Process for the preparation of 1-H-pyrrolidine-2,4-dione derivatives

Abstract

The present invention relates to a novel process for the preparation of 1-H-pyrrolidine-2,4-dione derivatives and to novel intermediates and to a process for their preparation.

Description

The present invention relates to a novel, process for the preparation of 1-H-pyrrolidine-2,4-dione derivatives and to novel intermediates and to a process for their preparation.

1-H-Pyrrolidine-2,4-dione derivatives with acaricidal, insecticidal, fungicidal and herbicidal effect are known:

• EP-A-456 063, EP-A-521 334, EP-A-596 298, EP-A-613 884, EP-A-613 885, WO 95/01 971, WO 95/26 954, WO 95/20 572, EP-A-0 668 267, WO 96/25 395, WO 96/35 664, WO 97/01 535, WO 97/02 243, WO 97/36 868, WO 97/43275, WO 98/05638, WO 98/06721, WO 98/25928, WO 99/24437, WO 99/43649, WO 99/48869, WO 99/55673, WO 01/17972, WO 01/23354, WO 01/74770, WO 03/013249, WO 03/062244, WO 2004/007448, WO 2004/024 688, WO 04/065366, WO 04/080962, WO 04/111042, WO 05/044791, WO 05/044796, WO 05/048710, WO 05/049569, WO 05/066125, WO 05/092897, WO 06/000355, WO 06/029799, WO 06/056281, WO 06/056282, WO 06/089633, WO 07/048545, DEA 102 00505 9892, WO 07/073856, WO 07/096058, WO 07/121868, WO 07/140881, WO 08/067873, WO 08/067910, WO 08/067911, WO 08/138551, WO 09/015801, WO 09/039975, WO 09/049851, WO 09/115262, WO 10/052161, WO 10/102758, WO 10/063378, WO 10/063670, WO 10/102758, WO 2011/098443, WO 2011/098440, WO 11/067135, WO 11/067240, EP Application number 11154805.3. Moreover, ketal-substituted 1-H-arylpyrrolidine-2,4-diones are known from WO 99/16748. With pharmaceutical effect are known WO 2011/098433, DE-A-102010008642, DE-A-102010008643 and DE Application number 102010008640.

Biphenyl-substituted 1H-pyrrolidinedione derivatives with fungicidal effect are also known (WO 03/059065).

These are compounds of the formula (I)

in which

• W is hydrogen, halogen, alkyl, alkenyl, alkynyl, optionally substituted cycloalkyl, alkoxy, haloalkyl or haloalkoxy,
• X is hydrogen, halogen, alkyl, alkenyl, alkynyl, optionally substituted cycloalkyl, alkoxy, haloalkyl, haloalkoxy or cyano,
• Y and Z independently of one another are hydrogen, alkyl, alkenyl, alkynyl, halogen, cyano, optionally substituted cycloalkyl, alkoxy, haloalkyl, haloalkoxy or in each case optionally substituted aryl or hetaryl,
• A is hydrogen, is in each case optionally halogen-substituted alkyl, alkenyl, alkoxyalkyl, alkylthioalkyl, saturated or unsaturated, optionally substituted cycloalkyl, in which optionally at least one ring atom is replaced by a heteroatom, or aryl, arylalkyl or hetaryl each of which is optionally substituted by halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, cyano or nitro,
• B is hydrogen, alkyl or alkoxyalkyl, or
• A and B together with the carbon atom to which they are bonded are a saturated or unsaturated, unsubstituted or substituted cycle optionally containing at least one heteroatom,
• G is hydrogen (a) or is one of the groups

in which

• E is a metal ion or an ammonium ion,
• L is oxygen or sulphur,
• M is oxygen or sulphur,
• R¹ is alkyl, alkenyl, alkoxyalkyl, alkylthioalkyl or polyalkoxyalkyl each of which is optionally substituted by halogen or cyano, or is cycloalkyl or heterocyclyl each of which is optionally substituted by halogen, alkyl or alkoxy, or is in each case optionally substituted phenyl, phenylalkyl, hetaryl, phenoxyalkyl or hetaryloxyalkyl,
• R² is alkyl, alkenyl, alkoxyalkyl or polyalkoxyalkyl each of which is optionally substituted by halogen or cyano, or is in each case optionally substituted cycloalkyl, phenyl or benzyl,
• R³, R⁴ and R⁵ independently of one another are in each case alkyl, alkoxy, alkylamino, dialkylamino, alkylthio, alkenylthio or cycloalkylthio optionally substituted by halogen, or are in each case optionally substituted phenyl, benzyl, phenoxy or phenylthio,
• R⁶ and R⁷ independently of one another are hydrogen, are in each case alkyl, cycloalkyl, alkenyl, alkoxy, alkoxyalkyl optionally substituted by halogen or cyano, are in each case optionally substituted phenyl or benzyl, or together with the N atom to which they are bonded form a cycle which optionally contains oxygen or sulphur and is optionally substituted.

Depending inter alia on the nature of the substituents, the compounds of the formula (I) can be present as optical isomers or isomer mixtures of varying composition which, if desired, can be separated in the usual way. Both the pure isomers and the isomer mixtures, their preparation and use, and also compositions comprising these are provided by the present invention. For the sake of simplicity, however, reference is always made hereinbelow to compounds of the formula (I), although both the pure compounds and, if appropriate, also mixtures having different fractions of isomeric compounds are meant.

Taking into consideration the various meanings (a), (b), (c), (d), (e), (f) and (g) of the group G, the following main structures (I-a) to (I-g) arise,

in which

• A, B, E, L, M, W, X, Y, Z, R¹, R², R³, R⁴, R⁵, R⁶ and R⁷ have the meanings given above.

Furthermore, it is already known that the compounds of the formula (I) are obtained by the processes described below:

(A*) Compounds of the formula (I-a)

in which

• A, B, W, X, Y and Z have the meanings given above,are obtained whencompounds of the formula (II)

in which

• A, B, W, X, Y and Z have the meanings given above,and
• R⁸ is alkyl,are intramolecularly condensed in the presence of a diluent and in the presence of a base.

Moreover, it is known

• (B*) that the compounds of the formulae (1-b) shown above in which R¹, A, B, W, X, Y and Z have the meanings given above are obtained when compounds of the formulae (I-a) shown above in which A, B, W, X, Y and Z have the meanings given above, are in each case reacted
• α) with compounds of the formula (III)

in which

• R¹ has the meaning given above and
• Hal is halogen (in particular chlorine or bromine)or
• β) with carboxylic anhydrides of the formula (IV)R¹—CO—O—CO—R¹  (IV)in which
• R¹ has the meaning given above,optionally in the presence of a diluent and optionally in the presence of an acid binder;
• (C*) that the compounds of the formulae (I-c) shown above in which R², A, B, M, W, X, Y and Z have the meanings given above and L is oxygen are obtained when compounds of the formulae (I-a) shown above in which A, B, W, X, Y and Z have the meanings given above, are in each case reactedwith chloroformic acid esters or chloroformic acid thioesters of the formula (V)R²-M-CO—Cl  (V)in which
• R² and M have the meanings given above,optionally in the presence of a diluent and optionally in the presence of an acid binder;
• (D*) that compounds of the formulae (I-f) shown above in which E, A, B, W, X, Y and Z have the meanings given above are obtained when compounds of the formulae (I-a) in which A, B, W, X, Y and Z have the meanings given above, are in each case reactedwith metal compounds or amines of the formulae (XIII) or (XIV)

in which

• Me is a mono- or divalent metal (preferably an alkali metal or alkaline earth metal such as lithium, sodium, potassium, magnesium or calcium),
• t is the number 1 or 2 and
• R¹⁰, R¹¹, R¹², independently of one another, are hydrogen or alkyl (preferably C₁-C₈-alkyl),optionally in the presence of a diluent.

The compounds are generally defined by the formula (I). Preferred substituents and/or ranges of the radicals listed in the formulae mentioned above and below are explained hereinbelow:

• W is preferably hydrogen, chlorine, bromine, C₁-C₄-alkyl, C₂-C₄-alkenyl, C₂-C₄-alkynyl, C₃-C₆-cycloalkyl optionally monosubstituted by methyl, ethyl, methoxy, fluorine, chlorine, trifluoromethyl or cyclopropyl, C₁-C₄-alkoxy, C₁-C₂-haloalkyl or C₁-C₂-haloalkoxy,
• X is preferably hydrogen, chlorine, bromine, iodine, C₁-C₄-alkyl, C₂-C₄-alkenyl, C₂-C₄-alkynyl, C₃-C₆-cycloalkyl optionally monosubstituted by methyl, ethyl, methoxy, fluorine, chlorine, trifluoromethyl or cyclopropyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or cyano,
• Y and Z are preferably, independently of one another, hydrogen, cyano, fluorine, chlorine, bromine, iodine, C₁-C₄-alkyl, C₂-C₄-alkenyl, C₂-C₄-alkynyl, C₃-C₆-cycloalkyl optionally monosubstituted by methyl, ethyl, methoxy, fluorine, chlorine, trifluoromethyl or cyclopropyl, C₁-C₆-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy, or is one of the (Het)-aryl radicals,

• • where in the case of (Het)-aryl only one of the radicals Y or Z may be (Het)-aryl,
• V¹ is preferably hydrogen, fluorine, chlorine, bromine, C₁-C₆-alkyl, C₁-C₄-alkoxy, C₁-C₂-haloalkyl, C₁-C₂-haloalkoxy, nitro, cyano or phenyl optionally mono- to disubstituted by fluorine, chlorine, bromine, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₂-haloalkyl, C₁-C₂-haloalkoxy, nitro or cyano,
• V² and V³ are preferably, independently of one another, hydrogen, fluorine, chlorine, bromine, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₂-haloalkyl or C₁-C₂-haloalkoxy,
• A is preferably hydrogen, C₁-C₆-alkyl, C₁-C₄-alkoxy-C₁-C₂-alkyl, each of which is optionally mono- to trisubstituted by fluorine or chlorine, C₃-C₆-cycloalkyl which is optionally mono- to disubstituted by C₁-C₂-alkyl or C₁-C₂-alkoxy and which is optionally interrupted by an oxygen atom, or phenyl, pyridyl or benzyl each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine, C₁-C₄-alkyl, C₁-C₂-haloalkyl, C₁C₄-alkoxy, C₁-C₂-haloalkoxy, cyano or nitro,
• B is preferably hydrogen, C₁-C₄-alkyl or C₁-C₂-alkoxy-C₁-C₂-alkyl or
• A, B and the carbon atom to which they are bonded are preferably saturated or unsaturated C₃-C₇-cycloalkyl in which optionally one ring member is replaced by nitrogen, oxygen or sulphur and which is optionally mono- to disubstituted by halogen, C₁-C₆-alkyl, C₁-C₄-alkoxy-C₁-C₂-alkyl, trifluoromethyl, C₁-C₆-alkoxy, C₃-C₆-alkenyloxy, trifluoroethoxy, C₁-C₃-alkoxy-C₁-C₃-alkoxy or C₃-C₆-cycloalkylmethoxy, where the aforementioned radicals (with the exception of halogen and trifluoromethyl) are also suitable as N substituents, or
• A, B and the carbon atom to which they are bonded are preferably C₅-C₆-cycloalkyl which is substituted by an alkylenediyl group or by an alkylenedioxyl group or by an alkylenedithiol group which optionally contains with one or two non-directly adjacent oxygen or sulphur atoms and which is optionally substituted by methyl or ethyl, and which, with the carbon atom to which it is bonded, forms a further five- or six-membered ring, or
• A, B and the carbon atom to which they are bonded are preferably C₃-C₆-cycloalkyl or C₅-C₆-cycloalkenyl in which two substituents, together with the carbon atoms to which they are bonded, are C₂-C₄-alkanediyl, C₂-C₄-alkenediyl or butadienediyl each of which is optionally substituted by C₁-C₂-alkyl or C₁-C₂-alkoxy,
• G is preferably hydrogen (a) or is one of the groups

in which

• E is a metal ion or an ammonium ion,
• L is oxygen or sulphur and
• M is oxygen or sulphur,
• R¹ is preferably C₁-C₁₆-alkyl, C₂-C₁₆-alkenyl, C₁-C₆-alkoxy-C₁-C₄-alkyl, C₁-C₆-alkylthio-C₁-C₄-alkyl or poly-C₁-C₆-alkoxy-C₁-C₄-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine, or is C₃-C₇-cycloalkyl optionally mono- to disubstituted by fluorine, chlorine, C₁-C₅-alkyl or C₁-C₅-alkoxy, in which optionally one or two non-directly adjacent methylene groups are replaced by oxygen and/or sulphur,
  • is phenyl optionally mono- to trisubstituted by fluorine, chlorine, bromine, cyano, nitro, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₃-haloalkyl, C₁-C₃-haloalkoxy, C₁-C₄-alkylthio or C₁-C₄-alkylsulphonyl,
  • is phenyl C₁-C₄-alkyl optionally mono- to disubstituted by fluorine, chlorine, bromine, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₃-haloalkyl or C₁-C₃-haloalkoxy,
  • is pyrazolyl, thiazolyl, pyridyl, pyrimidyl, furanyl or thienyl each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine or C₁-C₄-alkyl,
  • is phenoxy-C₁-C₅-alkyl optionally mono- to disubstituted by fluorine, chlorine, bromine or C₁-C₄-alkyl, or
  • is pyridyloxy-C₁-C₅-alkyl, pyrimidyloxy-C₁-C₅-alkyl or thiazolyloxy-C₁-C₅-alkyl each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine, amino or C₁-C₄-alkyl,
• R² is preferably C₁-C₁₆-alkyl, C₂-C₆-alkenyl, C₁-C₆-alkoxy-C₂-C₆-alkyl or poly-C₁-C₆-alkoxy-C₂-C₆-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine,
  • is C₃-C₇-cycloalkyl optionally mono- to disubstituted by fluorine, chlorine, C₁-C₄-alkyl or C₁-C₄-alkoxy or
  • is phenyl or benzyl each of which is optionally mono- to trisubstituted by fluorine, chlorine, bromine, cyano, nitro, C₁-C₄-alkyl, C₁-C₃-alkoxy, C₁-C₃-haloalkyl or C₁-C₃-haloalkoxy,
• R³ is preferably C₁-C₆-alkyl optionally mono- to trisubstituted by fluorine or chlorine, or phenyl or benzyl each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₂-haloalkoxy, C₁-C₂-haloalkyl, cyano or nitro,
• R⁴ and R⁵, independently of one another, are preferably C₁-C₆-alkyl, C₁-C₆-alkoxy, C₁-C₆-alkylamino, di(C₁-C₆-alkyl)amino, C₁-C₆-alkylthio or C₃-C₄-alkenylthio each of which is optionally mono- to trisubstituted by fluorine or chlorine, or are phenyl, phenoxy or phenylthio each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine, nitro, cyano, C₁-C₃-alkoxy, C₁-C₃-haloalkoxy, C₁-C₃-alkylthio, C₁-C₃-halo-alkylthio, C₁-C₃-alkyl, or C₁-C₃-haloalkyl,
• R⁶ and R⁷, independently of one another, are preferably hydrogen, C₁-C₆-alkyl, C₃-C₆-cycloalkyl, C₁-C₆-alkoxy, C₃-C₆-alkenyl or C₁-C₆-alkoxy-C₂-C₆-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine, are phenyl or benzyl each of which is optionally mono- to trisubstituted by fluorine, chlorine, bromine, C₁-C₅-haloalkyl, C₁-C₅-alkyl or C₁-C₅-alkoxy, or together are a C₃-C₆-alkylene radical optionally substituted by C₁-C₄-alkyl in which optionally one methylene group is replaced by oxygen or sulphur.

In the radical definitions specified as preferred, halogen is fluorine, chlorine and bromine, in particular fluorine and chlorine.

• W is particularly preferably hydrogen, chlorine, bromine, methyl, ethyl, methoxy, ethoxy or trifluoromethyl,
• X is particularly preferably hydrogen, chlorine, bromine, iodine, methyl, ethyl, propyl, cyclopropyl, methoxy, ethoxy, trifluoromethyl or trifluoromethoxy,
• Y and Z are particularly preferably, independently of one another, hydrogen, fluorine, chlorine, bromine, iodine, methyl, ethyl, cyclopropyl, methoxy, trifluoromethyl, trifluoromethoxy or a phenyl radical,

• • where in the case of phenyl, only one of the radicals Y or Z may be phenyl,
• V¹ is particularly preferably hydrogen, fluorine or chlorine,
• V² is particularly preferably hydrogen, fluorine, chlorine, methyl, ethyl, n-propyl, isopropyl, methoxy, ethoxy or trifluoromethyl,
• A is particularly preferably hydrogen, C₁-C₄-alkyl or C₁-C₂-alkoxy-C₁-C₂-alkyl each of which is optionally mono- to trisubstituted by fluorine, is cyclopropyl, cyclopentyl or cyclohexyl,
• B is particularly preferably hydrogen, methyl or ethyl or
• A, B and the carbon atom to which they are bonded are particularly preferably saturated C₅-C₆-cycloalkyl in which optionally one ring member is replaced by nitrogen, oxygen or sulphur and which is optionally mono- or disubstituted by fluorine, chlorine, methyl, ethyl, methoxymethyl, ethoxymethyl, methoxyethyl, ethoxyethyl, trifluoromethyl, methoxy, ethoxy, propoxy, butoxy, methoxyethoxy, ethoxyethoxy, allyloxy, trifluoroethoxy or cyclopropylmethoxy, where the aforementioned radicals (with the exception of fluorine, chlorine and trifluoromethyl) are also suitable as N substituents,
• A, B and the carbon atom to which they are bonded are particularly preferably C₆-cycloalkyl which is optionally substituted by an alkylidenediyl group optionally interrupted by a with a oxygen atom, or by an alkylidenediyl group containing with two non-directly adjacent oxygen atoms, where a 5- or 6-ring ketal is formed and which may in each case be optionally mono- or disubstituted by methyl, or
• A, B and the carbon atom to which they are bonded are particularly preferably C₅-C₆-cycloalkyl or C₅-C₆-cycloalkenyl, in which two substituents, together with the carbon atoms to which they are bonded, are C₂-C₄-alkanediyl or C₂-C₄-alkenediyl or butadienediyl,
• G is particularly preferably hydrogen (a) or one of the groups

in which

• E is a metal ion or an ammonium ion,
• L is oxygen or sulphur and
• M is oxygen or sulphur,
• R¹ is particularly preferably C₁-C₁₀-alkyl, C₂-C₁₀-alkenyl, C₁-C₄-alkoxy-C₁-C₂-alkyl, C₁-C₄-alkylthio-C₁-C₂-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine, or is C₃-C₆-cycloalkyl optionally monosubstituted by fluorine, chlorine, methyl, ethyl or methoxy,
  • is phenyl optionally mono- to disubstituted by fluorine, chlorine, bromine, cyano, nitro, methyl, ethyl, n-propyl, isopropyl, methoxy, ethoxy, trifluoromethyl or trifluoromethoxy,
  • is furanyl, thienyl or pyridyl each of which is optionally monosubstituted by chlorine, bromine or methyl,
• R² is particularly preferably C₁-C₁₀-alkyl, C₂-C₁₀-alkenyl or C₁-C₄-alkoxy-C₂-C₄-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine,
  • is cyclopentyl or cyclohexyl
  • or is phenyl or benzyl each of which is optionally mono- to disubstituted by fluorine, chlorine, cyano, nitro, methyl, ethyl, methoxy, trifluoromethyl or trifluoromethoxy,
• R³ is particularly preferably methyl, ethyl, propyl or isopropyl each of which is optionally mono- to trisubstituted by fluorine or chlorine, or phenyl in each case optionally monosubtituted by fluorine, chlorine, bromine, methyl, ethyl, isopropyl, tert-butyl, methoxy, ethoxy, isopropoxy, trifluoromethyl, trifluoromethoxy, cyano or nitro,
• R⁴ and R⁵, independently of one another, are particularly preferably C₁-C₄-alkoxy or C₁-C₄-alkylthio or are phenyl, phenoxy or phenylthio each of which is optionally monosubstituted by fluorine, chlorine, bromine, nitro, cyano, methyl, methoxy, trifluoromethyl or trifluoromethoxy,
• R⁶ and R⁷, independently of one another, are particularly preferably hydrogen, C₁-C₄-alkyl, C₃-C₆-cycloalkyl, C₁-C₄-alkoxy, C₃-C₄-alkenyl or C₁-C₄-alkoxy-C₂-C₄-alkyl, phenyl optionally mono- to disubstituted by fluorine, chlorine, bromine, methyl, methoxy or trifluoromethyl, or together are a C₅-C₆-alkylene radical in which optionally one methylene group is replaced by oxygen or sulphur.
• W is very particularly preferably hydrogen, chlorine, methyl, ethyl or methoxy, (emphasis on hydrogen, chlorine or methyl),
• X is very particularly preferably hydrogen, chlorine, methyl, ethyl, methoxy or ethoxy (emphasis on hydrogen, chlorine or methyl),
• Y and Z are very particularly preferably, independently of one another, hydrogen, chlorine, methyl or the radical

• • where in this case only one of the radicals Y or Z may be

• • (most notably, Z

• •  and Y is hydrogen)
• V¹ is very particularly preferably hydrogen, fluorine or chlorine, (emphasis on hydrogen or chlorine),
• V² is very particularly preferably hydrogen, fluorine or chlorine (emphasis on hydrogen),
• A is very particularly preferably methyl, ethyl, propyl, isopropyl or cyclopropyl, (emphasis on methyl),
• B is very particularly preferably hydrogen or methyl, (emphasis on methyl),
• A, B and the carbon atom to which they are bonded are very particularly preferably saturated C₅-C₆-cycloalkyl in which optionally one ring member is replaced by oxygen and which is optionally monosubstituted by fluorine, chlorine, methyl, ethyl, methoxymethyl, methoxy, ethoxy, propoxy, butoxy, trifluoroethoxy, (emphasis on C₆-cycloalkyl which is substituted by methoxy), or
• A, B and the carbon atom to which they are bonded are very particularly preferably C₆-cycloalkyl which is optionally substituted by an alkylidenediyl group optionally interrupted by a with oxygen, or by an alkylidenediyl group containing with two non-directly adjacent oxygen atoms, where a 5- or 6-ring ketal is formed, each of which may be mono- or disubstituted by methyl,
• G is very particularly preferably hydrogen (a) or one of the groups

in which

• E is a lithium, sodium, potassium, rubidium, caesium, magnesium, calcium ion or an ammonium ion,
• R¹ is very particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, cyclopropyl, cyclopentyl or cyclohexyl,
• R² is very particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, or is benzyl.

The radical definitions and explanations listed above in general terms or in preferred ranges can be combined as desired with one another, i.e. including between the respective ranges and preferred ranges. They apply accordingly for the end products and also for the pre-products and intermediates.

According to the invention, preference is given to the compounds of the formula (I) in which a combination of the meanings listed above as preferred (preferably) is present.

According to the invention, particular preference is given to the compounds of the formula (I) in which a combination of the meanings listed above as particularly preferred is present.

According to the invention, very particular preference is given to the compounds of the formula (I) in which a combination of the meanings listed above as very particularly preferred is present.

The compounds of the formula (II) required in the process (A*) as starting materials

in which

• A, B, W, X, Y, Z and R⁸ have the meanings given above,are obtained, for example, when amino acid derivatives of the formula (VI)

in which

• A, B and R⁸ have the meaning given above,are acylated with substituted phenylacetic acid derivatives of the formula (VII)

in which

• W, X, Y and Z have the meanings given above and
• U is a leaving group introduced via carboxylic acid activating reagents such as carbonyldiimidazole, carbonyldiimides (such as e.g. dicyclohexylcarbodiimide), phosphorylating reagents (such as e.g. POCl₃, BOP—Cl), halogenating agents such as e.g. thionyl chloride, oxalyl chloride or phosgene, and also via benzenesulphonyl chloride or chloroformic acid esters,

(Chem. Reviews 52, 237-416 (1953); Bhattacharya, Indian J. Chem. 6, 341-5, 1968)

or when acylamino acids of the formula (VIII)

in which

• A, B, W, X, Y and Z have the meanings given above,are esterified (Chem. Ind. (London) 1568 (1968)).

The compounds of the formula (VIII) are obtained for example when amino carboxylic acids of the formula (IX)

in which

• A and B have the meanings given aboveare acylated with substituted phenylacetic acid derivatives of the formula (VII)

in which

• U, W, X, Y and Z have the meanings given above

e.g. according to Schotten-Baumann (Organikum [Organic Chemistry], VEB Deutscher Verlag der Wissenschaften, Berlin 1977, p. 505).

The compounds of the formulae (VI) and (IX) are known and can be synthesized by known processes (see e.g. Compagnon, Ann. Chim. (Paris) [14]5, p. 11-22, 23-27 (1970), L. Munday, J. Chem. Soc. 4372 (1961); J. T. Eward, C. Jitrangeri, Can. J. Chem. 5, 3339 (1975), WO 02/02532), and also as described in the laid-open specifications cited at the start.

For these known processes, in each case substituted phenylacetic acid derivatives of the formula (VII)

in which U, W, X, Y and Z have the meanings given above,are thus required.

The compounds of the formula (VII) are known from the laid-open specifications cited at the start, such as e.g. WO 98/05638, WO 01/74770, and can be prepared by the processes described therein.

Some of these processes are technically very complex, involve many stages or are encumbered with low total yields.

There was therefore furthermore a need for novel processes for the preparation of compounds of the general formula (I)

in which

A, B, W, X, Y, Z and G have the meanings given above, where X may additionally also be hydrogen, while avoiding the use of phenylacetic acid derivatives of the formula (VII).

It has already become known that for example 1,3-diketo compounds can be arylated with palladium catalysis (J. Amer. Chem. Soc. 2000, 122, 1360-70). Furthermore, it was known that Boc-protected tetramic acids can in principle be arylated starting from aryl chlorides, bromides and triflates, although the described method fails in the case of ortho substitutents (J. Org. Chem. 2009, 74, 5032-5040). Since in no example of the cited literature was a substrate with a functional NH group, as is present in tetramic acids of the formula (I), used, it was on the contrary to be assumed that such substrates may not be accessible to this reaction, especially not with ortho-substituted aryl radicals.

• (Aα) Surprisingly, a process for the preparation of compounds of the formula (I) has now been found, characterized in that, in a first step, compounds of the formula (X)

• • in which
  • A and B have the meanings given above,
  • G is the groups a), b), c) and E given above,
  • V is hydrogen or
• (Aβ) V is COOR⁸,
  • where R⁸ is alkyl (preferably C₁-C₈-alkyl)
  • and A, B and G have the meanings given above,
  • are reacted with a compound of the formula (XI)

• • in which
  • W, X, Y and Z have the meanings given above, with the exception that the halogen can now only be fluorine and chlorine, X may also additionally be hydrogen and
  • Q is triflate, bromine or iodine, preferably bromine or iodine,
  • in the presence of a base, a palladium catalyst and a phosphine ligand of the formula (XII′)

• • in which the radicals
  • R′, R″ and R′″ independently of one another are C₁-C₁₂-alkyl, C₅-C₁₀-cycloalkyl, C₆-C₁₀-aryl, which may be optionally mono- or polysubstituted by C₁-C₆-alkyl, C₁-C₆-alkoxy. C₁-C₆-alkylamino, C₁-C₆-dialkylamino, or are phenyl optionally mono- or polysubstituted by C₁-C₆-alkyl, C₁-C₆-alkoxy, C₁-C₆-alkylamino or C₁-C₆-dialkylamino,
  • in a diluent.

The bases used for the process according to the invention are generally known organic and inorganic bases. Examples of organic bases are trimethylamine, triethylamine, tributylamine, diisopropylamine, diisopropylethylamine, N,N-dimethylaniline, DABCO, DBU, pyridine, picolines, luitidines, 5-ethyl-2-methylpyridine. Examples of inorganic bases are alkali metal and alkaline earth metal hydroxides such as LiOH, NaOH, KOH, Mg(OH)₂ and Ca(OH)₂, alkali metal alcoholates such as NaOMe, NaOEt, NaOtert-butyl, KOtert-butyl, alkali metal and alkaline earth metal carbonates such as Na₂CO₃, K₂CO₃, Cs₂CO₃ and CaCO₃, alkali metal and alkaline earth metal hydrogencarbonates such as NaHCO₃, KHCO₃, alkali metal and alkaline earth metal phosphates such as Na₃PO₄, K₃PO₄ and Mg₃(PO₄)₂, alkali metal and alkaline earth metal hydrogenphosphates such as Na₂HPO₄, K₂HPO₄ and BaHPO₄, alkali metal and alkaline earth metal dihydrogenphosphates such as NaH₂PO₄, KH₂PO₄ and Ca(H₂PO₄)₂, alkali metal and alkaline earth metal hydrides such NaH, KU and CaH₂ and alkali metal and alkaline earth metal amides such as NaNH₂, KNH₂ and LiNPr₂.

Preference is given to the alkali metal and alkaline earth metal carbonates and phosphates.

In the process according to the invention, the amount of base used can be varied within wide ranges. Usually, however, at least one molar equivalent of base, based on the compound of the general formula (X), will be used. It is also possible to use the base in excesses of from 1.1 to 15, preferably 1.1 to 6, mole equivalents of base based on the compound of the general formula (X).

Suitable palladium catalysts for the process according to the invention are in principle all palladium compounds from which an active catalyst can be formed in situ under the reaction conditions. Examples are: palladium chloride, palladium bromide, palladium iodide, palladium acetate, palladium trifluoroacetate, palladium nitrate, palladium sulphate, palladium acetyl-acetonate, allylpalladium chloride dimer, bis(dibenzylideneacetone)palladium, bis(triphenyl-phosphine)palladium(II) chloride, bis(triphenylphosphine)palladium(II) bromide, tetrakis(triphenylphosphine)palladium(0), bis(acetonitrile)palladium dichloride, bis(benzo-nitrile)palladium dichloride, 1,1′-bis(diphenylphosphino)ferrocene-palladium dichloride, di-μ-chlorobis(tri-tert-butylphosphino)dipalladium(I), di-μ-bromobis(tri-tert-butylphosphino)di-palladium(I), metallic palladium such as palladium black or palladium powder, or palladium on various supports such as, for example, palladium on activated carbon, palladium on barium sulphate, palladium on calcium carbonate or palladium on aluminium oxide.

The amount of palladium catalyst to be used in the process according to the invention can be varied within wide limits. Usually, the smallest possible amount with which a good yield is nevertheless achieved will be used. Typically, the amount of palladium catalyst is between 0.001 and 10 mol per cent, based on the compound of the general formula (X). Preference is given to using amounts of from 0.01 to 5 mol per cent.

Diluents which can be used for the process according to the invention are in principle all organic solvents that are inert under the reaction conditions. Examples are: ethers such as diethyl ether, methyl tert-butyl ether, methyl cyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane; hydrocarbons such as toluene, xylenes, mesitylene, chlorobenzene, 1,2-dichlorobenzene; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidonc; dimethyl sulphoxide or sulpholane.

In the process according to the invention, highly diverse phosphine ligands of the general formula (XII′) can be used. Examples are: triphenylphosphine, tri-ortho-tolylphosphine, tri-meta-tolylphosphine, tri-para-tolylphosphine,

• benzyl-di-1-adamantylphosphine (cataCXium ABn), disodium bis(4,6-dimethyl-3-sulphonatophenyl)(2,4-dimethylphenyl)phosphine, trisodium tris(4,6-dimethyl-3-sulphonato-phenyl)phosphine, butyl di-1-adamantylphosphine (cataCXium A), tributylphosphine, tricyclohexylphosphine, tri-tert-butylphosphine, 2-di-tert-butylphosphino-1,1′-binaphthyl, 2-di-tert-butylphosphino-1,1′-biphenyl, 2-dicyclohexylphosphinobiphenyl, 2-di-tert-butylphosphino-2′-(N,N-dimethylamino)biphenyl, 2-dicyclohexylphosphino-2′-(N,N-dimethylamino)biphenyl, 2-di-tert-butylphosphino-2′-methylbiphenyl, 2-dicyclohexylphosphino-2′-methylbiphenyl, 2-dicyclohexylphosphino-2′-isopropylbiphenyl, 2-di-tert-butylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl, 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl, 2-diphenylphosphino-2′-(N,N-dimethylamino)biphenyl, 2-dicyclohexylphosphino-2′,6′-diisopropoxy-1,1′-biphenyl (RuPhos), N-(2-methoxyphenyl)-2-(di-tert-butylphosphino)pyrrole, N-phenyl-2-(di-tert-butyl-phosphino)pyrrole, 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (XANTPHOS). 9,9-dimethyl-4,5-bis(di-tert-butylphosphino)xanthene, bis(2-diphenylphosphinophenyl) ether (DPEphos), 2,2′-bis(diphenylphosphino)-1,1′-biphenyl (BIPHEP), 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (BINAP), 1,1′-bis(diphenylphosphino)ferrocene (DPPF).

The amount of phosphine ligands of the general formula (XII′) to be used in the process according to the invention is between 0.25 and 5 mol per mol of palladium catalyst. Preference is given to using between 0.5 and 2.5 mol per mol.

The reaction temperature for the process according to the invention can be varied within wide limits. Usually, the operating temperature is between 20 and 200° C., preferably between 50 and 180° C.

The process according to the invention is usually carried out at atmospheric pressure with the exclusion of atmospheric oxygen and moisture. However, the process can in principle also be carried out under reduced or increased pressure.

When carrying out the process according to the invention, it is possible to use the compounds of the formula (XI) in a relatively large excess (up to 10 mol, preferably up to 2 mol).

Some compounds of the formula (X) where G=hydrogen and substituted benzoyl are known in part from WO 94/01401, and also the literature stated therein, and some are novel.

The compounds of the formula (X)

where

• A, B and the carbon atom to which they are bonded are preferably saturated C₅-C₆-cycloalkyl, in which one ring member is replaced by oxygen or sulphur and which is optionally mono- or disubstituted by C₁-C₆-alkyl or C₁-C₆-alkoxy or
• A, B and the carbon atom to which they are bonded are preferably C₃-C₆-cycloalkyl, in which optionally one ring member is replaced by nitrogen and which is mono- or disubstituted, independently of one another, by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen, C₃-C₈-alkenyloxy, C₁-C₆-alkoxy-C₁-C₆-alkyl, C₃-C₆-cycloalkyl-C₁-C₂-alkoxy, C₃-C₁₀-cycloalkyl, C₁-C₈-haloalkyl, C₂-C₆-haloalkoxy or C₁-C₆-alkoxy-C₁-C₄-alkoxy, where the aforementioned radicals (with the exception of halogen and C₁-C₈-haloalkyl) are also suitable as N substituents and C₁-C₈-alkyl is only permitted in the event of a disubstitution, or
• A, B and the carbon atom to which they are bonded are preferably C₅-C₆-cycloalkyl which is substituted by an alkylenediyl group or by an alkylenedioxyl group or by an alkylenedithioyl group which optionally contains one or two non-directly adjacent oxygen and/or sulphur atoms and which is optionally substituted by C₁-C₄-alkyl, and which, with the carbon atom to which it is bonded, forms a further five- to eight-membered ring,
• G is preferably hydrogen (a) or one of the groups

in which

• E is a metal ion or an ammonium ion,
• R¹ is preferably C₁-C₈-alkyl, C₂-C₈-alkenyl, C₁-C₄-alkoxy-C₁-C₂-alkyl, C₁-C₄-alkylthio-C₁-C₂-alkyl each of which is optionally mono- to trisubstituted by fluorine or chlorine, or C₃-C₆-cycloalkyl optionally mono- to disubstituted by fluorine, chlorine, C₁-C₂-alkyl or C₁-C₂-alkoxy, in which optionally one or two non-directly adjacent ring members are replaced by oxygen,
  • is phenyl optionally mono- to disubstituted by fluorine, chlorine, bromine, cyano, nitro, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₂-haloalkyl or C₁-C₂-haloalkoxy,
• R² is preferably C₁-C₈-alkyl, C₂-C₈-alkenyl or C₁-C₄-alkoxy-C₂-C₄-alkyl each of which is optionally mono- to trisubstituted by fluorine,
  • is C₃-C₆-cycloalkyl optionally monosubstituted by C₁-C₂-alkyl or C₁-C₂-alkoxy, or
  • is phenyl or benzyl each of which is optionally mono- to disubstituted by fluorine, chlorine, bromine, cyano, nitro, C₁-C₄-alkyl, C₁-C₃-alkoxy, trifluoromethyl or trifluoromethoxy,
• V is preferably hydrogen (X-1) or COOR⁸ (X-2),
  • in which R⁸ is preferably C₁-C₈-alkyl,are novel and likewise part of the invention.

Taking into consideration the various meanings (a), (b), (c) and (d) of group G, the following primary structures (X-1-a) to (X-1-d) arise when V is hydrogen,

in which

• A, B, E, R¹ and R² have the meanings given above.

Taking into consideration the various meanings (a), (b), (c) and (d) of group G, the following primary structures (X-2-a) to (X-2-d) arise when V is COOR⁸,

in which

• A, B, E, R¹, R² and R⁸ have the meanings given above.

The compounds according to the invention are generally defined by the formula (X). Preferred substituents and/or ranges of the radicals listed in the formulae mentioned above and below are explained hereinbelow:

• A, B and the carbon atom to which they are bonded are particularly preferably saturated C₅-C₆-cycloalkyl, in which one ring member is replaced by oxygen or sulphur and which is optionally mono- to disubstituted by C₁-C₄-alkyl or C₁-C₄-alkoxy, or
• A, B and the carbon atom to which they are bonded are particularly preferably saturated C₃-C₇-cycloalkyl in which optionally one ring member is replaced by nitrogen and which is mono- to disubstituted, independently of one another, by C₁-C₆-alkyl, chlorine, fluorine, C₁-C₄-alkoxy-C₁-C₂-alkyl, trifluoromethyl, C₁-C₆-alkoxy, C₃-C₆-alkenyloxy, trifluoroethoxy, C₁-C₃-alkoxy-C₁-C₃-alkoxy or C₃-C₆-cycloalkylmethoxy, where the aforementioned radicals (with the exception of fluorine, chlorine and trifluoromethyl) are also suitable as N-substituents and C₁-C₆-alkyl is only permitted in the event of a disubstitution, or
• A, B and the carbon atom to which they are bonded are particularly preferably saturated C₅-C₆-cycloalkyl which is substituted by an alkylenediyl group or by an alkylenedioxyl group or by an alkylenedithiol group which optionally contains one or two non-directly adjacent oxygen or sulphur atoms and is optionally mono- or disubstituted by methyl or ethyl and which, with the carbon atom to which it is bonded, forms a further five- or six-membered ring,
• G is particularly preferably hydrogen (a) or one of the groups

in which

• E is particularly preferably a metal ion or an ammonium ion,
• R¹ is particularly preferably C₁-C₆-alkyl, C₂-C₆-alkenyl, C₁-C₂-alkoxy-C₁-alkyl, C₁-C₂-alkylthio-C₁-alkyl each of which is optionally monosubstituted by chlorine, or cyclopropyl or cyclohexyl each of which is optionally monosubstituted by fluorine, chlorine, methyl or methoxy,
  • is phenyl optionally monosubstituted by fluorine, chlorine, bromine, cyano, nitro, methyl, methoxy, trifluoromethyl or trifluoromethoxy,
• R² is particularly preferably C₁-C₈-alkyl, C₂-C₆-alkenyl or C₁-C₄-alkoxy-C₂-C₃-alkyl, phenyl or benzyl each of which is optionally monosubstituted by fluorine,
• V is particularly preferably hydrogen or COOR⁸,
  • in which R⁸ is particularly preferably C₁-C₆-alkyl.
• A, B and the carbon atom to which they are bonded are very particularly preferably saturated C₅-C₆-cycloalkyl in which one ring member is replaced by oxygen and which is optionally monosubstituted by methyl, ethyl, methoxy or ethoxy, or
• A, B and the carbon atom to which they are bonded are very particularly preferably saturated C₅-C₆-cycloalkyl in which optionally one ring member is replaced by nitrogen and which is mono- or disubstituted, independently of one another, by methyl, ethyl, trifluoromethyl, fluorine, methoxymethyl, ethoxymethyl, methoxyethyl, ethoxyethyl, methoxy, ethoxy, propoxy, butoxy, methoxyethoxy, ethoxyethoxy, allyloxy, trifluoroethoxy or cyclopropylmethoxy, where the aforementioned radicals (with the exception of fluorine and trifluoromethyl) are also suitable as N substituents and methyl or ethyl is only permitted in the event of a disubstitution, and or
• A, B and the carbon atom to which they are bonded are very particularly preferably C₆-cycloalkyl which is optionally substituted by an alkylidenediyl group optionally interrupted by an oxygen atom, or by an alkylenedioxy group containing with two non-directly adjacent oxygen atoms, where a 5- or 6-ring ketal is formed, each of which can optionally be mono- or disubstituted by methyl,
• G is very particularly preferably hydrogen (a) or one of the groups

in which

• E is very particularly preferably a Li⁺, Na⁺, K⁺ or Cs⁻,
• R¹ is very particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, cyclopropyl or cyclohexyl,
• R² is very particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, phenyl or benzyl,
• V is very particularly preferably hydrogen or COOR⁸,
  • in which R⁸ is very particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl.
• A, B and the carbon atom to which they are bonded are most notably saturated C₆-cycloalkyl in which one ring member is replaced by oxygen or
• A, B and the carbon atom to which they are bonded are most notably saturated C₆-cycloalkyl which is disubstituted by fluorine or monosubstituted by methoxy, or
• A, B and the carbon atom to which they are bonded are most notably C₆-cycloalkyl which is substituted by an alkylenediyl group containing with two non-directly adjacent oxygen atoms, which, with the carbon atom to which it is bonded, forms a further five-membered ring,
• G is most notably hydrogen (a) or

• where R² is most notably ethyl,
• V is most notably hydrogen (X−1) or COOR⁸ (X-2),
• where R⁸ is most notably methyl.

The radical definitions and explanations listed in general above or listed within preferred ranges can be combined as desired with one another, thus also between the respective ranges and preferred ranges. They apply accordingly for the end products and also for the pre-products and intermediates.

According to the invention, preference is given to the compounds of the formula (X) in which a combination of the meanings listed above as preferred (preferably) is present.

According to the invention, particular preference is given to the compounds of the formula (X) in which a combination of the meanings listed above as particularly preferred is present.

According to the invention, very particular preference is given to the compounds of the formula (X) in which a combination of the meanings listed above as very particularly preferred is present.

Emphasis is placed on compounds of the formula (X) in which G is hydrogen.

Saturated or unsaturated hydrocarbon radicals such as alkyl, alkanediyl or alkenyl can, including in combination with heteroatoms, such as e.g. in alkoxy, if possible, in each case be straight-chain or branched.

Unless stated otherwise, optionally substituted radicals can be mono- or polysubstituted, where in the case of polysubstitutions the substituents can be identical or different.

Specifically, apart from compounds specified in the examples, the following compounds of the formula (X) where G=H may be specified:

TABLE 1
A	B	V
—(CH2)2—O—(CH2)2—	H
—CH2—O—(CH2)3—	H
—(CH2)2—S—(CH2)2—	H
—CH2—CHCH3—(CH2)3—	H
—CH2—CHOCH3—(CH2)2—	H
—CH2—CHOC2H5—(CH2)2—	H
—CH2—CHOC3H7—(CH2)2—	H
—CH2—CHOC4H9—(CH2)2—	H
—CH2—CHO(CH2)2OCH3—(CH2)2—	H
	H
—CH2—CHOCH3—(CH2)3—	H
—CH2—CHOC2H5—(CH2)3—	H
—CH2—CHOC3H7—(CH2)3—	H
—CH2—CHOC4H9—(CH2)3—	H
—CH2—CHO(CH2)2OCH3—(CH2)3—	H
	H
—(CH2)2—CHOCH3—(CH2)2—	H
—(CH2)2—CHOC2H5—(CH2)2—	H
—(CH2)2—CHOC3H7—(CH2)2—	H
—(CH2)2—CHO—CH2CF3—(CH2)2—	H
—(CH2)2—C(CH3)2—(CH2)2—	H
—CH2—(CHCH3)2—(CH2)2—	H
—(CH2)2—CF2—(CH2)2—	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H
	H

Table 2 A and B as given in Table 1 and V=COOCH₃

Table 3 A and B as given in Table 1 and V=COOC₂H₅

• (B) Compounds of the formula (X-2-a)

• in which A, B and R⁸ have the meanings given above,are obtained whencompounds of the formula (XII)

in which

• A, B and R⁸ have the meanings given above,are intramolecularly condensed in the presence of a diluent and in the presence of a base.
• (C) Moreover, compounds of the formula (X-1-a)

in which

A and B have the meanings given above,

are obtained when

compounds of the formula (X-2-a)

in which A, B and R⁸ have the meanings given above,are hydrolysed and then decarboxylated.

Furthermore, it has been found

• (D) that the compounds of the formulae (X-1-b) or (X-2-b) shown above in which A, B and V have the meanings given above are obtained when compounds of the formulae (X-1-a) and (X-2-a) shown above in which A, B and V have the meanings given above, are reacted in each case
• α) with compounds of the formula (III)

in which

• R¹ has the meaning given above and
• Hal is halogen (in particular chlorine or bromine)or
• β) with carboxylic anhydrides of the formula (IV)R¹—CO—O—CO—R¹  (IV)in which
• R¹ has the meaning given above,optionally in the presence of a diluent and optionally in the presence of an acid binder,
• (E) that the compounds of the formulae (X-1-c) or (X-2-c) shown above in which R², A, B and V have the meanings given above are obtained when compounds of the formulae (X-1-a) and (X-2-a) shown above in which A, B and V have the meanings given above,are reacted with chloroformic acid esters of the formula (V)R²—O—CO—Cl  (V)in which
• R² has the meaning given above,optionally in the presence of a diluent and optionally in the presence of an acid binder;
• (F) that compounds of the formulae (X-1-d) and (X-2-d) shown above in which E, A, B and V have the meanings given above are obtained when compounds of the formulae (X-1-a) and (X-1-b) in which A, B and V have the meanings given above are in each case reactedwith metal compounds or amines of the formulae (XIII) or (XIV)

in which

• Me is a mono- or divalent metal (preferably an alkali metal or alkaline earth metal such as lithium, sodium, potassium, caesium, magnesium or calcium),
• t is the number 1 or 2 and
• R¹⁰, R¹¹, R¹², independently of one another, are hydrogen or alkyl (preferably C₁-C₈-alkyl), where in the case of Me R¹⁰ may also be the group COO or HCOOoptionally in the presence of a diluent.

If, for example, according to process (Aα), 8-methoxy-1-azaspiro[4,5]-decane-2,4-dione and 2,5-dimethylbromobenzene are used as starting materials, then the course of the reaction can be depicted by the following scheme:

If, for example, according to process (Aβ), 3-methoxycarbonyl-8-methoxy-1-azaspiro-[4,5]-decane-2,4-dione and 2,5-dimethylbromobenzene are used as starting compounds, then the course of the process according to the invention can be depicted by the following reaction scheme:

If, for example, according to process (B), N-ethoxycarbonylacetyl-1-amino-4-methoxycyclohexanecarboxylic acid ethyl ester is used as starting material, then the course of the process according to the invention can be depicted by the following reaction scheme:

If, for example, according to process (C), 3-methoxycarbonyl-8-methoxy-1-azaspiro[4,5]decane-2,4-dione and an excess of aqueous base are used as starting materials, then the course of the reaction can be depicted by the following reaction scheme:

If, for example, according to process (Dα), 8-methoxy-1-azaspiro[4,5]decane-2,4-dione and acetyl chloride are used as starting materials, then the course of the process according to the invention can be depicted by the following reaction scheme:

If, for example, according to process (D β), 8-methoxy-1-azaspiro-[4,5]-decane-2,4-dione and acetic anhydride are used as starting materials, then the course of the process according to the invention can be depicted by the following reaction scheme:

If, for example, according to process (E), 8-methoxy-1-azaspiro[4,5]decane-2,4-dione and chloroformic acid ethyl ester are used as starting compounds, then the course of the process according to the invention can be depicted by the following reaction scheme:

If, for example, according to process (F), 8-methoxy-1-azaspiro[4,5]decane-2,4-dione and for example sodium hydroxide (equimolar) are used as starting materials, then the course of the reaction can be depicted as follows:

The compounds of the formula (XII) required as starting materials in the process (B) according to the invention

in which

• A, B and R⁸ have the meanings given above,are novel.

The acylamino acid esters of the formula (XII) are obtained for example when amino acid derivatives of the formula (XV)

in which

• A, B and R⁸ have the meaning given above,are acylated with substituted malonic acid half-ester chlorides of the formula (XVI)

in which R⁸ has the meanings given above,

(Chem. Reviews 52, 237-416 (19953); Bhattacharya, Indian J. Chem. 6, 341-5, 1968).

Furthermore, the starting materials of the formula (XII) used in the above process (B)

in which

• A, B and R⁸ have the meanings given above, can be prepared when 1-aminocarbonitriles of the formula (XVII)

in which

• A and B have the meanings given above,are reacted with malonic acid half-ester chlorides of the formula (XVI)

in which R⁸ has the meanings given above,to give compounds of the formula (XVIII)

in which

• A, B and R⁸ have the meanings given above,and the latter are then subjected to an acidic alcoholysis.

The compounds of the formula (XVIII) are likewise novel and can be prepared analogously to known processes which are described in the literature cited at the start or e.g. as in EP-A-595 130. Some of the compounds of the formula (XVII) are commercially available, some are known, e.g. WO 2008/128058, and some are also novel and can be prepared e.g. as described in EP-A-595 130.

Moreover, the starting materials of the formula (XII) used in the above process (B)

in which

• A, B and R⁸ have the meanings given above,can be prepared when 1-aminocarbonitriles of the formula (XVII)

in which

• A and B have the meanings given above,are reacted with cyanoacetic acid of the formula (XIX)

to give compounds of the formula (XX)

in which

• A and B have the meanings given above,and the latter are then subjected to an acidic alcoholysis.

The compounds of the formula (XX) are likewise novel and can be prepared analogously by known processes which are described in the literature cited at the start.

The acid halides of the formula (III), carboxylic anhydrides of the formula (IV), chloroformic acid esters of the formula (V) and metal hydroxides, metal alkoxides, metal carbonates, metal hydrogencarbonates or amines of the formula (XIII) and (XIV) further required as starting materials for carrying out the processes (D), (E) and (F) according to the invention are generally known compounds in organic or inorganic chemistry.

Moreover, the compounds of the formulae (XV) and (XVII) are known from the patent applications cited at the start and/or can be prepared by the methods given therein.

The compounds of the formulae (XVI) and (XIX) are commercially available.

The process (B) is characterized in that compounds of the formula (XII) in which A, B and R⁸ have the meanings given above are subjected to an intramolecular condensation in the presence of a diluent and in the presence of a base.

Diluents which can be used in the process (B) according to the invention are all organic solvents that are inert towards the reaction participants. The following can preferably be used: hydrocarbons, such as toluene and xylene, also ethers, such as dibutyl ether, tetrahydrofuran, dioxane, glycol dimethyl ether and diglycol dimethyl ether, also polar solvents, such as dimethyl sulphoxide, sulpholane, dimethylformamide and N-methylpyrrolidone, and also alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol and tert-butanol.

All customary proton acceptors can be used as base (deprotonization agent) when carrying out the process (B) according to the invention. The following can preferably be used: alkali metal and alkaline earth metal oxides, hydroxides and carbonates, such as sodium hydroxide, potassium hydroxide, magnesium oxide, calcium oxide, sodium carbonate, potassium carbonate and calcium carbonate, which can also be used in the presence of phase transfer catalysts such as e.g. triethylbenzylammonium chloride, tetrabutylanmmonium bromide, Adogen 464 (=methyltrialkyl(C₈-C₁₀)ammonium chloride) or TDA 1 (=tris(methoxyethoxyethyl)amine). Furthermore, alkali metals such as sodium or potassium can be used. It is also possible to use alkali metal and alkaline earth metal amides and hydrides, such as sodium amide, sodium hydride and calcium hydride, and moreover also alkali metal alcoholates, such as sodium methylate, sodium ethylate and potassium tert-butylate.

The reaction temperature can be varied within a relatively large range when carrying out the process (B) according to the invention. In general, working temperatures are between −75° C. and 200° C., preferably between −50° C. and 150° C. The process (A) according to the invention is generally carried out under atmospheric pressure.

When carrying out the process (B) according to the invention, the reaction component of the formula (XII) and the deprotonating base are generally used in equimolar amounts to about double-equimolar amounts. However, it is also possible to use the one or other component in a relatively large excess (up to 3 mol).

The process (C) is characterized in that compounds of the formula (X-2) in which A, B and R⁸ have the meanings given above are hydrolysed and decarboxylated in the presence of a diluent and optionally in the presence of a base or acid.

Diluents which can be used in the process (C) according to the invention are all organic solvents which are inert towards the reaction participants. The following can preferably be used: ethers, such as tetrahydrofuran, dioxane, glycol dimethyl ether and diglycol dimethyl ether, moreover polar solvents, such as dimethyl sulphoxide, sulpholane, dimethyl formamide and N-methylpyrrolidone, and also alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol and tert-butanol, but also water.

When carrying out the process (C) according to the invention, all customary lye-forming bases can be used as base. The following can preferably be used: alkali metal and alkaline earth metal oxides, hydroxides and carbonates, such as lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium oxide, calcium oxide, sodium carbonate, potassium carbonate and calcium carbonate.

When carrying out the process (C) according to the invention, all customary inorganic and organic acids can be used as acids. As inorganic acids, the following can preferably be used: e.g. hydrochloric acid, sulphuric acid, phosphoric acid and nitric acid. As organic acids, the following can preferably be used, e.g. formic acid, acetic acid, trifluoroacetic acid, oxalic acid, citric acid and aqueous solutions thereof.

As a special feature, the compounds of the formula (X-2) used in the process (C) can also be used autocatalytically as acid.

When carrying out the process (C) according to the invention, the reaction temperature can be varied within a relatively large range. In general, working temperatures are between −20° C. and 200° C., preferably between 0° C. and 150° C. The process (C) according to the invention is generally carried out under atmospheric pressure.

When carrying out the process (C) according to the invention, the reaction component of the formula (X-2) and the base or the acid are generally used in equimolar amounts up to about double-equimolar amounts. However, it is also possible to use the base or the acid in a relatively large excess, or else catalytically.

The process (D_α) is characterized in that compounds of the formulae (X-1) or (X-2) are in each case reacted with carboxylic acid halides of the formula (III), optionally in the presence of a diluent and optionally in the presence of an acid binder.

Diluents which can be used in the process (D_α) according to the invention are all solvents which are inert towards the acid halides. The following can preferably be used: hydrocarbons, such as benzine, benzene, toluene, xylene and tetralin, also halogenated hydrocarbons, such as methylene chloride, chloroform, tetrachloromethane, chlorobenzene and o-dichlorobenzene, moreover ketones, such as acetone and methyl isopropyl ketone, also ethers, such as diethyl ether, tetrahydrofuran and dioxane, moreover carboxylic acid esters, such as ethyl acetate, and also strongly polar solvents, such as diinethylformamide, dimethyl sulphoxide and sulpholane. If the hydrolysis stability of the acid halide allows it, the reaction can also be carried out in the presence of water.

In the reaction according to the process (D_α) according to the invention, suitable acid binders are all customary acid acceptors. The following can preferably be used: tertiary amines, such as triethylamine, pyridine, diazabicyclooctane (DABCO), diazabicycloundecene (DBU), diazabicyclononene (DBN), Hünig base and N,N-dimethylaniline, also alkaline earth metal oxides, such as magnesium oxide and calcium oxide, moreover alkali metal and alkaline earth metal carbonates, such as sodium carbonate, potassium carbonate and calcium carbonate, and also alkali metal hydroxides such as sodium hydroxide and potassium hydroxide.

The reaction temperature during the process (D_α) according to the invention can be varied within a relatively large range. In general, working temperatures are between −20° C. and +150° C., preferably between 0° C. and 100° C.

When carrying out the process (D_α) according to the invention, the starting materials of the formulae (X-1) or (X-2) and the carboxylic acid halide of the formula (III) are generally used in each case in approximately equivalent amounts. However, it is also possible to use the carboxylic acid halide in a relatively large excess (up to 5 mol). Work-up takes place in accordance with customary methods.

The process (D_β) is characterized in that compounds of the formulae (X-1) or (X-2) are reacted in each case with carboxylic anhydrides of the formula (IV) optionally in the presence of a diluent and optionally in the presence of an acid binder.

Diluents which can be used in the process (D_β) according to the invention are preferably those diluents which are also preferably contemplated in the case of the use of acid halides. Moreover, a carboxylic acid anhydride used in excess can also simultaneously act as diluent.

Suitable optionally added acid binders in the process (D_β) are preferably those acid binders which are also preferably contemplated in the case of the use of acid halides.

The reaction temperature during the process (D_α) according to the invention can be varied within a relatively large range. In general, working temperatures are between −20° C. and +150° C., preferably between 0° C. and 100° C.

When carrying out the process (D_β) according to the invention, the starting materials of the formulae (X-1) or (X-2) and the carboxylic acid anhydride of the formula (IV) are generally used in each case in approximately equivalent amounts. However, it is also possible to use the carboxylic acid anhydride in a relatively large excess (up to 5 mol). Work-up takes place in accordance with customary methods.

The procedure generally involves removing diluent and carboxylic acid anhydride, which is present in excess, and also the resulting carboxylic acid by distillation or by washing with an organic solvent or with water.

The process (E) is characterized in that compounds of the formulae (X-1) or (X-2) are in each case reacted with chloroformic acid esters of the formula (V), optionally in the presence of a diluent and optionally in the presence of an acid binder.

Suitable acid binders in the process (E) according to the invention are all customary acid acceptors. The following can preferably be used: tertiary amines, such as triethylamine, pyridine, DABCO, DBU, DBN, Hünig base and N,N-dimethylaniline, also alkaline earth metal oxides, such as magnesium oxide and calcium oxide, furthermore alkali metal and alkaline earth metal carbonates, such as sodium carbonate, potassium carbonate and calcium carbonate, and also alkali metal hydroxides such as sodium hydroxide and potassium hydroxide.

Diluents which can be used in the process (E) according to the invention are all solvents that are inert towards the chloroformic acid esters. The following can preferably be used: hydrocarbons, such as benzine, benzene, toluene, xylene and tetralin, also halogenated hydrocarbons, such as methylene chloride, chloroform, tetrachloromethane, chlorobenzene and o-dichlorobenzene, furthermore ketones, such as acetone and methyl isopropyl ketone, also ethers, such as diethyl ether, tetrahydrofuran and dioxane, moreover carboxylic acid esters, such as ethyl acetate, moreover nitriles such as acetonitrile and also strongly polar solvents, such as dimethylformamide, dimethylsulphoxide and sulpholane.

When carrying out the process (E) according to the invention, the reaction temperature can be varied within a relatively large range. The reaction temperature is generally between −20° C. and +100° C., preferably between 0° C. and 50° C.

The process (E) according to the invention is generally carried out under atmospheric pressure.

When carrying out the process (E) according to the invention, the starting materials of the formulae (X-1) or (X-2) and the corresponding chloroformic acid ester of the formula (V) are generally used in each case in approximately equivalent amounts. However, it is also possible to use the one or other component in a relatively large excess (up to 2 mol). Work-up takes place by customary methods. In general, the procedure involves removing precipitated salts and concentrating the remaining reaction mixture by drawing off the diluent.

The process (F) is characterized in that compounds of the formulae (X-1) or (X-2) are in each case reacted with metal amides, metal hydrides, metal hydroxides, metal alkoxides, metal carbonates or metal hydrogencarbonates of the formula (XIII) or amines of the formula (XIV), which are specified in the case of the process (A) according to the invention, optionally in the presence of a diluent.

Diluents which can be used in the process (F) according to the invention are preferably the solvents specified in the case of process (A), but also alcohols such as methanol, ethanol, isopropanol, and also water. The process (F) according to the invention is generally carried out under atmospheric pressure. The reaction temperature is generally between −20° C. and 100° C., preferably between 0° C. and 50° C.

PREPARATION EXAMPLES

Note: Me stands for methyl; Et stands for ethyl

Example 1

5,5-Dimethyl-3-phenylpyrrolidine-2,4-dione

Under argon, in a heat-dried apparatus, 23 mg of Pd(OAc)₂, 69 mg of di-tert-butyl(2′-methylbiphenyl-2-yl)phosphine and 2.44 g of K₃PO₄ in 15 ml of air-free dioxane are introduced as initial charge. 763 mg of 5,5-dimethylpyrrolidine-2,4-dione and 785 mg of bromobenzene are added and the mixture is stirred for 16 hours under reflux. The mixture is then left to cool to room temperature, diluted with 20 ml of methanol and filtered, and the filter residue is after-washed with 10 ml of MeOH. The combined filtrates are concentrated by evaporation on a rotary evaporator. The residue is taken up in 20 ml of water and rendered weakly acidic using dilate hydrochloric acid. The precipitated solid is filtered off with suction and washed with 10 ml of water. It is then washed from the filter with acetone and the filtrate is concentrated by evaporation. This gives 1.01 g of solid with a purity of 93.8% according to GC/MS.

GC/MS: m/e=203 (M⁺, 20%), 118 (M-NHCMe₂CO, 100%).

¹H-NMR (400 MHz, d-DMSO): δ =1.35 (s, 6H), 7.13-7.17 (m, 1H), 7.28-7.32 (m, 2H), 7.65 (s, 1H), 7.91-7.93 (m, 2H), 11.08 (s, 1H) ppm.

Example 2

5,5-Dimethyl-3-(2-methylphenyl)pyrrolidine-2,4-dione

The procedure is as in Example 1, except that 855 mg of 2-bromotoluene are used instead of bromobenzene. This gives 0.84 g of solid with a purity according to GC/MS of 86.3%.

GC/MS: m/e=217 (M⁺, 30%), 132 (M-NHCMe₂CO, 100%).

Example 3

5,5-Dimethyl-3-(3-methylphenyl)pyrrolidine-2,4-dione

The procedure is as in Example 1, except that 855 mg of 3-bromotoluene are used instead of bromobenzene. This gives 1.17 g of solid with a purity according to GC/MS of 92%.

GC/MS: m/e=217 (M⁺, 20%), 132 (M-NHCMe₂CO, 100%).

Example 4

5,5-Dimethyl-3-(3-methylphenyl)pyrrolidine-2,4-dione

Under argon, in a heat-dried apparatus, 1.0 g of solid sodium hydroxide (in the form of so-called “Micropills”) and 15 ml of water- and air-free N-methylpyrrolidone (NMP) are introduced as initial charge. With stirring, 1.907 g of 5,5-dimethylpyrrolidine-2,4-dione are then added and the mixture is stirred for 20 minutes at room temperature. 1.71 g of 3-bromotoluene are then added and the reaction mixture is heated to 125° C. At this temperature, 0.328 g of triphenylphosphine and 89 mg of PdCl2 are then added. The mixture is stirred for 4 hours at 125° C., left to cool to room temperature, stirred into 20 ml of ice-water and adjusted to pH 2 using dilute hydrochloric acid. 20 ml of methylene chloride are added, the mixture is stirred, the phases are separated and the aqueous phase is extracted by shaking two more times with 10 ml of methylene chloride in each case. The combined organic phases are dried and then concentrated on a rotary evaporator. This gives 1.82 g of target product (corresponding to a yield of 84% of theory).

Example 5

3-(4-Chloro-2-methylphenyl)-5,5-dimethylpyrrolidine-2,4-dione

The procedure is as in Example 1, except that 1.03 g of 2-bromo-5-chlorotoluene are used instead of bromobenzene. This gives 1.37 g of solid with a purity according to GC/MS of 94.3%.

GC/MS: m/e=251 (M⁺ for ³⁵Cl, 25%), 166 (M-NHCMe₂CO, 100%).

Example 6

3-(Biphenyl-3-yl)-5,5-dimethylpyrrolidine-2,4-dione

The procedure is as in Example 1, except that 1.166 g of 3-bromobiphenyl are used instead of bromobenzene. This gives 1.52 g of solid with a purity according to GC/MS of 95.4%.

GC/MS: m/e=279 (M⁺, 35%), 194 (M-NHCMe₂CO, 90%), 165 (100%).

Example 7

3-(2,5-Dimethylphenyl)-5,5-dimethylpyrrolidine-2,4-dione

The procedure is as in Example 1, except that 0.926 g of 2,5-dimethylbromobenzene are used instead of bromobenzene. This gives 1.21 g of solid with a purity according to GC/MS of 90%.

GC/MS: m/e=231 (M⁺, 20%), 146 (M-NHCMe₂CO, 100%).

Example 8

8-Methoxy-3-phenyl-1-azaspiro[4.5]decane-2,4-dione

The procedure is as in Example 1, except that 1.18 g of 8-methoxy-1-azaspiro[4.5]decane-2,4-dione are used instead of 5,5-dimethylpyrrolidine-2,4-dione. This gives approximately 336 mg of the title compound.

GC/MS: m/e=273 (M⁺, 15%), 241 (M-MeOH, 5%), 118 (PhCHCO; 100%).

Example 9

2,2-Dimethyl-5-oxo-4-phenyl-2,5-dihydro-1H-pyrrol-3-yl ethylcarbonate

The procedure is as in Example 1, except that 1.195 g of 2,2-dimethyl-5-oxo-2,5-dihydro-1H-pyrrol-3-yl ethylcarbonate are used instead of 5,5-dimethylpyrrolidine-2,4-dione. This gives the title compound in a yield of 69% of theory.

GC/MS: m/e=275 (M⁺, 2%), 203 (M-72, 80%), 188 (100%), 145 (95%), 118 (M-EtOCO, —NHCMe₂CO, 70%), 89 (100%).

Example 10

2,2-Dimethyl-5-oxo-4-phenyl-2,5-dihydro-1H-pyrrol-3-yl acetate

The procedure is as in Example 1, except that 1.015 g of 2,2-dimethyl-5-oxo-2,5-dihydro-1H-pyrrol-3-yl acetate are used instead of 5,5-dimethylpyrrolidine-2,4-dione. This gives the title compound in a yield of about 35% of theory. Additionally, as a result of in situ elimination of the acetyl radical, 5,5-dimethyl-3-phenylpyrrolidine-2,4-dione is obtained in a yield of approximately 38% of theory.

GC/MS: m/e=245 (M⁺, 2%), 203 (M-42, 100%), 188 (60%), 118 (80%), 43 (50%).

Example 11

8-Methoxy-3-phenyl-1-azaspiro[4.5]decane-2,4-dione

The procedure is as in Example 1, except that 1.532 g of methyl 8-methoxy-2,4-dioxo-1-azaspiro[4.5]decane-3-carboxylate as in Example (X-2-a-1) are used instead of 5,5-dimethylpyrrolidine-2,4-dione. This gives the title compound in a yield of approximately 90% of theory.

Example 12

3-(4-Chloro-2-methylphenyl)-8-methoxy-1-azaspiro[4]decane-2,4-dione

The procedure is as in Example 11, except that 1.03 g of 2-bromo-5-chlorotoluene are used instead of bromobenzene. This gives the title compound in a yield of approximately 22% of theory.

GC/MS: m/e=321 (M⁺ for ³⁵Cl, 20%), 290 (M-31, 20%), 166 (100%).

Example 13

3-(2,5-Dimethylphenyl)-8-methoxy-1-azaspiro[4]decane-2,4-dione

The procedure is as in Example 11, except that 0.925 g of 2,5-dimethylbromobenzene are used instead of bromobenzene. This gives the title compound in a yield of approximately 20% of theory.

GC/MS: m/e=301 (M⁺ 20%), 270 (M-31, 20%), 146 (100%).

Example 14

3-[3-(4-chlorophenyl)-6-methylphenyl]-5,5-dimethylpyrrolidine-2,4-dione

Under argon, in a heat-dried apparatus, 7.4 mg of Pd(OAc), 22 mg of di-tert-butyl(2′-methylbiphenyl-2-yl)phosphine and 0.78 g of K₃PO₄ in 4.8 ml of air-free dioxane are introduced as initial charge. 203 mg of 5,5-dimethylpyrrolidine-2,4-dione and 659 mg of 3-(4-chlorophenyl)-6-methylbromobenzene are added and the mixture is stirred for 16 hours under reflux. The mixture is 10 then left to cool to room temperature, diluted with ca. 6 ml of methanol and filtered, and the filter residue is after-washed with ca. 3 ml of MeOH. The combined filtrates are concentrated by evaporation on a rotary evaporator. The residue is taken up in ca. 6 ml of water and rendered weakly acidic using 1 N hydrochloric acid. The precipitated solid is filtered off with suction and washed with ca. 3 ml of water. It is then washed from the filter with acetone and the filtrate is concentrated by evaporation. This gives 0.597 g of solid. Reversed-phase separation with water/acetonitrile (gradient) gives 93 mg (14% of theory) with a purity of 98.6% according to HPLC/MS.

¹H-NMR (400 MHz, d₆-DMSO): δ =1.36 (s, 6H, 2×CH₃), 2.20 (s, 3H, Ar—CH₃), 7.29-7.31 (d, 1H, ArH), 7.35 (d, 1H, ArH), 7.47-7.51 (m, 3H, ArH), 7.61 (br, 1H, NH), 7.63-7.67 (m, 2H, ArH), 10.83 (s, br, 1H, OH) ppm.

Example (X-1-a-1)

500 mg (1.9 mmol) of the compound according to Ex. X-2-a-4 are introduced in portions into a boiling 50% strength ethanol/water mixture over the course of 5 minutes. The mixture is stirred under reflux until the evolution of CO₂ has finished, the mixture is concentrated on a rotary evaporator, and the residue is recrystallized from ethanol. This gives 275 mg of a colourless powder (69% of theory).

¹H-NMR (400 MHz, CDCl₃): δ =1.79-1.84 (m. 2H). 1.94-2.11 (2m, 4H), 2.20-2.33 (m, 2H), 3.13 (s, 2H. CO—CH₂—CO). 7.52 (br, 1H, NH) ppm.

¹H-NMR (400 MHz, CD₃CN): δ =1.78-1.82 (m, 2H), 1.90-2.06 (2m, 4H), 2.12-2.18 (m, 2H), 3.03 (s, 2H, CO—CH₂—CO), 7.27 (br, 1H, NH) ppm.

Example (X-2-a-1)

Process B

28.7 g (0.1 mol) of the compound according to Ex. XII-1 are introduced into 100 ml of absolute methanol. At 20° C., 19.5 ml of sodium methylate solution (30% strength in methanol) are added dropwise and the mixture is then stirred for 4 h at 40° C. The solvent is evaporated off in vacuo, the residue is taken up with 50 mil of water, and, at 0° C., 110 ml of 1 N hydrochloric acid are added dropwise. Upon evaporation in vacuo, the product precipitates out, is then suspended in 50 ml of ice-water and filtered off with suction.

Yield: 25 g (97% of theory) m.p, decomposition.

¹H-NMR (400 MHz, d₆-DMSO): δ =1.32-1.35 (“d”, 2H), 1.39-1.49 (m, 2H), 1.65-1.73 (tm, 2H), 1.90-194 (dm, 2H), 3.09-3.16 (zm, 1H, CHOCH₃-cis), 3.24 (s, 3H, OCH₃), 3.59 (s, 3H, COOCH₃) ppm.

HPLC retention time 0.97 (method: column 50×4.6 mm Eclipse Plus Cis; 1.8 μm, gradient 0.1% phosphoric acid/acetonitrile; flow: 2 ml/min, 55° C.)

The following compounds of the formula (X-2-a) are obtained analogously to Example (X-2-a-1) and according to the general preparation instructions:

(X-2-a)
				m.p.
				° C.;
				ana-
Ex. No.	A	B	R8	lytics *
X-2-a-2	—(CH2)2—O—(CH2)2—	CH3	324; *1
X-2-a-3		CH3	*2
X-2-a-4	—(CH2)2—CF2—(CH2)2—	CH3	*3
*1 1H-NMR (400 MHz, CD3OD): δ = 1.43-1.47 (dd, 2H), 2.05-2.13 (tm, 2H), 3.66-3.72 (td, 2H, OCH2), 3.80 (s, 3H, COOCH3), 3.96-4.00 (d, m, 2H, OCH2) ppm.
*2 1H-NMR (400 MHz, d6-DMSO): δ = 1.17-1.2 (d, 2H), 1.56-1.86 (m, 6H), 3.46 (s, 3H, CO2CH3), 3.84 (s, 4H, —O(CH2)2—O), 7.23 (br, 1H, NH) ppm.
*3 1H-NMR (600 MHz, d6-DMSO): δ = 1.52-1.54 (d, br, 2H), 1.91 (cm, br, 2H), 2.11-2.13 (2″d, br″, 4H), 3.66 (s, 3H, CO2CH3), 8.85 (br, 1H, NH) ppm.

Example XII-1

117.4 g (0.525 mol) of cis-1-amino-4-methoxycyclohexanecarboxylic acid methyl ester hydrochloride are introduced into 1000 ml of absolute tetrahydrofuran (THF), admixed with 153.3 ml (1.1 mol) of triethylamine and, at 20° C., 68.3 g (0.5 mol) of malonic acid methyl ester chloride in 30 ml of absolute THF are added dropwise. The mixture is then stirred for 4 h at 40° C., poured onto 1 l of water and extracted with methylene chloride, and the organic phase is dried and evaporated in vacuo. The residue (172 g) is purified by column chromatography over silica gel with methylene chloride/ethyl acetate 2:1 as eluent.

Yield: 85.6 g (59.6% of theory), m.p. 74° C.

¹H-NMR (400 MHz, CD₃CN): δ =1.34-1.44 (qm, 2H), 1.73-1.81 (tm, 2H), 1.85-195 (m, 2H), 2.06-2.12 (dm, 2H), 3.15-3.22 (zm, 1H, CHOCH₃-cis), 3.24 (s, 2H, CH₂COOCH₃), 3.28 (s, 3H, OCH₃), 3.60, 3.68 (2s, in each case 3H, COOCH₃), 6.88 (s, br, 1H, NH) ppm.

The following compounds of the formula (XII) are obtained analogously to Example (XII-1) and according to the general preparation instructions:

(XII)
				m.p.
				° C.;
				ana-
Ex. No.	A	B	R8	lytics *
XII-2	—(CH2)2—O—(CH2)2—	CH3	62; *1
XII-3		CH3	*2
XII-4	—(CH2)2—CF2—(CH2)2—	CH3	*3
*1 1H-NMR (400 MHz, CD3CN): δ = 1.41-1.46 (dm, 1H), 1.86-2.08 (m, 3H), 3.25 (s, 2H,
COCH2CO), 3.52-3.80 (m, 4H, OCH2), 3.64, 3.68 (2s, in each case 3 H, COOMe), 7.06 (sbr, 1H, NH) ppm.
*2 1H-NMR (400 MHz, CDCl3): δ = 1.67-1.76 (m, 4H), 2.14-2.19 (m, 4H), 3.34 (s, 2H,
CO—CH2—CO), 3.72, 3.77 (2s, in each case 3H, CO2CH3), 3.96 (s, 4H, —O (CH2)2— O), 7.67 (s, br, 1H, NH) ppm.
*3 1H-NMR (400 MHz, d6-DMSO): δ = 1.86-2.14 (m, 8H), 3.58 (s, 2H, COCH2CO2CH3), 3.60, 3.63 (2s, in each case 3H, CO2CH3), 8.57 (s, br, 1H, NH) ppm.

Example X-1-b-1

2,2-Dimethyl-5-oxo-2,5-dihydro-1H-pyrrol-3-yl acetate

At 0 to 5° C., a solution of 4.08 g of acetyl chloride in 20 of methylene chloride is added dropwise to a solution of 6.36 g of 5,5-dimethylpyrrolidine-2,4-dione and 5.57 g of triethylamine in 50 ml of methylene chloride. The mixture is then left to reach room temperature over the course of approximately one hour and then stirred for a further 24 hours. The reaction mixture is then diluted with 50 ml of methylene chloride, and extracted by shaking twice with in each case 50 ml of water, twice with in each case 25 ml of 5% strength sodium hydroxide solution and once with 50 ml of saturated aqueous NaCl solution. Drying and concentration by evaporation gives 1.58 g of the title compound in a purity according to HPLC of 97%.

LC/MS: m/e=170 (MH⁺).

¹H-NMR (400 MHz, CDCl₃): δ =1.33 (s, 6H), 2.23 (s, 3H), 5.91 (s, 1H), 7.05 (s, br, 1H) ppm.

Example X-1-c-1

2,2-Dimethyl-5-oxo-2,5-dihydro-H-pyrrol-3-yl ethylcarbonate

At 0 to 5° C., a solution of 5.82 g of chloroformic acid ethyl ester in 20 of methylene chloride is added dropwise to a solution of 6.36 g of 5,5-dimethylpyrrolidine-2,4-dione and 5.57 g of triethylamine in 50 ml of methylene chloride. The mixture is then left to reach room temperature over the course of approximately one hour and then stirred for a further 24 hours. The reaction mixture is then diluted with 50 ml of methylene chloride, and extracted by shaking twice with in each case 50 ml of water, twice with in each case 25 ml of 5% strength sodium hydroxide solution and once with 50 ml of saturated aqueous NaCl solution. Drying and concentration by evaporation gives 3.66 g of the title compound in a purity according to HPLC of 98%.

LC/MS: m/e=200 (MH⁺).

¹H-NMR (400 MHz, CDCl₃): δ =1.31-1.35 (m, 9H), 4.25-4.30 (q, 2H), 5.88 (s, 1H), 7.29 (s, br, 1H) ppm.

Example XVIII-1

5.72 g (30 mmol) of 1-amino-4-methoxycyclohexanecarbonitrile hydrochloride (cis/trans ca. 1:1) are introduced as initial charge in 60 ml of tetrahydrofuran (THF) and admixed with 8.36 ml (60 mmol) of triethylamine and 10 mg of Steglich base. At 0°-10° C., 4.1 g (30 mmol) of malonic acid methyl ester chloride in 5 ml of THF are added dropwise and the mixture is after-stirred for 4 h at room temperature, followed by filtration with suction, after-washing with THF and evaporation in vacuo. The residue is purified by flash column chromatography over silica gel with cyclohexane/ethyl acetate 2:1. This gives 4.96 g (65% of theory) of a cis/trans isomer mixture in the ratio of ca. 7:3.

¹H-NMR (400 MHz, d₆-DMSO): δ =1.41-1.47 (m, 2H), 1.68-1.74 (m, 2H), 1.91-1.99 (m, 2H), 2.21-2.25 (m, 2H), 3.21, 3.24 (2s, trans/cis, tog. 3H, OCH₃), 3.22-3.27 (m, 1H, CHOCH₃), 3.32 (s, 2CH₂CO₂CH₃), 3.63 (s, 3H, CO₂CH₃), 8.56, 8.63 (2s, br, trans/cis, tog. 1H, NH) ppm.

Example XX-1

9.53 g (50 mmol) of 1-amino-4-methoxy-cyclohexanecarbonitrile×HCl (cis/trans mixture ca. 1:1) and 4.25 g (50 mmol) of cyanoacetic acid are introduced as initial charge in 25 ml of pyridine. Then, without cooling, 5.1 g (50 mmol) of acetone hydride in 25 ml of pyridine are added dropwise and, following the addition, the mixture is worked-up immediately. The pyridine is evaporated off in vacuo, and the residue is taken up 2× with in each case 20 ml of toluene and evaporated again. Water is then added, and the mixture is extracted with methylene chloride, followed by drying and evaporation. The residue is pre-purified by flash chromatography over silica gel with ethyl acetate/methanol gradient 9:1 to 4:1. This gives 6.86 g of a wax which smells strongly of vinegar; this is recrystallized from 50 ml of ethyl acetate. Filtration with suction gives 1.61 g (14.6% of theory) of a white powder.

¹H-NMR (400 MHz, d₆-DMSO): δ =1.37-1.46 (m, 2H), 1.67-1.72 (cm, 211), 1.91-1.94 (m, 2H), 2.22-2.26 (m, 2H), 3.24 (s. 3H, OCH₃) 3.22-3.26 (m, 1H, CHOCH₃), 3.74 (s, 2H, CO—CH₂CN), 8.81 (s. br, 1H, NH) ppm.

Claims

1. A compound of formula (X):