ethyl acetate (3×100 mL), the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford 2-[[[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoic acid as a solid. This material was used as such in the next step. LCMS (method 2): Rt=1.57 min, m/z=512 (M+H)+.
To 0° C. cooled solution of 2-[[[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethoxy)benzoic acid (intermediate 1-34 prepared as described above) (0.40 g, 0.782 mmol) in pyridine (2 mL) was added phosphorus oxychloride (0.14 mL, 1.56 mmol) dropwise under nitrogen atmosphere. The reaction mixture was stirred at 0 to 10° C. for 20 minutes. The reaction mass was quenched with ice cold water (80 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with brine (100 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford pure 2-[3-ethylsulfonyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]-6-(trifluoromethoxy)isoindolin-1-one (P2) as white solid. LCMS (method 2): Rt=1.57 Min, m/z=494 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm: 1.45 (t, 3H) 3.68 (q, 2H) 5.06 (s, 2H) 7.24-7.27 (m, 1H) 7.66-7.76 (m, 2H) 7.82 (s, 1H) 8.43 (s, 1H) 8.61 (d, 1H).
To a 0° C. cooled solution of 2-(6-chloro-3-pyridyl)acetonitrile (CAS 39891-09-3) (8.0 g, 52.43 mmol) in tetrahydrofuran (100 mL) was added sodium hydride (5.24 g, 131.08 mmol) portion wise under nitrogen atmosphere and the reaction mass was stirred at 0° C. for 10 minutes. And then, to this reaction mass 1,2-dibromoethane (10.9 mL, 125.84 mmol) was added dropwise over a period of 20 minutes and the reaction mass was stirred at room temperature for 1 hour. The reaction mixture was quenched with ice cold water and extracted with ethyl acetate (2×100 mL). The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The obtained residue was triturated with n-pentane and dried in vacuo to afford 1-(6-chloro-3-pyridyl)cyclopropanecarbonitrile as a dark brown solid. This material was used as such in the next step. LCMS (method 1): Rt=0.95 min, m/z=179/181 (M+H)+.
To a solution 1-(6-chloro-3-pyridyl)cyclopropanecarbonitrile (intermediate 1-56 prepared as described above) (16.0 g, 89.576 mmol) in toluene (100 mL) was added tert-butyl 2-cyanoacetate (14.340 g 98.533 mmol) followed by addition of potassium tert-butoxide (16.929 g, 143.32 mmol) at room temperature under nitrogen atmosphere, and the reaction mass was degassed with nitrogen for 5 minutes. Then to this, 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (4.43 g, 5.3745 mmol) was added at room temperature and the reaction mixture was stirred at 80° C. for 17 hours. The reaction mass was quenched with ice cold water, neutralized with a 1 N hydrochloric acid solution, and extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with water, followed by brine, dried over sodium sulphate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford tert-butyl 2-cyano-2-[5-(1-cyanocyclopropyl)-2-pyridyl]acetate as a yellow solid. LCMS (method 1): Rt=1.04 min, m/z=282 (M−H)−
To a solution of tert-butyl 2-cyano-2-[5-(1-cyanocyclopropyl)-2-pyridyl]acetate (intermediate 1-57 prepared as described above) (9.8 g, 35 mmol) in acetonitrile (98 mL) was added 4-methylbenzenesulfonic acid (3.0 g, 17 mmol) at room temperature and the reaction mass was stirred at 87° C. for 5 hours. The reaction mixture was concentrated in vacuo, quenched with water (200 mL) and extracted with ethyl acetate (2×100 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0-80% ethyl acetate in cyclohexane) to afford 1-[6-(cyanomethyl)-3-pyridyl]cyclopropanecarbonitrile as a brown gummy mass. LCMS (method 1): Rt=0.92 min. m/z=184 (M+H)+.
To a solution of ethyl N-(mesitylsulfonyl)oxyacetimidate (5.0 g, 17.52 mmol) in 1,4-dioxane (15 mL) was added perchloric acid (2.14 mL, 21.34 mmol) at 0° C. and stirred for 30 minutes. Ice cold water was added to the reaction mass and extracted with dichloromethane (2×25 mL). The combined organic layers were dried over sodium sulfate, filtered and, to this freshly prepared solution of amino 2,4,6-trimethylbenzenesulfonate (1-22a) in dichloromethane (50 mL) was added 1-[6-(cyanomethyl)-3-pyridyl]cyclopropanecarbonitrile (intermediate 1-58 prepared as described above) (2.1380 g, 11.66951 mmol) dropwise at room temperature. The reaction mixture was stirred at room temperature for 16 hours. After completion, the reaction mass was used as such in the next step. LCMS (method 1): Rt=0.83 min, m/z=199 (M)+.
To a freshly prepared solution of 1-[1-amino-6-(cyanomethyl)pyridin-1-ium-3-yl]cyclopropanecarbonitrile;2,4,6-trimethylbenzenesulfonate (intermediate 1-59 prepared as described above) (6.98 g, 17.5 mmol) in dichloromethane (50 mL) were added methanol (34.9 mL) and potassium carbonate (4.84 g, 35.0 mmol) at room temperature. The reaction mass was stirred at room temperature for 12 hours. After completion, the reaction mass was concentrated to half volume in vacuo (temperature of the rota vapour water bath was kept below 40° C.). The reaction mass was quenched with ice cold water (200 mL) and ethyl acetate (100 mL), separated both the layers and the aqueous layer was extracted with ethyl acetate (2×80 mL). The combined organic layers were washed with water, dried over sodium sulphate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 100% ethyl acetate in cyclohexane) to afford 1-(2-aminopyrazolo[1,5-a]pyridin-6-yl)cyclopropanecarbonitrile as a brown oily mass. LCMS (method 1): Rt=0.87 min. m/z=199 (M+H)+.
To a 0° C. cooled solution of 1-(2-aminopyrazolo[1,5-a]pyridin-6-yl)cyclopropanecarbonitrile (intermediate 1-60 prepared as described above) (1.172 g, 5.91 mmol) in pyridine (15 mL) was added acetyl chloride (0.643 mL, 8.86 mmol) drop wise under nitrogen atmosphere. The reaction mixture was stirred at 0-10° C. for 1 hour. After completion, the reaction mixture was diluted with ethyl acetate and water, separated both the layers and the aqueous layer was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water, dried over sodium sulphate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 100% ethyl acetate in cyclohexane) to afford N-[6-(1-cyanocyclopropyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide as a brown solid. LCMS (method 1): Rt=0.92 min, m/z=241 (M+H)+.
To a solution of N-[6-(1-cyanocyclopropyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide (intermediate 1-61 prepared as described above) (0.995 g, 4.14 mmol) in acetonitrile (9.95 mL) was added 1-iodopyrrolidine-2,5-dione (1.12 g, 4.97 mmol) portion wise and the reaction mass was stirred at room temperature for 2.5 hours. After completion, the reaction mass was diluted with water and extracted with ethyl acetate (2×). The combined organic layers were washed with sodium thiosulfate solution followed by brine, dried over sodium sulphate, filtered and concentrated in vacuo to afford N-[6-(1-cyanocyclopropyl)-3-iodo-pyrazolo[1,5-a]pyridin-2-yl]acetamide as a solid. This material was used as such in the next step. LCMS (method 1): Rt=0.99 min, m/z=367 (M+H)+.
To a solution of N-[6-(1-cyanocyclopropyl)-3-iodo-pyrazolo[1,5-a]pyridin-2-yl]acetamide (intermediate I-62 prepared as described above) (1.48 g, 4.04 mmol) in acetonitrile (15 mL) were added N,N-dimethylpyridin-4-amine (0.050 g, 0.404 mmol) followed by di-tert-butyl dicarbonate (1.09 g, 4.85 mmol) at 0-10° C. The reaction mass was stirred at room temperature for 2 hours. After completion, the reaction mass was concentrated in vacuo, and then the reaction mass was quenched with ice cold water, extracted with ethyl acetate (3×50 mL). The combined organic layers were washed with a saturated sodium bicarbonate solution, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 30% ethyl acetate in cyclohexane) to afford tert-butyl N-acetyl-N-[6-(1-cyanocyclopropyl)-3-iodo-pyrazolo[1,5-a]pyridin-2-yl]carbamate as a white solid. LCMS (method 1): Rt=1.19 min, m/z=367 [(M+H)−100]+.
To a solution of tert-butyl N-acetyl-N-[6-(1-cyanocyclopropyl)-3-iodo-pyrazolo[1,5-a]pyridin-2-yl]carbamate intermediate 1-63 prepared as described above (1.43 g, 3.07 mmol) in dry 1,4-dioxane (20 mL) were added N-ethyl-N-isopropyl-propan-2-amine (1.36 mL, 7.97 mmol) and (5-diphenylphosphanyl-9,9-dimethyl-xanthen-4-yl)-diphenyl-phosphane (0.142 g, 0.245 mmol), then the mixture was degassed with nitrogen for 5 minutes. Tris(dibenzylideneacetone)dipalladium(0) (0.197 g, 0.215 mmol) was added and the solution was degassed with nitrogen for 5 minutes. Sodium ethanethiolate (0.532 g, 6.13 mmol) was added and the solution was further degassed with nitrogen for 5 minutes. Then, the reaction mixture was stirred at 110° C. for 5 hours, then at 80° C. for 1 hour under nitrogen atmosphere. The reaction was diluted with ethyl acetate, filtered over a celite pad, and washed with ethyl acetate. The filtrate was washed with brine. Then, the aqueous layer was washed with ethyl acetate, and the combined organic layers were dried over sodium sulfate filtered and concentrated in vacuo. The crude material was purified by combiflash (silica gel, 0-20% ethyl acetate in cyclohexane) to afford tert-butyl N-[6-(1-cyanocyclopropyl)-3-ethylsulfanyl-pyrazolo[1,5-a]pyridin-2-yl]carbamate. LCMS (method 1): Rt=1.15 min, m/z=359 (M+H)+.
To a solution of tert-butyl N-[6-(1-cyanocyclopropyl)-3-ethylsulfanyl-pyrazolo[1,5-a]pyridin-2-yl]carbamate (intermediate 1-44 prepared as described above) (1.29 g, 3.60 mmol) in acetonitrile (20 mL) was added 3-chlorobenzenecarboperoxoic acid (70 mass %, 1.95 g, 7.92 mmol) at 0° C. The reaction mass was stirred at 0° C. for 1.5 hours. Then, the solvent was distilled off below 25° C. and the residue was quenched with an aqueous 2N sodium hydroxide solution and water (60 mL). Ethyl acetate (40 mL) was added and the organic layer was separated. The aqueous layer was extracted twice with ethyl acetate (2×50 mL). Combined organic layers were washed with brine (60 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified by combiflash (silica gel, 0-20% ethyl acetate in cyclohexane) to afford pure tert-butyl N-[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]carbamate as an off white solid. LCMS (method 1): Rt=1.15 min, m/z=391 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.17 (t, J=7.34 Hz, 3H) 1.46 (s, 9H) 1.62-1.67 (m, 2H) 1.73-1.78 (m, 2H) 3.43 (q, J=7.25 Hz, 2H) 7.69 (dd, J=9.29, 1.59 Hz, 1H) 7.86 (d, J=9.29 Hz, 1H) 8.85 (s, 1H) 9.30 (s, 1H).
To a solution of tert-butyl N-[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]carbamate (intermediate 1-43 prepared as described above) (0.73 g, 1.87 mmol) in acetonitrile (10 mL) was added cesium carbonate (0.79 g, 2.43 mmol), followed by ethyl 2-(bromomethyl)-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-55) (0.95 g, 2.43 mmol). The reaction mass was stirred at 50° C. for 2.5 hours, then quenched with ice cold water and the product extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford ethyl 2-[[tert-butoxycarbonyl-[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate as a gummy mass. This material was used as such in the next step. LCMS (method 1): Rt=1.23 Min, m/z=623 (M+H)+.
To a 0° C. cooled solution of ethyl 2-[[tert-butoxycarbonyl-[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-45 prepared as described above) (1.64 g, 2.64 mmol) in trifluoromethylbenzene (10 mL) was added 2,2,2-trifluoroacetic acid (3.19 mL, 39.6 mmol) dropwise. The reaction mass was stirred at room temperature for 12 hours. The mixture was concentrated in vacuo, diluted with water (50 mL), and neutralized with an aqueous sodium bicarbonate solution (30 mL). The aqueous layer was extracted with ethyl acetate (2×50 mL), the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified by combiflash (silica gel, 0-30% ethyl acetate in cyclohexane) to afford ethyl 2-[[[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate as a white solid. LCMS (method 1): Rt=1.26 min, m/z=522 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.17 (t, J=7.25 Hz, 3H) 1.38 (t, J=7.13 Hz, 3H) 1.57-1.61 (m, 2H) 1.67-1.72 (m, 2H) 3.25 (q, J=7.25 Hz, 2H) 4.41 (q, J=7.13 Hz, 2H) 5.04 (d, J=5.38 Hz, 2H) 6.84 (t, J=5.50 Hz, 1H) 7.56-7.63 (m, 2H) 8.53 (d, J=1.88 Hz, 1H) 8.65-8.67 (m, 1H) 9.16 (d, J=1.38 Hz, 1H).
To a solution of ethyl 2-[[[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-46 prepared as described above) (0.754 g, 1.45 mmol) in tetrahydrofuran (10 mL) was added lithium hydroxide monohydrate (0.255 g, 5.78 mmol) in water (3.5 mL) at room temperature. The reaction mass was stirred at room temperature overnight. Additional lithium hydroxide monohydrate (0.064 g, 1.45 mmol) was added and the reaction was further stirred until completion. The reaction mass was concentrated in vacuo, acidified with aqueous 1 N hydrochloric acid, extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water (50 mL), then brine, dried over sodium sulfate, filtered and concentrated in vacuo to afford the crude product, 2-[[[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid as an off white solid. The crude was used as such for next step. LCMS (method 1): Rt=1.10 min, m/z=494 (M+H)+.
To a 0° C. cooled solution of 2-[[[6-(1-cyanocyclopropyl)-3-ethylsulfonyl-pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid (intermediate 1-47 prepared as described above) (0.70 g, 1.43 mmol) in pyridine (3.52 mL) was added phosphorus oxychloride (0.268 mL, 2.85 mmol) dropwise under a nitrogen atmosphere. The reaction mixture was stirred at 0 to 10° C. for 30 minutes, then quenched with ice cold water (60 mL) and the product extracted with ethyl acetate (3×25 mL). The combined organic layers were washed with brine (30 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 30% ethyl acetate in cyclohexane) to afford pure 1-[3-ethylsulfonyl-2-[5-oxo-3-(trifluoromethyl)-7H-pyrrolo[3,4-b]pyridin-6-yl]pyrazolo[1,5-a]pyridin-6-yl]cyclopropanecarbonitrile as a white solid. LCMS (method 1): Rt=1.14 min, m/z=476 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm 1.42 (t, J=7.40 Hz, 3H) 1.49-1.53 (m, 2H) 1.86-1.91 (m, 2H) 3.60 (q, J=7.38 Hz, 2H) 5.16 (s, 2H) 7.41 (dd, J=9.41, 1.71 Hz, 1H) 8.11 (d, J=8.80 Hz, 1H) 8.48 (d, J=1.59 Hz, 1H) 8.56-8.59 (m, 1H) 9.11-9.14 (m, 1H).
To a solution of 2-chloro-5-(trifluoromethyl)pyridine (CAS 52334-81-3) (16.0 g, 88.1 mmol) in dimethyl sulfoxide (80 mL) was added potassium carbonate (18.3 g, 132 mmol) followed by tert-butyl 2-cyanoacetate (14.9 g, 106 mmol) at room temperature and the reaction mass was stirred at 100° C. for 5 hours. The reaction mass was quenched with ice cold water and stirred for 10 minutes. A solid was precipitated, filtered and dried in vacuo. The obtained solid was washed with n-pentane and dried in vacuo to afford tert-butyl 2-cyano-2-[5-(trifluoromethyl)-2-pyridyl]acetate as a yellow solid. This material was used as such in the next step. LCMS (method 1): Rt=1.13 min, m/z=285 (M−H)−.
To a solution of tert-butyl 2-cyano-2-[5-(trifluoromethyl)-2-pyridyl]acetate (intermediate 1-64 prepared as described above) (17.95 g, 62.72 mmol) in acetonitrile (179 mL) was added 4-methylbenzenesulfonic acid (5.45 g, 31.36 mmol) at room temperature and the reaction mass was stirred at 87° C. for 1 hour. The reaction mixture was concentrated in vacuo, quenched with water (200 mL) and extracted with ethyl acetate (2×100 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 20% ethyl acetate in cyclohexane) to afford 2-[5-(trifluoromethyl)-2-pyridyl]acetonitrile as a faint yellow oil. LCMS (method 1): Rt=1.00 min, m/z=187 (M+H)+.
To a solution of ethyl N-(mesitylsulfonyl)oxyacetimidate (5.0 g, 17.52 mmol) in 1,4-dioxane (15 mL) was added perchloric acid (2.14 mL, 21.34 mmol) at 0° C. and stirred for 30 minutes. Ice cold water was added to the reaction mass and extracted with dichloromethane (2×25 mL). The combined organic layers were dried over sodium sulfate, filtered and, to this freshly prepared solution of amino 2,4,6-trimethylbenzenesulfonate (1-22a) in dichloromethane (50 mL) was added 2-[5-(trifluoromethyl)-2-pyridyl]acetonitrile (intermediate 1-65 prepared as described above) (2.17 g, 11.66951 mmol) dropwise at room temperature. The reaction mixture was stirred at room temperature for 16 hours. After completion, the reaction mass was used as such in the next step. LCMS (method 1): Rt=0.96 min, m/z=202 (M)+.
Step-4: Preparation of 6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-amine (Intermediate 1-67)
To a freshly prepared solution of 2-[1-amino-5-(trifluoromethyl)pyridin-1-ium-2-yl]acetonitrile;2,4,6-trimethylbenzenesulfonate (intermediate 1-66 prepared as described above) (7.0 g, 17.44 mmol) in dichloromethane (50 mL) were added methanol (35 mL) and potassium carbonate (4.82 g, 34.88 mmol) at room temperature. The reaction mass was stirred at room temperature for 4 hours. The reaction mass was quenched with ice cold water (200 mL), separated both the layers and the aqueous layer was extracted with ethyl acetate (2×80 mL). The combined organic layers were washed with water, dried over sodium sulphate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 100% ethyl acetate in cyclohexane) to afford 6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-amine as a brown solid. LCMS (method 1): Rt=0.98 min, m/z=202 (M+H)+.
To a 0° C. cooled solution of 6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-amine (intermediate 1-67 prepared as described above) (2.580 g, 12.83 mmol) in pyridine (25 mL) was added acetyl chloride (1.86 mL, 25.65 mmol) drop wise under nitrogen atmosphere. The reaction mixture was stirred at 0-10° C. for 1 hour. After completion, the reaction mixture was diluted with ethyl acetate and water, separated both the layers and the aqueous layer was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water, dried over sodium sulphate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 40% ethyl acetate in cyclohexane) to afford N-[6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide. LCMS (method 1): Rt=0.99 min, m/z=244 (M+H)+.
To a solution of N-[6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide (intermediate 1-68 prepared as described above) (2.633 g, 10.83 mmol) in acetonitrile (26.3 mL) was added 1-iodopyrrolidine-2,5-dione (2.92 g, 12.99 mmol) portion wise and the reaction mass was stirred at room temperature for 1.5 hours. After completion, the reaction mass was diluted with water and extracted with ethyl acetate (2×). The combined organic layers were washed with sodium thiosulfate solution followed by brine, dried over sodium sulphate, filtered and concentrated in vacuo to afford N-[3-iodo-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide as a solid. This material was used as such in the next step. LCMS (method 1): Rt=1.01 min, m/z=370 (M+H)+.
To a solution of N-[3-iodo-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]acetamide (intermediate 1-69 prepared as described above) (3.775 g, 10.23 mmol) in acetonitrile (35 mL) was added N,N-dimethylpyridin-4-amine (0.127 g, 1.02 mmol) followed by di-tert-butyl dicarbonate (2.76 g, 12.27 mmol) at 0-10° C. The reaction mass was stirred at room temperature for 2 hours. After completion, the reaction mass was concentrated in vacuo, and then the reaction mass was quenched with ice cold water, extracted with ethyl acetate (3×50 mL). The combined organic layers were washed with a saturated sodium bicarbonate solution, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 30% ethyl acetate in cyclohexane) to afford tert-butyl N-acetyl-N-[3-iodo-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate as a yellow solid. LCMS (method 1): Rt=1.21 min, m/z=370 [(M+H)−100]+.
To a solution of tert-butyl N-acetyl-N-[3-iodo-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate intermediate 1-70 prepared as described above (4.41 g, 9.40 mmol) in dry 1,4-dioxane (40 mL) were added N-ethyl-N-isopropyl-propan-2-amine (4.18 mL, 24.44 mmol) and (5-diphenylphosphanyl-9,9-dimethyl-xanthen-4-yl)-diphenyl-phosphane (0.435 g, 0.75 mmol), then the mixture was degassed with nitrogen for 5 minutes. Tris(dibenzylideneacetone)dipalladium(0) (0.60 g, 0.66 mmol) was added and the solution was degassed with nitrogen for 5 minutes. Sodium ethanethiolate (1.63 g, 18.80 mmol) was added and the solution was further degassed with nitrogen for 5 minutes. Then, the reaction was stirred at 110° C. for 5 hours under a nitrogen atmosphere. The reaction was diluted with ethyl acetate, filtered over a celite pad, and washed with ethyl acetate. The filtrate was washed with brine. Then, the aqueous layer was washed with ethyl acetate, and the combined organic layers were dried over sodium sulfate filtered and concentrated in vacuo. The crude material was purified by combiflash (silica gel, 0-20% ethyl acetate in cyclohexane) to afford tert-butyl N-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate.
To a solution of tert-butyl N-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate (intermediate 1-39 prepared as described above) (3.21 g, 8.88 mmol) in acetonitrile (30 mL) was added 3-chlorobenzenecarboperoxoic acid (70 mass %, 4.82 g, 19.5 mmol) at 0° C. The reaction mass was stirred at 0° C. for 1.5 hours. Then, the solvent was distilled off below 25° C. and the residue was quenched with an aqueous 2N sodium hydroxide solution and water (60 mL). Ethyl acetate (40 mL) was added and the organic layer was separated. The aqueous layer was extracted twice with ethyl acetate (2×50 mL). The combined organic layers were washed with brine (60 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified by combiflash (silica gel, 0-30% ethyl acetate in cyclohexane) to afford pure tert-butyl N-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate as an off white solid. LCMS (method 1): Rt=1.14 min, m/z=392 (M−H)−. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.19 (t, J=7.34 Hz, 3H) 1.48 (s, 9H) 3.49 (q, J=7.30 Hz, 2H) 7.86 (d, J=9.29 Hz, 1H) 8.00 (d, J=9.29 Hz, 1H) 9.44-9.49 (m, 1H) 9.51 (s, 1H).
To a solution of tert-butyl N-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]carbamate (intermediate 1-38 prepared as described above) (0.60 g, 1.52 mmol) in acetonitrile (10 mL) was added cesium carbonate (0.647 g, 1.98 mmol), followed by ethyl 2-(bromomethyl)-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-55) (0.77 g, 1.98 mmol). The reaction mass was stirred at 50° C. for 5 hours, then quenched with ice cold water and the product extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to afford 2-[[tert-butoxycarbonyl-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate as a gummy mass. This material was used as such in the next step. LCMS (method 1): Rt=1.27 Min, m/z=625 (M+H)+.
To a 0° C. cooled solution of ethyl 2-[[tert-butoxycarbonyl-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-35 prepared as described above) (1.15 g, 1.84 mmol) in trifluoromethylbenzene (10 mL) was added 2,2,2-trifluoroacetic acid (2.22 mL, 27.62 mmol) dropwise. The reaction mass was stirred at room temperature for 12 hours. The mixture was concentrated in vacuo, diluted with water (50 mL), and neutralized with an aqueous sodium bicarbonate solution. The aqueous layer was extracted with ethyl acetate (2×60 mL), the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified by combiflash (silica gel, 0-40% ethyl acetate in cyclohexane) to afford ethyl 2-[[[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate. LCMS (method 1): Rt=1.30 min, m/z=525 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.18 (t, J=7.32 Hz, 3H) 1.38 (t, J=7.13 Hz, 3H) 3.28-3.33 (m, 2H) 4.41 (q, J=7.13 Hz, 2H) 5.08 (d, J=5.38 Hz, 2H) 7.01 (t, J=5.44 Hz, 1H) 7.74 (s, 2H) 8.55 (d, J=2.00 Hz, 1H) 9.15-9.19 (m, 1H) 9.27 (s, 1H).
To a solution of ethyl 2-[[[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylate (intermediate 1-36 prepared as described above) (0.605 g, 1.15 mmol) in tetrahydrofuran (10 mL) was added lithium hydroxide monohydrate (0.204 g, 4.61 mmol) in water (3.5 mL) at room temperature. The reaction mass was stirred at room temperature overnight, then concentrated in vacuo, the residue acidified with aqueous 1 N hydrochloric acid, and the product extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with water (50 mL), then with brine, dried over sodium sulfate, filtered and concentrated in vacuo to afford the crude product 2-[[[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid. The crude was used as such for next step. LCMS (method 1): Rt=1.18 Min, m/z=497 (M+H)+.
To a 0° C. cooled solution of 2-[[[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]amino]methyl]-5-(trifluoromethyl)pyridine-3-carboxylic acid (intermediate 1-37 prepared as described above) (0.56 g, 1.13 mmol) in pyridine (2.8 mL) was added phosphorus oxychloride (0.212 mL, 2.26 mmol) dropwise under a nitrogen atmosphere. The reaction mixture was stirred at 0 to 10° C. for 25 minutes. The reaction mass was quenched with ice cold water (60 mL) and the product extracted with ethyl acetate (3×25 mL). The combined organic layers were washed with brine (30 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude was purified by combiflash (silica gel, 0 to 30% ethyl acetate in cyclohexane) to afford pure 6-[3-ethylsulfonyl-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-2-yl]-3-(trifluoromethyl)-7H-pyrrolo[3,4-b]pyridin-5-one as a white solid. LCMS (method 1): Rt=1.18 min m/z=479 (M+H)+. 1H NMR (400 MHz, C0013) b ppm 1.45 (t, J=7.44 Hz, 3H) 3.66 (q, J=7.42 Hz, 2H) 5.18 (s, 2H) 7.68 (dd, J=9.44, 1.31 Hz, 1H) 8.25 (d, J=9.38 Hz, 1H) 8.47-8.50 (m, 1H) 8.86 (s, 1H) 9.12-9.15 (in, 1H).
1H NMR, LCMS, GCMS
The activity of the compositions according to the invention can be broadened considerably, and adapted to prevailing circumstances, by adding other insecticidally, acaricidally and/or fungicidally active ingredients. The mixtures of the compounds of formula I with other insecticidally, acaricidally and/or fungicidally active ingredients may also have further surprising advantages which can also be described, in a wider sense, as synergistic activity. For example, better tolerance by plants, reduced phytotoxicity, insects can be controlled in their different development stages or better behaviour during their production, for example during grinding or mixing, during their storage or during their use. Suitable additions to active ingredients here are, for example, representatives of the following classes of active ingredients: organophosphorus compounds, nitrophenol derivatives, thioureas, juvenile hormones, formamidines, benzophenone derivatives, ureas, pyrrole derivatives, carbamates, pyrethroids, chlorinated hydrocarbons, acylureas, pyridylmethyleneamino derivatives, macrolides, neonicotinoids and Bacillus thuringiensis preparations.
The following mixtures of the compounds of formula I with active ingredients are preferred (the abbreviation “TX” means “one compound selected from the group consisting of the compounds described in Tables A-1 to A-12, B-1 to B-12, C-1 to C-15, and D-1 to D-15 and Table P of the present invention”):
The references in brackets behind the active ingredients, e.g. [3878-19-1] refer to the Chemical Abstracts Registry number. The above described mixing partners are known. Where the active ingredients are included in “The Pesticide Manual” [The Pesticide Manual—A World Compendium; Thirteenth Edition; Editor: C. D. S. TomLin; The British Crop Protection Council], they are described therein under the entry number given in round brackets hereinabove for the particular compound; for example, the compound “abamectin” is described under entry number (1). Where “[CCN]” is added hereinabove to the particular compound, the compound in question is included in the “Compendium of Pesticide Common Names”, which is accessible on the internet [A. Wood; Compendium of Pesticide Common Names, Copyright © 1995-2004]; for example, the compound “acetoprole” is described under the internet address http://www.alanwood.net/pesticides/acetoprole.htm.
Most of the active ingredients described above are referred to hereinabove by a so-called “common name”, the relevant “ISO common name” or another “common name” being used in individual cases. If the designation is not a “common name”, the nature of the designation used instead is given in round brackets for the particular compound; in that case, the IUPAC name, the IUPAC/Chemical Abstracts name, a “chemical name”, a “traditional name”, a “compound name” or a “development code” is used or, if neither one of those designations nor a “common name” is used, an “alternative name” is employed. “CAS Reg. No” means the Chemical Abstracts Registry Number.
The active ingredient mixture of the compounds of formula I selected from Tables A-1 to A-12, B-1 to B-12, C-1 to C-15, and D-1 to D-15 and Table P with active ingredients described above comprises a compound selected from Tables A-1 to A-42 and Table P and an active ingredient as described above preferably in a mixing ratio of from 100:1 to 1:6000, especially from 50:1 to 1:50, more especially in a ratio of from 20:1 to 1:20, even more especially from 10:1 to 1:10, very especially from 5:1 and 1:5, special preference being given to a ratio of from 2:1 to 1:2, and a ratio of from 4:1 to 2:1 being likewise preferred, above all in a ratio of 1:1, or 5:1, or 5:2, or 5:3, or 5:4, or 4:1, or 4:2, or 4:3, or 3:1, or 3:2, or 2:1, or 1:5, or 2:5, or 3:5, or 4:5, or 1:4, or 2:4, or 3:4, or 1:3, or 2:3, or 1:2, or 1:600, or 1:300, or 1:150, or 1:35, or 2:35, or 4:35, or 1:75, or 2:75, or 4:75, or 1:6000, or 1:3000, or 1:1500, or 1:350, or 2:350, or 4:350, or 1:750, or 2:750, or 4:750. Those mixing ratios are by weight.
The mixtures as described above can be used in a method for controlling pests, which comprises applying a composition comprising a mixture as described above to the pests or their environment, with the exception of a method for treatment of the human or animal body by surgery or therapy and diagnostic methods practised on the human or animal body.
The mixtures comprising a compound of formula I selected from Tables A-1 to A-12, B-1 to B-12, C-1 to C-15, and D-1 to D-15 and Table P and one or more active ingredients as described above can be applied, for example, in a single “ready-mix” form, in a combined spray mixture composed from separate formulations of the single active ingredient components, such as a “tank-mix”, and in a combined use of the single active ingredients when applied in a sequential manner, i.e. one after the other with a reasonably short period, such as a few hours or days. The order of applying the compounds of formula I selected from Tables A-1 to A-12, B-1 to B-12, C-1 to C-15, and D-1 to D-15 and Table P and the active ingredients as described above is not essential for working the present invention.
The compositions according to the invention can also comprise further solid or liquid auxiliaries, such as stabilizers, for example unepoxidized or epoxidized vegetable oils (for example epoxidized coconut oil, rapeseed oil or soya oil), antifoams, for example silicone oil, preservatives, viscosity regulators, binders and/or tackifiers, fertilizers or other active ingredients for achieving specific effects, for example bactericides, fungicides, nematocides, plant activators, molluscicides or herbicides.
The compositions according to the invention are prepared in a manner known per se, in the absence of auxiliaries for example by grinding, screening and/or compressing a solid active ingredient and in the presence of at least one auxiliary for example by intimately mixing and/or grinding the active ingredient with the auxiliary (auxiliaries). These processes for the preparation of the compositions and the use of the compounds I for the preparation of these compositions are also a subject of the invention.
The application methods for the compositions, that is the methods of controlling pests of the abovementioned type, such as spraying, atomizing, dusting, brushing on, dressing, scattering or pouring—which are to be selected to suit the intended aims of the prevailing circumstances—and the use of the compositions for controlling pests of the abovementioned type are other subjects of the invention. Typical rates of concentration are between 0.1 and 1000 ppm, preferably between 0.1 and 500 ppm, of active ingredient. The rate of application per hectare is generally 1 to 2000 g of active ingredient per hectare, in particular 10 to 1000 g/ha, preferably 10 to 600 g/ha.
A preferred method of application in the field of crop protection is application to the foliage of the plants (foliar application), it being possible to select frequency and rate of application to match the danger of infestation with the pest in question. Alternatively, the active ingredient can reach the plants via the root system (systemic action), by drenching the locus of the plants with a liquid composition or by incorporating the active ingredient in solid form into the locus of the plants, for example into the soil, for example in the form of granules (soil application). In the case of paddy rice crops, such granules can be metered into the flooded paddy-field.
The compounds of the invention and compositions thereof are also be suitable for the protection of plant propagation material, for example seeds, such as fruit, tubers or kernels, or nursery plants, against pests of the abovementioned type. The propagation material can be treated with the compound prior to planting, for example seed can be treated prior to sowing. Alternatively, the compound can be applied to seed kernels (coating), either by soaking the kernels in a liquid composition or by applying a layer of a solid composition. It is also possible to apply the compositions when the propagation material is planted to the site of application, for example into the seed furrow during drilling. These treatment methods for plant propagation material and the plant propagation material thus treated are further subjects of the invention. Typical treatment rates would depend on the plant and pest/fungi to be controlled and are generally between 1 to 200 grams per 100 kg of seeds, preferably between 5 to 150 grams per 100 kg of seeds, such as between 10 to 100 grams per 100 kg of seeds.
The term seed embraces seeds and plant propagules of all kinds including but not limited to true seeds, seed pieces, suckers, corns, bulbs, fruit, tubers, grains, rhizomes, cuttings, cut shoots and the like and means in a preferred embodiment true seeds.
The present invention also comprises seeds coated or treated with or containing a compound of formula I. The term “coated or treated with and/or containing” generally signifies that the active ingredient is for the most part on the surface of the seed at the time of application, although a greater or lesser part of the ingredient may penetrate into the seed material, depending on the method of application. When the said seed product is (re)planted, it may absorb the active ingredient. In an embodiment, the present invention makes available a plant propagation material adhered thereto with a compound of formula (I). Further, it is hereby made available, a composition comprising a plant propagation material treated with a compound of formula (I).
Seed treatment comprises all suitable seed treatment techniques known in the art, such as seed dressing, seed coating, seed dusting, seed soaking and seed pelleting. The seed treatment application of the compound formula (I) can be carried out by any known methods, such as spraying or by dusting the seeds before sowing or during the sowing/planting of the seeds.
The Examples which follow serve to illustrate the invention. Certain compounds of the invention can be distinguished from known compounds by virtue of greater efficacy at low application rates, which can be verified by the person skilled in the art using the experimental procedures outlined in the Examples, using lower application rates if necessary, for example 50 ppm, 24 ppm, 12.5 ppm, 6 ppm, 3 ppm, 1.5 ppm, 0.8 ppm or 0.2 ppm.
Maize sprouts placed onto an agar layer in 24-well microtiter plates were treated with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions by spraying. After drying, the plates were infested with L2 larvae (6 to 10 per well). The samples were assessed for mortality and growth inhibition in comparison to untreated samples 4 days after infestation.
The following compounds gave an effect of at least 80% in at least one of the two categories (mortality or growth inhibition) at an application rate of 200 ppm: P1, P2, P3, P4, P5, P6, P7.
Sunflower leaf discs were placed onto agar in a 24-well microtiter plate and sprayed with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions. After drying, the leaf discs were infested with an aphid population of mixed ages. The samples were assessed for mortality 6 days after infestation.
The following compounds resulted in at least 80% mortality at an application rate of 200 ppm: P1, P2, P3, P4, P6, P7.
Cotton leaf discs were placed onto agar in 24-well microtiter plates and sprayed with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions. After drying the leaf discs were infested with five L1 larvae. The samples were assessed for mortality, anti-feeding effect, and growth inhibition in comparison to untreated samples 3 days after infestation. Control of Spodoptera littoralis by a test sample is given when at least one of the categories mortality, anti-feedant effect, and growth inhibition is higher than the untreated sample.
The following compounds resulted in at least 80% control at an application rate of 200 ppm: P1, P2, P3, P4, P5, P6, P7.
Cotton leaf discs were placed on agar in 24-well microtiter plates and sprayed with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions. After drying the leaf discs were infested with adult white flies. The samples were checked for mortality 6 days after incubation.
The following compounds resulted in at least 80% mortality at an application rate of 200 ppm: P2.
24-well microtiter plates with artificial diet were treated with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions by pipetting. After drying, the plates were infested with L2 larvae (6-8 per well). The samples were assessed for mortality, anti-feeding effect, and growth inhibition in comparison to untreated samples 6 days after infestation. Control of Chilo suppressalis by a test sample is given when at least one of the categories mortality, anti-feedant effect, and growth inhibition is higher than the untreated sample.
The following compounds resulted in at least 80% control at an application rate of 200 ppm: P1, P2, P3, P4, P5, P6, P7.
Soybean leaves on agar in 24-well microtiter plates were sprayed with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions. After drying the leaves were infested with N2 nymphs. The samples were assessed for mortality and growth inhibition in comparison to untreated samples 5 days after infestation.
The following compounds gave an effect of at least 80% in at least one of the two categories (mortality or growth inhibition) at an application rate of 200 ppm: P1, P4, P5, P7.
Sunflower leaf discs were placed on agar in 24-well microtiter plates and sprayed with aqueous test solutions prepared from 10′000 DMSO stock solutions. After drying the leaf discs were infested with a Frankliniella population of mixed ages. The samples were assessed for mortality 7 days after infestation.
The following compounds resulted in at least 80% mortality at an application rate of 200 ppm: P3, P4, P7.
24-well microtiter plates with artificial diet were treated with aqueous test solutions prepared from 10′000 ppm DMSO stock solutions by pipetting. After drying, Plutella eggs were pipetted through a plastic stencil onto a gel blotting paper and the plate was closed with it. The samples were assessed for mortality and growth inhibition in comparison to untreated samples 8 days after infestation.
The following compounds gave an effect of at least 80% in at least one of the two categories (mortality or growth inhibition) at an application rate of 200 ppm: P1, P2, P3, P4, P5, P6, P7.
Rice plants cultivated in a nutritive solution were treated with the diluted test solutions into nourishing cultivation system. 1 day after application plants were infested with ˜20 N3 nymphs. 7 days after infestation samples were assessed for mortality and growth regulation.
The following compounds resulted in at least 80% mortality at an application rate of 12.5 ppm: P1, P4, P5, P6.
Diet cubes coated with paraffin were sprayed with diluted test solutions in an application chamber. After drying off the treated cubes (10 replicates) were infested with 1 L1 larvae. Samples were incubated at 26-27° C. and checked 14 days after infestation for mortality and growth inhibition.
The following compounds resulted in at least 80% mortality at an application rate of 12.5 ppm: P1, P2, P3, P4, P5, P6.
Roots of pea seedlings infested with an aphid population of mixed ages were placed directly into aqueous test solutions prepared from 10′000 DMSO stock solutions. The samples were assessed for mortality 6 days after placing seedlings into test solutions.
The following compounds resulted in at least 80% mortality at a test rate of 24 ppm: P7
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011037693 | Sep 2020 | IN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2021/074159 | 9/1/2021 | WO |
