Patent Application
20170100396
The present invention relates to a compound having the general formula (I), optionally in the form of a pharmaceutically acceptable salt, solvate, polymorph, prodrug, tautomer, racemate, codrug, cocrystal, enantiomer, or diastereomer or mixture thereof,
which is useful in treating, ameliorating or preventing influenza. Furthermore, specific combination therapies are disclosed.
In recent years the serious threat posed by influenza virus to worldwide public health has been highlighted by, firstly, the ongoing low level transmission to humans of the highly pathogenic avian H5N1 strain (63% mortality in infected humans, http://www.who.int/csr/disease/avian_influenza/en/) and secondly, the unexpected emergence in 2009 of a novel pandemic strain A/H1N1 that has rapidly spread around the entire world (http://www.who.int/csr/disease/swineflu/en/). Whilst the new strain is highly contagious but currently generally only gives mild illness, the future evolution of this virus is unpredictable. In a much more serious, but highly plausible scenario, H5N1 could have been more easily transmissible between humans or the new A/H1N1 could have been more virulent and could have carried the single point mutation that confers Tamiflu resistance (Neumann et al., Nature, 2009 (18; 459(7249) 931-939), as many seasonal H1N1 strains have recently done (Dharan et al., The Journal of the American Medical Association, 2009 Mar. 11; 301 (10), 1034-1041; Moscona et al., The New England Journal of Medicine, 2009 (March 5; 360(10) pp 953-956). In this case, the delay in generating and deploying a vaccine (˜6 months in the relatively favorable case of A/H1N1 and still not a solved problem for H5N1) could have been catastrophically costly in human lives and societal disruption.
It is widely acknowledged that to bridge the period before a new vaccine becomes available and to treat severe cases, as well as to counter the problem of viral resistance, a wider choice of anti-influenza drugs is required. Development of new anti-influenza drugs has therefore again become a high priority, having been largely abandoned by the major pharmaceutical companies once the anti-neuraminidase drugs became available.
An excellent starting point for the development of antiviral medication is structural data of essential viral proteins. Thus, the crystal structure determination of e.g. the influenza virus surface antigen neuraminidase (Von Itzstein, M. et al., (1993), Nature, 363, pp. 418-423) led directly to the development of neuraminidase inhibitors with anti-viral activity preventing the release of virus from the cells, however, not the virus production. These and their derivatives have subsequently developed into the anti-influenza drugs, zanamivir (Glaxo) and oseltamivir (Roche), which are currently being stockpiled by many countries as a first line of defence against an eventual pandemic. However, these medicaments only provide a reduction in the duration of the clinical disease. Alternatively, other anti-influenza compounds such as amantadine and rimantadine target an ion channel protein, i.e., the M2 protein, in the viral membrane interfering with the uncoating of the virus inside the cell. However, they have not been extensively used due to their side effects and the rapid development of resistant virus mutants (Magden, J. et al., (2005), Appl. Microbiol. Biotechnol., 66, pp. 612-621). In addition, more unspecific viral drugs, such as ribavirin, have been shown to work for treating of influenza and other virus infections (Eriksson, B. et al., (1977), Antimicrob. Agents Chemother., 11, pp. 946-951). However, ribavirin is only approved in a few countries (Furuta et al., Antimicrobial Agents and Chemotherapy, 2005 March 49(3); 981-986), probably due to severe side effects. Clearly, new antiviral compounds are needed, preferably directed against different targets.
Influenza viruses are negative stranded RNA viruses. Their genome is segmented and comes in ribonucleoprotein particles that include the RNA dependent RNA polymerase which carries out (i) the initial copying of the single-stranded virion RNA (vRNA) into viral mRNAs and (ii) the vRNA replication. This enzyme, a trimeric complex composed of subunits PA, PB1 and PB2, is central to the life cycle of the virus since it is responsible for the replication and transcription of viral RNA. In previous work the atomic structure of two key domains of the polymerase, the mRNA cap-binding domain in the PB2 subunit (Guilligay et al., Antimicrobial Agents and Chemotherapy, 2005 March 49(3); pp 981-986) and the endonuclease-active site in the PA subunit (Dias et al., Nature 2009; April 16; 458(7240); 914-918) have been identified and determined. These two sites are critical for the unique cap-snatching mode of transcription that is used by influenza virus to generate viral mRNAs. For the generation of viral mRNA the polymerase makes use of the so called “cap-snatching” mechanism (Plotch, S. J. et al., (1981), Cell, 23, pp. 847-858; Kukkonen, S. K. et al (2005), Arch. Virol., 150, pp. 533-556; Leahy, M. B. et al, (2005), J. Virol., 71, pp. 8347-8351; Noah, D. L. et al., (2005), Adv. Virus Res., 65, pp. 121-145). A 5′ cap (also termed an RNA cap, RNA 7-methylguanosine cap or an RNA m7G cap) is a modified guanine nucleotide that has been added to the 5′ end of each cellular messenger RNA. The 5′RNA cap consists of a terminal 7-methylguanosine residue which is linked through a 5′-5′-triphosphate bond to the first transcribed nucleotide. Upon influenza virus infection the 5′RNA cap of cellular mRNA molecules is bound by the viral polymerase complex, specifically the cap-binding domain within the PB2 subunit of the polymerase complex, and the RNA cap together with a stretch of 10 to 15 nucleotides is cleaved by the viral endonuclease which resides within the PA subunit of the viral polymerase complex. The capped RNA fragments then serve as primers for the synthesis of viral mRNA.
The cap-binding domain in the PB2 subunit of the viral polymerase has been unequivocally identified and structurally characterized by Guilligay et al., 2008. Binding the capped host cell mRNA via the cap-binding site and hence bringing the host cell mRNA strand into close spatial vicinity of the endonuclease active site is a prerequisite for the endonuclease to snatch off the cap. Therefore the cap-binding site in PB2 is essential for cap-dependent transcription by the viral RNPs and mandatory for the viral replication cycle. This together with the fact that the PB2 cap-binding domain is structurally distinct from other cap binding proteins, this suggests that the ligand binding site is a good target for the development of new antiviral drugs.
Generally, the polymerase complex seems to be an appropriate antiviral drug target since it is essential for synthesis of viral mRNA and viral replication and contains several functional active sites likely to be significantly different from those found in host cell proteins (Magden, J. et al., (2005), Appl. Microbiol. Biotechnol., 66, pp. 612-621). Thus, for example, there have been attempts to interfere with the assembly of polymerase subunits by a 25-amino-acid peptide resembling the PA-binding domain within PB1 (Ghanem, A. et al., (2007), J. Virol., 81, pp. 7801-7804). Furthermore, the endonuclease activity of the polymerase has been targeted and a series of 4-substituted 2,4-dioxobutanoic acid compounds has been identified as selective inhibitors of this activity in influenza viruses (Tomassini, J. et al., (1994), Antimicrob. Agents Chemother., 38, pp. 2827-2837). In addition, flutimide, a substituted 2,6-diketopiperazine, identified in extracts of Delitschia confertaspora, a fungal species, has been shown to inhibit the endonuclease of influenza virus (Tomassini, J. et al., (1996), Antimicrob. Agents Chemother., 40, pp. 1189-1193). Moreover, there have been attempts to interfere with viral transcription by nucleoside analogs, such as 2′-deoxy-2′-fluoroguanosine (Tisdale, M. et al., (1995), Antimicrob. Agents Chemother., 39, pp. 2454-2458).
WO 2009/106441, WO2009/106442, WO 2009/106443; WO 2009/106444; WO 2009/106445; WO 2011/117145, WO 2011/117160, WO 2011/144584, and WO 2011/144585 disclose certain pyrrolopyrazine derivatives.
It is an object of the present invention to identify compounds which specifically target the influenza virus cap-binding domain and hence are effective against influenza and which have improved pharmacological properties.
Accordingly, in a first embodiment, the present invention provides a compound having the general formula (I) for use in the treatment, amelioration or prevention of influenza.
It is understood that throughout the present specification the term “a compound having the general formula (I)” encompasses pharmaceutically acceptable salts, solvates, polymorphs, prodrugs, tautomers, racemates, codrug, cocrystal, enantiomers, or diastereomers or mixtures thereof unless mentioned otherwise.
Before the present invention is described in detail below, it is to be understood that this invention is not limited to the particular methodology, protocols and reagents described herein as these may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention which will be limited only by the appended claims. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art.
Preferably, the terms used herein are defined as described in “A multilingual glossary of biotechnological terms: (IUPAC Recommendations)”, Leuenberger, H. G. W, Nagel, B. and Kölbl, H. eds. (1995), Helvetica Chimica Acta, CH-4010 Basel, Switzerland).
Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, and variations such as “comprises” and “comprising”, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. In the following passages different aspects of the invention are defined in more detail. Each aspect so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.
Several documents are cited throughout the text of this specification. Each of the documents cited herein (including all patents, patent applications, scientific publications, manufacturer's specifications, instructions, etc.), whether supra or infra, are hereby incorporated by reference in their entirety. Nothing herein is to be construed as an admission that the invention is not entitled to antedate such disclosure by virtue of prior invention.
The phrase “a” or “an” entity as used herein refers to one or more of that entity; for example, a compound refers to one or more compounds or at least one compound. As such, the terms “a” (or “an”), “one or more”, and “at least one” can be used interchangeably herein.
The phrase “as defined herein” refers to the broadest definition for each group as provided in the Summary of the Invention or the broadest claim. In all other embodiments provided below, substituents which can be present in each embodiment and which are not explicitly defined retain the broadest definition provided in the Summary of the Invention.
As used in this specification, whether in a transitional phrase or in the body of the claim, the terms “comprise(s)” and “comprising” are to be interpreted as having an open-ended meaning. That is, the terms are to be interpreted synonymously with the phrases “having at least” or “including at least”. When used in the context of a process, the term “comprising” means that the process includes at least the recited steps, but may include additional steps.
When used in the context of a compound or composition, the term “comprising” means that the compound or composition includes at least the recited features or components, but may also include additional features or components.
As used herein, unless specifically indicated otherwise, the word “or” is used in the “inclusive” sense of “and/or” and not the “exclusive” sense of “either/or”.
The term “independently” is used herein to indicate that a variable is applied in any one instance without regard to the presence or absence of a variable having that same or a different definition within the same compound. Thus, in a compound in which R″ appears twice and is defined as “independently carbon or nitrogen”, both R″s can be carbon, both R″s can be nitrogen, or one R″ can be carbon and the other nitrogen.
When any variable occurs more than one time in any moiety or formula depicting and describing compounds employed or claimed in the present invention, its definition on each occurrence is independent of its definition at every other occurrence. Also, combinations of substituents and/or variables are permissible only if such compounds result in stable compounds.
The symbol “” at the end of a bond refers to the point of attachment of a functional group or other chemical moiety to the rest of the molecule of which it is a part.
A bond drawn into ring system (as opposed to connected at a distinct vertex) indicates that the bond may be attached to any of the suitable ring atoms.
The term “optional” or “optionally” as used herein means that a subsequently described event or circumstance may, but need not, occur, and that the description includes instances where the event or circumstance occurs and instances in which it does not. For example, “optionally substituted” means that the optionally substituted moiety may incorporate a hydrogen or a substituent.
The phrase “come together to form a ring” as used herein means join to form a ring, wherein the ring may be made up of either 4-7 carbon atoms or 4-7 carbon and heteroatoms, and may be saturated or unsaturated.
The phrase “come together to form a bicyclic ring system” as used herein means join to form a bicyclic ring system, wherein each ring may be made up of either 4-7 carbon atoms or 4-7 carbon and heteroatoms, and may be saturated or unsaturated.
The term “about” is used herein to mean approximately, in the region of, roughly, or around. When the term “about” is used in conjunction with a numerical range, it modifies that range by extending the boundaries herein and below the numerical values set forth. In general, the term “about” is used herein to modify a numerical value herein above and below the stated value by a variance of 20%.
The definitions described herein may be appended to form chemically-relevant combinations, such as “heteroalkylaryl,” “haloalkylheteroaryl,” “arylalkylheterocyclyl,” “alkylcarbonyl,” “alkoxyalkyl,” “cycloalkylalkyl” and the like. When the term “alkyl” is used as a suffix following another term, as in “phenylalkyl,” or “hydroxyalkyl,” this is intended to refer to an alkyl group, as defined herein, being substituted with one to two substituents selected from the other specifically-named group. Thus, for example, “phenylalkyl” refers to an alkyl group having one to two phenyl substituents, and thus includes benzyl, phenylethyl, and biphenyl. An “alkylaminoalkyl” is an alkyl group having one to two alkylamino substituents. “Hydroxyalkyl” includes 2-hydroxyethyl, 2-hydroxypropyl, I-(hydroxymethyl)-2-methylpropyl, 2-hydroxybutyl, 2,3-dihydroxybutyl, 2-(hydroxymethyl), 3-hydroxypropyl, and so forth. Accordingly, as used herein, the term “hydroxyalkyl” is used to define a subset of heteroalkyl groups defined below. The term -(ar)alkyl refers to either an unsubstituted alkyl or an aralkyl group. The term (hetero)aryl or (het)aryl refers to either an aryl or a heteroaryl group.
Compounds having the formula (I) may exhibit tautomerism. Tautomeric compounds can exist as two or more interconvertable species. Prototropic tautomers result from the migration of a covalently bonded hydrogen atom between two atoms. Tautomers generally exist in equilibrium and attempts to isolate an individual tautomers usually produce a mixture whose chemical and physical properties are consistent with a mixture of compounds. The position of the equilibrium is dependent on chemical features within the molecule. For example, in many aliphatic aldehydes and ketones, such as acetaldehyde, the keto form predominates while; in phenols, the enol form predominates. Common prototropic tautomers include keto/enol (—C(═O)—CH——C(—OH)═CH—), amide/imidic acid (—C(═O)—NH—
—C(—OH)═N—) and amidine (—C(═NR)—NH—
—C(—NHR)═N—) tautomers. The latter two are particularly common in heteroaryl and heterocyclic rings and the present invention encompasses all tautomeric forms of the compounds.
Technical and scientific terms used herein have the meaning commonly understood by one of skill in the art to which the present invention pertains, unless otherwise defined. Reference is made herein to various methodologies and materials known to those of skill in the art. Standard reference works setting forth the general principles of pharmacology include Goodman and Gilman's The Pharmacological Basis of Therapeutics, 10th Ed., McGraw Hill Companies Inc., New York (2001). Any suitable materials and/or methods known to those of skill can be utilized in carrying out the present invention. However, preferred materials and methods are described. Materials, reagents and the like to which reference are made in the following description and examples are obtainable from commercial sources, unless otherwise noted.
As used herein, the term “organic substituent” comprises any substituent comprising carbon and in addition also comprises hydrogen and halogens.
The term “acyl” as used herein denotes a group of formula —C(═O)R wherein R is hydrogen or lower alkyl as defined herein.
The term or “alkylcarbonyl” as used herein denotes a group of formula —C(═O)R wherein R is alkyl as defined herein. The term C1-6 acyl refers to a group —C(═O)R contain 6 carbon atoms. The term “arylcarbonyl” as used herein means a group of formula —C(═O)R wherein R is an aryl group; the term “benzoyl” as used herein an “arylcarbonyl” group wherein R is phenyl.
The term “alkyl” as used herein denotes an unbranched or branched chain, saturated, monovalent hydrocarbon residue containing 1 to 10 carbon atoms. The term “lower alkyl” denotes a straight or branched chain hydrocarbon residue containing 1 to 6 carbon atoms. “C1-10 alkyl” as used herein refers to an alkyl composed of 1 to 10 carbons. Examples of alkyl groups include, but are not limited to, lower alkyl groups include methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl, t-butyl or pentyl, isopentyl, neopentyl, hexyl, heptyl, and octyl.
The term “alkenyl” as used herein denotes an unbranched or branched chain, monovalent hydrocarbon residue containing 2 to 10 carbon atoms which includes at least one double bond. The term “lower alkenyl” denotes a straight or branched chain hydrocarbon residue containing 2 to 6 carbon atoms which includes at least one double bond. “C2-10 alkenyl” as used herein refers to an alkenyl composed of 2 to 10 carbons.
The term “alkynyl” as used herein denotes an unbranched or branched chain, monovalent hydrocarbon residue containing 2 to 10 carbon atoms which includes at least one triple bond. The term “lower alkynyl” denotes a straight or branched chain hydrocarbon residue containing 2 to 6 carbon atoms which includes at least one triple bond. “C2-10 alkenyl” as used herein refers to an alkenyl composed of 2 to 10 carbons.
When the term “alkyl” is used as a suffix following another term, as in “phenylalkyl” or “hydroxyalkyl”, this is intended to refer to an alkyl group, as defined herein, being substituted with one to two substituents selected from the other specifically-named group. Thus, for example, “phenylalkyl” denotes the radical R′R″—, wherein R′ is a phenyl radical, and R″ is an alkylene radical as defined herein with the understanding that the attachment point of the phenylalkyl moiety will be on the alkylene radical. Examples of arylalkyl radicals include, but are not limited to, benzyl, phenylethyl, 3-phenylpropyl. The terms “arylalkyl”, “aryl alkyl”, or “aralkyl” are interpreted similarly except R′ is an aryl radical. The terms “heteroaryl alkyl” or “heteroarylalkyl” are interpreted similarly except R′ is optionally an aryl or a heteroaryl radical.
The term “haloalkyl” as used herein denotes a unbranched or branched chain alkyl group as defined herein wherein 1, 2, 3 or more hydrogen atoms are substituted by a halogen. The term “lower haloalkyl” denotes a straight or branched chain hydrocarbon residue containing 1 to 6 carbon atoms, wherein 1, 2, 3 or more hydrogen atoms are substituted by a halogen. Examples are 1-fluoromethyl, 1-chloromethyl, 1-bromomethyl, 1-iodomethyl, difluoromethyl, trifluoromethyl, trichloromethyl, tribromomethyl, triiodomethyl, 1-fluoroethyl, 1-chloroethyl, 1-bromoethyl, 1-iodoethyl, 2-fluoroethyl, 2-chloroethyl, 2-bromoethyl, 2-iodoethyl, 2,2-dichloroethyl, 3-bromopropyl or 2,2,2-trifluoroethyl.
The term “alkylene” as used herein denotes a divalent saturated linear hydrocarbon radical of 1 to 10 carbon atoms (e.g., (CH2)n) or a branched saturated divalent hydrocarbon radical of 2 to 10 carbon atoms (e.g., —CHMe- or —CH2CH(i-Pr)CH2—), unless otherwise indicated. Except in the case of methylene, the open valences of an alkylene group are not attached to the same atom. Examples of alkylene radicals include, but are not limited to, methylene, ethylene, propylene, 2-methyl-propylene, 1,1-dimethyl-ethylene, butylene, and 2-ethylbutylene.
The term “alkoxy” as used herein means an —O-alkyl group, wherein alkyl is as defined herein such as methoxy, ethoxy, n-propyloxy, i-propyloxy, n-butyloxy, i-butyloxy, t-butyloxy, pentyloxy, hexyloxy, including their isomers. “Lower alkoxy” as used herein denotes an alkoxy group with a “lower alkyl” group as previously defined. “C1-10 alkoxy” as used herein refers to an —O-alkyl wherein alkyl is C1-10.
The term “alkoxyalkyl” as used herein refers to the radical R′R″-, wherein R′ is an alkoxy radical as defined herein, and R″ is an alkylene radical as defined herein with the understanding that the attachment point of the alkoxyalkyl moiety will be on the alkylene radical. C1-6 alkoxyalkyl denotes a group wherein the alkyl portion is comprised of 1-6 carbon atoms exclusive of carbon atoms in the alkoxy portion of the group. C1-3 alkoxy-C1-6 alkyl denotes a group wherein the alkyl portion is comprised of 1-6 carbon atoms and the alkoxy group is 1-3 carbons. Examples are methoxymethyl, methoxyethyl, methoxypropyl, ethoxymethyl, ethoxyethyl, ethoxypropyl, propyloxypropyl, methoxybutyl, ethoxybutyl, propyloxybutyl, butyloxybutyl, t-butyloxybutyl, methoxypentyl, ethoxypentyl, propyloxypentyl including their isomers.
The term “hydroxyalkyl” as used herein denotes an alkyl radical as herein defined wherein one to three hydrogen atoms on different carbon atoms is/are replaced by hydroxyl groups.
The term “cycloalkyl” as used herein refers to a saturated carbocyclic ring containing 3 to 8 carbon atoms, i.e. cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl. “C3-7 cycloalkyl” as used herein refers to an cycloalkyl composed of 3 to 7 carbons in the carbocyclic ring.
The term “cycloalkenyl” refers to a partially unsaturated carbocyclic containing 5 to 7 carbon atoms unless otherwise specified and having a carbon-carbon double bond within the ring. For example, C5-6 cycloalkenyl refers to a cycloalkenyl group having from 5 to 6 member atoms. In certain embodiments cycloalkenyl groups have one carbon-carbon double bond within the ring. In other embodiments, cycloalkenyl groups have more than one carbon-carbon double bond within the ring. However, cycloalkenyl rings are not aromatic. Cycloalkenyl groups may be optionally substituted with one or more substituent. Examples of cycloalkenyl include, but are not limited to, cyclopentenyl and cyclohexenyl.
The term “halogen” or “halo” as used herein means fluorine, chlorine, bromine, or iodine.
The term “amino” as used herein encompasses —NR2, wherein each R group is independently H or lower alkyl, wherein lower alkyl is as defined herein. Examples of amino groups include dimethyl amino, methyl amino and NH2.
As used herein, the term “aryl” means a monocyclic or bicyclic (also referred to as “biaryl”), substituted or unsubstituted carbocyclic aromatic group. Examples of aryl groups are phenyl, naphthyl and the like.
The term “heteroaryl” or “heteroaromatic” as used herein means a monocyclic, bicyclic, or tricyclic radical of 5 to 18 ring atoms having at least one aromatic ring containing four to eight atoms per ring, incorporating one or more N, O, or S heteroatoms, the remaining ring atoms being carbon, with the understanding that the attachment point of the heteroaryl radical will be on an aromatic ring. As well known to those skilled in the art, heteroaryl rings have less aromatic character than their all-carbon counter parts. Thus, for the purposes of the invention, a heteroaryl group need only have some degree of aromatic character. Examples of heteroaryl moieties include monocyclic aromatic heterocycles having 5 to 6 ring atoms and 1 to 3 heteroatoms include, but is not limited to, pyridinyl, pyrimidinyl, pyrazinyl, pyrrolyl, pyrazolyl, imidazolyl, oxazol, isoxazole, thiazole, isothiazole, triazoline, thiadiazole and oxadiaxoline which can optionally be substituted with one or more, preferably one or two substituents selected from hydroxy, cyano, alkyl, alkoxy, thio, lower haloalkoxy, alkylthio, halo, haloalkyl, alkylsulfinyl, alkylsulfonyl, halogen, amino, alkylamino, dialkylamino, aminoalkyl, alkylaminoalkyl, and dialkylaminoalkyl, nitro, alkoxycarbonyl and carbamoyl, alkylcarbamoyl, dialkylcarbamoyl, arylcarbamoyl, alkylcarbonylamino and arylcarbonylamino. Examples of bicyclic moieties include, but are not limited to, quinolinyl, isoquinolinyl, benzofuryl, benzothiophenyl, benzoxazole, benzisoxazole, benzothiazole and benzisothiazole.
The term “heteroaryloxy” as used herein means an —O-(heteroaryl) group wherein heteroaryl is defined herein.
The term (hetero)aryl as used herein refers to an aryl or a heteroaryl moiety as each is defined herein.
The term “heterocycloalkyl”, “heterocyclyl” or “heterocycle” as used herein denotes a monovalent saturated cyclic radical, consisting of one or more rings, preferably one to two rings or three rings, of three to eight atoms per ring, incorporating one or more ring carbon atoms and one or more ring heteroatoms (chosen from N, O or S(═O)0-2), wherein the point of attachment can be through either a carbon atom or a heteroatom, and which can optionally be independently substituted with one or more, preferably one or two or three substituents selected from hydroxy, oxo, cyano, lower alkyl, lower alkoxy, lower haloalkoxy, alkylthio, halo, haloalkyl, hydroxyalkyl, nitro, alkoxycarbonyl, amino, alkylamino, alkylsulfonyl, arylsulfonyl, alkylaminosulfonyl, arylaminosulfonyl, alkylsulfonylamino, arylsulfonylamino, alkylaminocarbonyl, arylaminocarbonyl, alkylcarbonylamino, arylcarbonylamino, unless otherwise indicated. Examples of heterocyclic radicals include, but are not limited to, azetidinyl, pyrrolidinyl, hexahydroazepinyl, oxetanyl, tetrahydrofuranyl, tetrahydrothiophenyl, oxazolidinyl, thiazolidinyl, isoxazolidinyl, morpholinyl, piperazinyl, piperidinyl, tetrahydropyranyl, thiomorpholinyl, quinuclidinyl and imidazolinyl.
The term “heterocycloalkyloxy” as used herein means an —O-(heterocycloalkyl) group wherein heterocycloalkyl is defined herein.
The term “heteroatom containing moieties” as used herein means moieties which contain heteroatoms such as N, O or S. The heteroatom containing moieties include —C(O)—, —C(O)—NH—, —C(O)—O— and the like.
If a compound or moiety is referred to as being “optionally substituted” it can in each instance include 1 or more of the indicated substituents, whereby the substituents can be the same or different.
The term “excipient” as used herein refers to a compound that is useful in preparing a pharmaceutical composition, generally safe, non-toxic and neither biologically nor otherwise undesirable, and includes excipients that are acceptable for veterinary use as well as human pharmaceutical use. The compounds of this invention can be administered alone but will generally be administered in admixture with one or more suitable pharmaceutical excipients, diluents or carriers selected with regard to the intended route of administration and standard pharmaceutical practice.
“Pharmaceutically acceptable” means that which is useful in preparing a pharmaceutical composition that is generally safe, non-toxic, and neither biologically nor otherwise undesirable and includes that which is acceptable for veterinary as well as human pharmaceutical use. A “pharmaceutically acceptable salt” form of an active ingredient may also initially confer a desirable pharmacokinetic property on the active ingredient which were absent in the non-salt form, and may even positively affect the pharmacodynamics of the active ingredient with respect to its therapeutic activity in the body. The phrase “pharmaceutically acceptable salt” of a compound means a salt that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound. Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3-(4-hydroxybenzoyl)benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethane-disulfonic acid, 2-hydroxyethanesulfonic acid, benzenesulfonic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylic acid, glucoheptonic acid, 3-phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, lauryl sulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid, and the like; or (2) salts formed when an acidic proton present in the parent compound either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, tromethamine, N-methylglucamine, and the like.
Suitable pharmaceutically acceptable salts include acid addition salts which may, for example, be formed by mixing a solution of compounds of the present invention with a solution of a pharmaceutically acceptable acid such as hydrochloric acid, sulfuric acid, fumaric acid, maleic acid, succinic acid, acetic acid, benzoic acid, citric acid, tartaric acid, carbonic acid or phosphoric acid. Furthermore, where the compound carries an acidic moiety, suitable pharmaceutically acceptable salts thereof may include alkali metal salts (e.g., sodium or potassium salts); alkaline earth metal salts (e.g., calcium or magnesium salts); and salts formed with suitable organic ligands (e.g., ammonium, quaternary ammonium and amine cations formed using counteranions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, alkyl sulfonate and aryl sulfonate). Illustrative examples of pharmaceutically acceptable salts include, but are not limited to, acetate, adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bicarbonate, bisulfate, bitartrate, borate, bromide, butyrate, calcium edetate, camphorate, camphorsulfonate, camsylate, carbonate, chloride, citrate, clavulanate, cyclopentanepropionate, digluconate, dihydrochloride, dodecylsulfate, edetate, edisylate, estolate, esylate, ethanesulfonate, formate, fumarate, gluceptate, glucoheptonate, gluconate, glutamate, glycerophosphate, glycolylarsanilate, hemisulfate, heptanoate, hexanoate, hexylresorcinate, hydrabamine, hydrobromide, hydrochloride, hydroiodide, 2-hydroxy-ethanesulfonate, hydroxynaphthoate, iodide, isothionate, lactate, lactobionate, laurate, lauryl sulfate, malate, maleate, malonate, mandelate, mesylate, methanesulfonate, methylsulfate, mucate, 2-naphthalenesulfonate, napsylate, nicotinate, nitrate, N-methylglucamine ammonium salt, oleate, oxalate, pamoate (embonate), palmitate, pantothenate, pectinate, persulfate, 3-phenylpropionate, phosphate/diphosphate, picrate, pivalate, polygalacturonate, propionate, salicylate, stearate, sulfate, subacetate, succinate, tannate, tartrate, teoclate, tosylate, triethiodide, undecanoate, valerate, and the like (see, for example, S. M. Berge et al., “Pharmaceutical Salts”, J. Pharm. Sci., 66, pp. 1-19 (1977)).
When the compounds of the present invention are provided in crystalline form, the structure can contain solvent molecules. The solvents are typically pharmaceutically acceptable solvents and include, among others, water (hydrates) or organic solvents. Examples of possible solvates include ethanolates and iso-propanolates.
The term “codrug” refers to two or more therapeutic compounds bonded via a covalent chemical bond. A detailed definition can be found, e.g., in N. Das et al., European Journal of Pharmaceutical Sciences, 41, 2010, 571-588.
The term “cocrystal” refers to a multiple component crystal in which all components are solid under ambient conditions when in their pure form. These components co-exist as a stoichiometric or non-stoichometric ratio of a target molecule or ion (i.e., compound of the present invention) and one or more neutral molecular cocrystal formers. A detailed discussion can be found, for example, in Ning Shan et al., Drug Discovery Today, 13(9/10), 2008, 440-446 and in D. J. Good et al., Cryst. Growth Des., 9(5), 2009, 2252-2264.
The compounds of the present invention can also be provided in the form of a prodrug, namely a compound which is metabolized in vivo to the active metabolite.
The compounds useful in the present invention have the general formula (I):
These compounds are known from WO 2009/106441, WO2009/106442, WO 2009/106444; WO 2011/117145, WO 2011/117160, WO 2011/144584, and WO 2011/144585. These references, in particular, the description of the compounds having the general formula (I), the definitions of the moieties Q, R1 and R2 (including the preferred definitions thereof), the exemplified compounds as well as the methods for the preparation of the compounds, are incorporated herein in their entirety by reference.
In the above general formula (I)
Q is an organic substituent;
R1 is an organic substituent; and
R2 is an organic substituent.
In a preferred embodiment, Q is Q1, Q2, or Q3; more preferably Q is Q1.
In a preferred embodiment, Q1 is cycloalkyl, heterocycloalkyl, cycloalkyloxy, cycloalkenyl, heterocycloalkyl aryl, aryloxy, heteroaryl, biaryl, or heterobiaryl, optionally substituted with one or more Q1a;
Q1a is Q1b Or Q1c;
each Q1b is independently halogen, oxo, hydroxy, cyano, —SCH3, —S(O)2CH3, or —S(═O)CH3;
each Q1c is independently Q1d or Q1e;
or two Q1a come together to form a bicyclic ring system, optionally substituted with one or more Q1b or Q1c;
each Q1d is independently —O(Q1e), —S(═O)2(Q1e), —C(═O)N(Q1e)2, —S(O)2(Q1e), —C(═O)(Q1e), —C(═O)O(Q1e), —N(Q1e)2, —N(Q1e)C(═O)(Q1e), —N(Q1e)C(═O)O(Q1e), or —N(Q1e)C(═O)N(Q1e)2;
each Q1e is independently H or Q1j;
each Q1f is independently Q1g or Q1h;
each Q1g is independently halogen, hydroxy, cyano, oxo, —C(═O)(Q1h), —S(═O)2(Q1k), —S(═O)2N(Q1k)2, —C(═O)OH, C(═O)N(Q1k)2, or —C(═O)(Q1k);
each Q1h is independently lower alkyl, lower alkenyl, lower haloalkyl, lower alkoxy, amino, aryl, benzyl, cycloalkyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more Q1i;
each Q1l is independently halogen, hydroxy, cyano, lower alkyl, lower haloalkyl, or lower alkoxy;
each Q1j is independently lower alkyl, aryl, benzyl, 5,6,7,8-tetrahydro-naphthalene, lower haloalkyl, lower alkoxy, cycloalkyl, cycloalkyl lower alkyl, cycloalkenyl, heterocycloalkyl, spirocyclic heterocycloalkyl, or heteroaryl, optionally substituted with one or more Q1f;
each Q1k is independently H or lower alkyl.
In a preferred embodiment, Q2 is Q2a or Q2b;
Q2a is H, hydroxy, halogen, or cyano;
Q2b is lower alkyl, lower alkoxy, lower alkenyl, lower alkynyl, lower hydroxyalkyl, amino, or lower haloalkyl, optionally substituted with one or more Q2c;
Q2c is Q2d or Q2e;
Q2d is halogen, oxo, hydroxy, cyano, —C(═O)(Q2j), —SCH3, —S(O)2CH3, or —S(═O)CH3;
Q2e is Q2f Or Q2j;
or two Q2c come together to form a bicyclic ring system, optionally substituted with one or more Q2d or Q2e;
Q2f is —O(Q2g), —S(═O)2(Q2g), —C(═O)N(Q2g)2, —S(O)2(Q2g), —C(═O)(Q2g), —C(═O)O(Q2g), —N(Q2g)2; —N(Q2g)C(═O)(Q2g)-N(Q2g)C(═O)O(Q2g), or —N(Q2g)C(═O)N(Q2g)2;
each Q2g is independently H or Q2m;
Q2h is Q2i or Q2j;
Q2i is halogen, hydroxy, cyano, oxo, or —C(═O)(Q2);
Q2j is lower alkyl, lower alkenyl, lower alkoxy, amino, aryl, benzyl, cycloalkyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more Q2k;
Q2k is halogen, hydroxy, cyano, lower alkyl, lower haloalkyl, lower alkenyl, oxo, lower hydroxyalkyl, amino or lower alkoxy;
each Q2m is independently lower alkyl, aryl, benzyl, lower haloalkyl, lower alkoxy, amino, cycloalkyl, cycloalkyl lower alkyl, cycloalkenyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more Q2h.
In a preferred embodiment, Q3 is aryl or heteroaryl, optionally substituted with one or more Q3a;
each Q3a is independently Q3b or Q3c;
each Q3b is independently halogen, hydroxy, cyano, —S(Q3e), —S(O)2(Q3e), or —S(═O)(Q3e);
each Q3c is independently Q3d or Q3e;
each Q3d is independently —O(Q3e), —S(═O)2(Q3e), —C(═O)N(Q3e)2, —S(═O)(Q3e), —N(Q3e)S(═O)2(Q3e), —C(═O)(Q3e), —C(═O)O(Q3e), —N(Q3e)2, —N(Q3e)C(═O)(Q3e), —N(Q3e)C(═O)O(Q3e), —Si(Q3e)3, or —N(Q3e)C(═O)N(Q3e)2;
each Q3e is independently H or Q3m;
each Q3f is independently Q3g or Q3h;
each Q3g is independently halogen, hydroxy, oxo, —(C(Q3h)2)mQS(O)2(Q3h), —(C(Q3h)2)mQN(Q3h)(C(Q3h)2)mQS(O)2(Q3h), —(C(Q3h)2)mQN(Q3h)2, —(C(Q3h)2)mQC(═O)(Q3h), or —N(Q3h)C(═O)(Q3h);
each Q3h is independently Q3i Or Q3j;
each Q3i is independently H or hydroxy;
each Q3j is independently lower alkyl, lower haloalkyl, lower alkoxy, lower thioalkyl, cyano, amino, aryl, benzyl, cycloalkyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more Q3k;
each Q3k is independently halogen, hydroxy, lower alkyl, lower haloalkyl, lower hydroxyalkyl, amino, lower thioalkyl, lower alkoxy, or cyano;
each Q3m is independently lower alkyl, amino, lower alkenyl, aryl, benzyl, lower haloalkyl, lower thioalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkyl alkylene, or heteroaryl, optionally substituted with one or more Q3f.
In a preferred embodiment, Q is selected from the group consisting of cycloalkyl, halogen, lower alkyl and aryl which is optionally substituted with one or more Q3a, wherein Q3a is selected from the group consisting of halogen, haloalkyl, cycloalkyl-C(O)—OH and cycloalkyl-C(O)—O-(lower alkyl).
In a preferred embodiment, Q is selected from the group consisting of cycloalkyl and aryl which is optionally substituted with cycloalkyl-C(O)—OH or cycloalkyl-C(O)—O-(lower alkyl).
In a more preferred embodiment, Q is cyclopropyl.
Each mQ is preferably independently 0, 1, or 2.
Preferably R1 and R2 are selected from (i) to (v). In one embodiment, R1 and R2 are as defined in embodiment (i). In one embodiment, R1 and R2 are as defined in embodiment (ii). In one embodiment, R1 and R2 are as defined in embodiment (iii). In one embodiment, R1 and R2 are as defined in embodiment (iv). In one embodiment, R1 and R2 are as defined in embodiment (v).
In embodiment (i), R1 is H and
R2 is —Y—C(O)—NR1eR1g;
Y is C(R1a)2(C(R1b)2)mR;
mR is 0 or 1;
each R1a is H or R1c;
each R1b is independently H, lower alkyl, lower haloalkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, wherein the aryl, heteroaryl, cycloalkyl, heterocycloalkyl can be optionally substituted by H, halogen, lower alkyl, lower alkoxy, or lower haloalkyl;
each R1c is independently lower alkyl, lower alkoxy, aryl, benzyl, heteroaryl, cycloalkyl, heterocycloalkyl, or cycloalkyl lower alkyl, optionally substituted with one or more R1d;
R1d is independently R1j or R1k;
R1e is independently H or R1f;
R1f is independently lower alkyl, lower alkoxy, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, bicyclic ring system or spirocyclic ring system, wherein the bicyclic ring system or spirocyclic ring system can optionally include one or more heteroatoms or heteroatom containing moieties such as C═O, wherein R1f can be optionally substituted with one or more R1d;
or R1f and R1c come together to form a ring, optionally substituted with one or more one or more halogen, lower alkyl, cyano, cyano lower alkyl, hydroxy, lower haloalkyl, lower hydroxyalkyl, lower alkoxy, lower alkylamino, or lower dialkylamino;
R1g is independently H or R1h;
R1h is independently lower alkyl, lower haloalkyl, lower alkoxy, lower hydroxyalkyl, cyano lower alkyl, C(═O)R1i or S(═O)2R1i;
each R1i is independently H or lower alkyl;
R1j is independently halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, lower hydroxyalkyl, oxo, hydroxy, C(═O)—NH—(CH2)n1—R1b, C(═O)—(CH2)n1—R1b, (C═O)—OR1b or cyano;
R1k is independently —(CH2)n1-cycloalkyl, —(CH2)n1-heterocycloalkyl, —(CH2)n1-aryl, —(CH2)n1-heteroaryl, optionally substituted by halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, lower hydroxyalkyl, hydroxy, C(═O)—R1b, (C═O)—OR1b, C(═O)—NH—R1b, C(═O)—NH—CH2—R1b, or cyano; and
n1 is 0 or 1.
In embodiment (ii), R1 and R2 are independently H or R2b;
each R2b is independently lower alkyl, lower alkoxy, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, or heterocycloalkyl alkylene, optionally substituted with one or more R2c;
R2c is R2d or R2e;
each R2d is independently halogen, cyano, oxo, or hydroxy;
each R2e is independently —OR2g, —N(R2g)2, —C(═O)(R2g), —C(═O)O(R2g), —C(═O)N(R2g)2, —N(R2g)C(═O)(R2g), —S(═O)2(R2g), —S(O)2N(R2g)2, lower alkyl, lower alkoxy, lower haloalkyl, aryl, heteroaryl, heteroaryloxy, cycloalkyl, or heterocycloalkyl, optionally substituted with one or more R2f;
each R2f is independently H, halogen, lower alkyl, lower alkoxy, oxo, or lower haloalkyl; and
each R2g is independently H, lower alkyl, lower alkoxy, lower haloalkyl, or aryl.
In embodiment (iii) R1 is H and
R2 is
X is C(R3d)(R3e), N(R3d), S(═O)2, or O;
each X′ is independently halogen, lower alkyl, cyano, hydroxy, C(═O)—OR3g, C(═O)R3g, lower haloalkyl, lower hydroxyalkyl, heteroaryl, spiroheterocycloalkyl, spirocycloalkyl, lower alkoxy, lower alkylamino, or lower dialkylamino;
or two adjacent X′ come together to form a ring which can be saturated or unsaturated;
Y is C(R3a)2(C(R3i)2)mR;
R3a is independently H or R3b;
R3b is lower alkyl, lower alkoxy, aryl, benzyl, heteroaryl, cycloalkyl, heterocycloalkyl, or cycloalkylalkyl, optionally substituted with one or more R3c;
R3c is halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower hydroxyalkyl, lower haloalkyl, oxo, hydroxy, or cyano;
each R3d is independently H or R3f;
R3e is H, hydroxy, halogen or lower alkyl;
or R3d and R3e come together to form a spirocyclic ring system, wherein the spirocyclic ring system can optionally include one or more heteroatoms or heteroatom containing moieties such as C═O and wherein the spirocyclic ring system can be optionally substituted with one or more R3h;
or X′ and R3d come together to form a bicyclic ring system, optionally substituted with one or more R3h;
each R3f is independently lower alkyl, lower haloalkyl, halogen, lower alkoxy, lower hydroxyalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, lower alkylene-cycloalkyl, lower alkylene-heterocycloalkyl, lower alkylene-aryl, lower alkylene-heteroaryl, cyano, cyano lower alkyl, hydroxy, C(═O)—OR3g, C(═O)R3g or S(═O)2R3g;
each R3g is independently H, OR3i, aryl, heteroaryl, lower alkyl, cycloalkyl or heterocycloalkyl;
R3h is halogen, lower alkyl, lower alkoxy, hydroxy, hydroxy lower alkyl, lower haloalkyl, lower hydroxyalkylcyano, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, lower alkylene-cycloalkyl, lower alkylene-heterocycloalkyl, lower alkylene-aryl, lower alkylene-heteroaryl, —C(O)O—R3g or —S(O)2CH3;
each R3i is independently H, lower alkyl, or lower haloalkyl.
mR is 0 or 1; preferably 1.
nR is 0 or 1.
pR is 0 or 1; preferably 1.
qR is 0, 1, 2, 3, or 4; preferably 0, 1 or 2, more preferably 0 or 1.
In embodiment (iv), R1 is H or OH;
R2 is aryl, heterocycloalkyl, heteroaryl or cycloalkyl, each optionally substituted with one or more R4a;
each R4a is independently hydroxy, halo, oxo, lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, lower hydroxyalkyl, amino, lower alkylamino, lower dialkylamino, cyano, lower cyanoalkyl, cycloalkyl, heterocycloalkyl, C(═O)R4b, or S(═O)2R4b; and
each R4b is independently OH, cycloalkyl or lower alkyl.
In embodiment (v), R1 is H;
R2 is lower alkoxy or
or R1 and R2 together form heterocycloalkyl, optionally substituted with halogen or cyano;
R5a is H, cyano, lower alkyl, R5b, R5q or
R5b is cycloalkyl, heterocycloalkyl, heteroaryl, or aryl, wherein each is optionally substituted with one or more R5c;
each R5c is independently halo, hydroxy, cyano, lower alkyl, lower haloalkyl, lower alkoxy, lower hydroxyalkyl, cycloalkyl, C(═O)R5d, or S(═O)2R5d;
each R5d is independently OH or lower alkyl;
R5e is H, hydroxy lower alkyl, lower haloalkyl, or lower alkyl;
R5f is H, hydroxy, cyano, cyano lower alkyl, —C(═O)NH2, —C(═O)OH, —C(═O)OC(CH3)3, R5r, R5s or R5k;
R5g and R5h are each independently H, hydroxy, halo, lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, lower hydroxyalkyl, amino, lower alkylamino, lower dialkylamino, cyano, C(═O)R5d, S(═O)2R5d or CH2S(═O)2R5d; R5i is aryl, cycloalkyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more R5j;
each R5j is independently hydroxy, halo, lower alkyl, lower hydroxyalkyl, lower halo alkyl, or lower alkoxy;
each R5k is independently lower alkyl, hydroxy lower alkyl, lower alkoxy, lower haloalkyl, lower haloalkoxy, aryl lower alkyl, cycloalkyl or cycloalkyl lower alkyl, each optionally substituted with one or more R5m;
each R5m is independently lower alkyl, halo, hydroxy, lower alkoxy, lower haloalkyl, lower hydroxy alkyl, oxo, amino, cyano, cyano lower alkyl, S(═O)2R5n, C(═O)R5n, cycloalkyl, heterocycloalkyl, heteroaryl, lower alkyl sulfonylamino, lower alkyl sulfonyl, halo lower alkoxy, cycloalkyl, —C(═O)OCH3 or heterocycloalkenyl;
each R5n is independently H, hydroxy or lower alkyl;
each R5p is independently hydroxy, amino, oxo, lower alkyl, —C(═O)NH2, cyano, lower haloalkyl, benzyl, cyano lower alkyl, or —NHC(═O)OC(CH3)3;
R5q is lower alkoxyl, hydroxy lower alkyl, or lower haloalkyl;
or R5q and R5e together form heterocycloalkyl, cycloalkyl, indan-1-yl, aryl, or heteroaryl, optionally substituted with one or more R5p;
R5′ is aryl, heteroaryl, heterocycloalkyl, heterocycloalkyl lower alkyl, heteroaryl lower alkyl, aryl lower alkoxy, optionally substituted with one or more R5m;
R5s is —C(═O)R5t or —CH2C(═O)R5t;
R5t is heterocycloalkyl, optionally substituted with one or more R5u; and
each R5u is independently cyano, halo, lower alkyl, or lower alkyl sulfonyl.
In a more preferred embodiment (vi), R1 is H;
R2 is
R6a is H, cyano, lower alkyl, R6b or
R6b is cycloalkyl, heterocycloalkyl, heteroaryl, or aryl, wherein each is optionally substituted with one or more R6c;
each R6c is independently halo, hydroxy, cyano, lower alkyl, lower haloalkyl, lower alkoxy, lower hydroxyalkyl, cycloalkyl, C(═O)R6d, or S(═O)2R6d;
each R6d is independently OH or lower alkyl;
R6e is H, hydroxy lower alkyl, lower haloalkyl, or lower alkyl;
R6f is H, hydroxy, cyano, cyano lower alkyl, or R6k;
R6g and R6h are each independently H, hydroxy, halo, lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, lower hydroxyalkyl, amino, lower alkylamino, lower dialkylamino, cyano, C(═O)R6d, S(═O)2R6d or CH2S(═O)2R6d;
R6i is aryl, cycloalkyl, heterocycloalkyl, or heteroaryl, optionally substituted with one or more R6j;
each R6j is independently hydroxy, halo, lower alkyl, lower hydroxyalkyl, lower halo alkyl, or lower alkoxy;
each R6k is independently lower alkyl, hydroxy lower alkyl, lower alkoxy, lower haloalkyl, lower haloalkoxy, aryl lower alkyl, cycloalkyl or cycloalkyl lower alkyl, each optionally substituted with one or more R6m;
each R6m is independently lower alkyl, halo, hydroxy, lower alkoxy, lower haloalkyl, lower hydroxy alkyl, oxo, amino, cyano, cyano lower alkyl, S(═O)2R6n, C(═O)R6n, cycloalkyl, heterocycloalkyl, heteroaryl, or heterocycloalkenyl; and
each R6n is independently H, hydroxy or lower alkyl.
In a more preferred embodiment (vii), R1 is H;
R2 is lower alkoxy or
or R1 and R2 together form heterocycloalkyl, optionally substituted with halogen or cyano;
R7c is H or R7f;
R7d is H or lower alkyl;
each R7e is independently hydroxy, amino, oxo, lower alkyl, —C(═O)NH2, cyano, lower haloalkyl, benzyl, cyano lower alkyl, or —NHC(═O)OC(CH3)3;
R7f is lower alkyl, cycloalkyl, lower alkoxyl, hydroxy lower alkyl, or lower haloalkyl;
or R7f and R7d together form heterocycloalkyl, cycloalkyl, indan-1-yl, aryl, or heteroaryl, optionally substituted with one or more R7e;
R7g is H, hydroxy, cyano, —C(═O)NH2, —C(═O)OH, —C(═O)OC(CH3)3, R7h, or R7j;
R7h is lower alkyl, aryl, aryl lower alkyl, cycloalkyl, heteroaryl, heterocycloalkyl, heterocycloalkyl lower alkyl, heteroaryl lower alkyl, aryl lower alkoxy, lower alkoxy, optionally substituted with one or more R7i;
each R7i is independently hydroxy, cyano, amino, lower alkyl sulfonylamino, lower alkoxy, halo, lower alkyl, cyano lower alkyl, lower haloalkyl, lower alkyl sulfonyl, oxo, halo lower alkoxy, cycloalkyl, —C(═O)OCH3;
R7j is —C(═O)R7k or —CH2C(═O)R7k;
R7k is heterocycloalkyl, optionally substituted with one or more R7m; and
each R7m is independently cyano, halo, lower alkyl, or lower alkyl sulfonyl.
R1 and R2 are preferably as defined in option (iii) or (ii).
In an even more preferred embodiment,
R1 is H;
R2 is —CHR1a—C(O)—NR1eR1g;
R1a is cycloalkyl (preferably cyclopropyl), H, or lower alkyl;
R1d is cyano, —(CH2)n1—R**, C(O)—(CH2)n1—R** or C(O)—NH—(CH2)n1—R**, wherein R** is optionally substituted with one or more of halogen, lower haloalkyl, (C═O)—OR*, lower alkyl, lower alkoxy, lower haloalkoxy, or cyano;
R1e is H, cycloalkyl, aryl or lower alkyl, wherein cycloalkyl, aryl or lower alkyl can be optionally substituted with one or more R1d; more preferably R1e is cycloalkyl, aryl or lower alkyl, wherein cycloalkyl, aryl or lower alkyl can be optionally substituted with one or more R1d.
R1g is H;
R* is H or lower alkyl;
R** is cycloalkyl, aryl, heterocycloalkyl or heteroaryl; and
n1 is 0 or 1.
In an even more preferred embodiment,
R1 is H;
R2 is lower alkyl, heterocycloalkyl, aryl, heterocycloalkyl or cycloalkyl, wherein lower alkyl, cycloalkyl, aryl, heterocycloalkyl or cycloalkyl can be optionally substituted with one or more R2c; more preferably R2 is lower alkyl, heterocycloalkyl or cycloalkyl, optionally substituted with one or more R2c;
R2c is cycloalkyl, heterocycloalkyl, heteroaryl, aryl, OR*, halogen, cyano, COOR* or —S(O)2—R*, wherein cycloalkyl, heterocycloalkyl, heteroaryl and aryl can be optionally substituted by lower alkyl, lower alkoxy, or lower haloalkyl; more preferably R2c is heteroaryl, aryl, cyano, COOR* or —S(O)2—R*, wherein heteroaryl and aryl can be optionally substituted by lower alkyl, lower alkoxy, or lower haloalkyl; and and
R* is H or lower alkyl.
In an even more preferred embodiment,
R1 is H;
R2 is
X′ is halogen, hydroxy, lower hydroxyalkyl, C(O)OR3g or C(O)R3g;
or adjacent X′ come together to form a ring (such as an aromatic ring) which can be saturated or unsaturated;
Y is CH(R3b);
nR is 0 or 1;
pR is 0 or 1;
qR is 0 or 1;
R3b is H, cycloalkyl or lower alkyl;
R3g is OR*, cycloalkyl, aryl, heterocycloalkyl, or heteroaryl; more preferably R3g is heterocycloalkyl;
R* is H or lower alkyl;
X is CF2, CH2, O, or N(R3d) in which R3d is lower alkylene-aryl, heterocycloalkyl; or X is C(R3d)(R3e) in which R3d and R3e come together to form a (e.g., four to six-membered) spirocyclic ring system which can optionally include one or more heteroatoms (e.g., N, O or S) or heteroatom containing moieties and wherein the spirocyclic ring system can be optionally substituted with one or more R3h such as benzyl or —C(O)O—R*.
The compounds of the present invention can be administered to a patient in the form of a pharmaceutical composition which can optionally comprise one or more pharmaceutically acceptable excipient(s) and/or carrier(s).
The compounds of the present invention can be administered by various well known routes, including oral, rectal, intragastrical, intracranial and parenteral administration, e.g. intravenous, intramuscular, intranasal, intradermal, subcutaneous, and similar administration routes. Oral, intranasal and parenteral administration are particularly preferred. Depending on the route of administration different pharmaceutical formulations are required and some of those may require that protective coatings are applied to the drug formulation to prevent degradation of a compound of the invention in, for example, the digestive tract.
Thus, preferably, a compound of the invention is formulated as a syrup, an infusion or injection solution, a spray, a tablet, a capsule, a capslet, lozenge, a liposome, a suppository, a plaster, a band-aid, a retard capsule, a powder, or a slow release formulation. Preferably the diluent is water, a buffer, a buffered salt solution or a salt solution and the carrier preferably is selected from the group consisting of cocoa butter and vitebesole.
Particular preferred pharmaceutical forms for the administration of a compound of the invention are forms suitable for injectable use and include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. In all cases the final solution or dispersion form must be sterile and fluid. Typically, such a solution or dispersion will include a solvent or dispersion medium, containing, for example, water-buffered aqueous solutions, e.g. biocompatible buffers, ethanol, polyol, such as glycerol, propylene glycol, polyethylene glycol, suitable mixtures thereof, surfactants or vegetable oils. A compound of the invention can also be formulated into liposomes, in particular for parenteral administration. Liposomes provide the advantage of increased half life in the circulation, if compared to the free drug and a prolonged more even release of the enclosed drug.
Sterilization of infusion or injection solutions can be accomplished by any number of art recognized techniques including but not limited to addition of preservatives like anti-bacterial or anti-fungal agents, e.g. parabene, chlorobutanol, phenol, sorbic acid or thimersal. Further, isotonic agents, such as sugars or salts, in particular sodium chloride may be incorporated in infusion or injection solutions.
Production of sterile injectable solutions containing one or several of the compounds of the invention is accomplished by incorporating the respective compound in the required amount in the appropriate solvent with various ingredients enumerated above as required followed by sterilization. To obtain a sterile powder the above solutions are vacuum-dried or freeze-dried as necessary. Preferred diluents of the present invention are water, physiological acceptable buffers, physiological acceptable buffer salt solutions or salt solutions. Preferred carriers are cocoa butter and vitebesole. Excipients which can be used with the various pharmaceutical forms of a compound of the invention can be chosen from the following non-limiting list:
a) binders such as lactose, mannitol, crystalline sorbitol, dibasic phosphates, calcium phosphates, sugars, microcrystalline cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrrolidone and the like;
b) lubricants such as magnesium stearate, talc, calcium stearate, zinc stearate, stearic acid, hydrogenated vegetable oil, leucine, glycerids and sodium stearyl fumarates,
c) disintegrants such as starches, croscaramellose, sodium methyl cellulose, agar, bentonite, alginic acid, carboxymethyl cellulose, polyvinyl pyrrolidone and the like.
In one embodiment the formulation is for oral administration and the formulation comprises one or more or all of the following ingredients: pregelatinized starch, talc, povidone K 30, croscarmellose sodium, sodium stearyl fumarate, gelatin, titanium dioxide, sorbitol, monosodium citrate, xanthan gum, titanium dioxide, flavoring, sodium benzoate and saccharin sodium.
If a compound of the invention is administered intranasally in a preferred embodiment, it may be administered in the form of a dry powder inhaler or an aerosol spray from a pressurized container, pump, spray or nebulizer with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, a hydrofluoro-alkane such as 1,1,1,2-tetrafluoroethane (HFA 134A™) or 1,1,1,2,3,3,3-heptafluoropropane (HFA 227EA™), carbon dioxide, or another suitable gas. The pressurized container, pump, spray or nebulizer may contain a solution or suspension of the compound of the invention, e.g., using a mixture of ethanol and the propellant as the solvent, which may additionally contain a lubricant, e.g., sorbitan trioleate.
Other suitable excipients can be found in the Handbook of Pharmaceutical Excipients, published by the American Pharmaceutical Association, which is herein incorporated by reference.
It is to be understood that depending on the severity of the disorder and the particular type which is treatable with one of the compounds of the invention, as well as on the respective patient to be treated, e.g. the general health status of the patient, etc., different doses of the respective compound are required to elicit a therapeutic or prophylactic effect. The determination of the appropriate dose lies within the discretion of the attending physician. It is contemplated that the dosage of a compound of the invention in the therapeutic or prophylactic use of the invention should be in the range of about 0.1 mg to about 1 g of the active ingredient (i.e. compound of the invention) per kg body weight. However, in a preferred use of the present invention a compound of the invention is administered to a subject in need thereof in an amount ranging from 1.0 to 500 mg/kg body weight, preferably ranging from 1 to 200 mg/kg body weight. The duration of therapy with a compound of the invention will vary, depending on the severity of the disease being treated and the condition and idiosyncratic response of each individual patient. In one preferred embodiment of a prophylactic or therapeutic use, between 100 mg to 200 mg of the compound is orally administered to an adult per day, depending on the severity of the disease and/or the degree of exposure to disease carriers.
As is known in the art, the pharmaceutically effective amount of a given composition will also depend on the administration route. In general the required amount will be higher, if the administration is through the gastrointestinal tract, e.g., by suppository, rectal, or by an intragastric probe, and lower if the route of administration is parenteral, e.g., intravenous. Typically, a compound of the invention will be administered in ranges of 50 mg to 1 g/kg body weight, preferably 100 mg to 500 mg/kg body weight, if rectal or intragastric administration is used and in ranges of 10 to 100 mg/kg body weight, if parenteral administration is used.
If a person is known to be at risk of developing a disease treatable with a compound of the invention, prophylactic administration of the biologically active blood serum or the pharmaceutical composition according to the invention may be possible. In these cases the respective compound of the invention is preferably administered in above outlined preferred and particular preferred doses on a daily basis. Preferably, from 0.1 mg to 1 g/kg body weight once a day, preferably 10 to 200 mg/kg body weight. This administration can be continued until the risk of developing the respective disorder has lessened. In most instances, however, a compound of the invention will be administered once a disease/disorder has been diagnosed. In these cases it is preferred that a first dose of a compound of the invention is administered one, two, three or four times daily.
The compounds of the present invention are particularly useful for treating, ameliorating, or preventing influenza. Within the present invention, the term “influenza” includes influenza A, B, C, isavirus and thogotovirus and also covers bird flu and swine flu. The subject to be treated is not particularly restricted and can be any vertebrate, such as birds and mammals (including humans).
Without wishing to be bound by theory it is assumed that the compounds of the present invention are capable of inhibiting binding of host mRNA cap structures to the cap-binding domain (CBD), particularly of the influenza virus. More specifically it is assumed that they directly interfere with the CBD of the influenza PB2 protein. However, delivery of a compound into a cell may represent a problem depending on, e.g., the solubility of the compound or its capabilities to cross the cell membrane. The present invention not only shows that the claimed compounds have in vitro polymerase inhibitory activity but also in vivo antiviral activity.
A possible measure of the in vivo antiviral activity of the compounds having the formula I or (I) is the CPE assay disclosed herein. Preferably the compounds exhibit a % reduction of at least about 30% at 50 μM. In this connection, the reduction in the virus-mediated cytopathic effect (CPE) upon treatment with the compounds was calculated as follows: The cell viability of infected-treated and uninfected-treated cells was determined using an ATP-based cell viability assay (Promega). The response in relative luminescent units (RLU) of infected-untreated samples was subtracted from the response (RLU) of the infected-treated samples and then normalized to the viability of the corresponding uninfected sample resulting in % CPE reduction. Preferably the compounds exhibit an IC50 of at least about 45 μM, more preferably at least about 10 μM, in the CPE assay. The half maximal inhibitory concentration (IC50) is a measure of the effectiveness of a compound in inhibiting biological or biochemical function and was calculated from the RLU response in a given concentration series ranging from maximum 100 μM to at least 100 nM.
The compounds having the general formula (I) can be used in combination with one or more other medicaments. The type of the other medicaments is not particularly limited and will depend on the disorder to be treated. Preferably the other medicament will be a further medicament which is useful in treating, ameliorating or preventing a viral disease, more preferably a further medicament which is useful in treating, ameliorating or preventing influenza.
The following combinations of medicaments are envisaged as being particularly suitable:
This highly efficient drug combination would result in lower substance concentrations and hence improved dose-response-relationships and better side effect profiles. Moreover, advantages described under (i) for polymerase inhibitors would prevail for combinations of inhibitors of different antiviral targets with polymerase inhibitors.
The present invention not only shows that the compounds have in vitro polymerase inhibitory activity but also in vivo antiviral activity.
Various modifications and variations of the invention will be apparent to those skilled in the art without departing from the scope of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the relevant fields are intended to be covered by the present invention.
The following examples are merely illustrative of the present invention and should not be construed to limit the scope of the invention as indicated by the appended claims in any way.
Surface Plasmon Resonance Measurements (SPR)
SPR was performed on a Biacore X100 system equipped with CM7 sensor chips (GE Healthcare). The expression construct for PB2 cap binding domain (PB2-CBD) (residues 318-483) of the avian influenza strain A/duck/Shantou/4610/2003(H5N1) was synthesized by Geneart AG. Purified protein was kindly provided by Stephen Cusack and his co-workers (EMBL Grenoble, Guilligay et al., 2008). The protein concentration was determined by OD280 measurement using the extinction coefficient of 6990 M1·cm−1 at 280 nm. PB2-CBD was immobilized on the sensor surface by amine coupling according to the manufacturer's protocol using a protein concentration of 30 μg ml−1 and 5 mM m7GTP (Sigma-Aldrich) in 10 mM phosphate buffer pH 6.5 and HBS-EP buffer (GE Healthcare). Compound testing was performed in running buffer (10 mM TRIS, 3 mM EDTA, 150 mM NaCl, 0.005% (v/v) Surfactant p20 (GE Healthcare/Biacore), 1 mM DTT) at a final DMSO concentration of 0.5% (v/v) DMSO and a flow rate of 10 μl min−1. Sensorgrams were processed using double referencing and solvent correction for DMSO bulk effects. Affinity constants (Kd values) were determined using a linear curve fit model of Biacore X100 Evaluation Software.
Cap Fluorescence-Polarization Ligand Displacement (CapFP-LD) Assay
The expression construct for PB2 cap binding domain (PB2-CBD) (residues 318-483) of the avian influenza strain A/duck/Shantou/4610/2003(H5N1) was synthesized by Geneart AG. Purified protein was kindly provided by Stephen Cusack and his co-workers (EMBL Grenoble; Guilligay et al., 2008). PB2-CBD concentration was determined by OD280 measurement using the extinction coefficient of 6990 M−1·cm−1 at 280 nm, m7GTP-5FAM (Jena Bioscience) was used as fluorescent tracer. The concentrations of tracer and receptor were chosen according to their Kd value of 0.42 μM determined in assay buffer (10 mM HEPES pH 7.4, 100 mM NaAc, 10 mM Mg(Ac)2, 0.005% (v/v) protein-grade TWEEN 20) (Nikolovska-Coleska et al., 2004). A series of 2-fold dilutions of compound were prepared, transferred to 384-well plates (Corning #3676) at a final DMSO concentration of 10% (v/v). The tracer/protein mixture was added to a final concentration of 2 μM and 1.2 μM respectively. The plates were sealed and incubated shaking for 30 min before FP was measured. The data was analysed using GraphPad Prism to determine IC50 values and 95% confidence intervals using a 4-parameter logistic equation. Positive and negative controls were included to define top and bottom for curve fitting.
Cytopathic Effect (CPE) Assay
The influenza A virus (IAV) was obtained from American Tissue Culture Collection (A/Aichi/2/68 (H3N2); VR-547). Virus stocks were prepared by propagation of virus on Mardin-Darby canine kidney (MDCK; ATCC CCL-34) cells and infectious titres of virus stocks were determined by the 50% tissue culture infective dose (TCID50) analysis as described in Reed, L. J., and H. Muench., Am. J. Hyg. 1938, 27:493-497.
MDCK cells were seeded in 96-well plates at 2×104 cells/well using DMEM/Ham's F-12 (1:1) medium containing 10% foetal bovine serum (FBS), 2 mM L-glutamine and 1% antibiotics (all from PAA). Until infection the cells were incubated for 5 hrs at 37° C., 5.0% CO2 to form a ˜80% confluent monolayer on the bottom of the well. Each test compound was dissolved in DMSO and generally tested at 25 μM and 250 μM. In those cases where the compounds were not soluble at that concentration they were tested at the highest soluble concentration. The compounds were diluted in infection medium (DMEM/Ham's F-12 (1:1) containing 5 μg/ml trypsin, and 1% antibiotics) for a final plate well DMSO concentration of 1%. The virus stock was diluted in infection medium (DMEM/Ham's F-12 (1:1) containing 5 μg/ml Trypsin, 1% DMSO, and 1% antibiotics) to a theoretical multiplicity of infection (MOI) of 0.05.
After removal of the culture medium and one washing step with PBS, virus and compound were added together to the cells. In the wells used for cytotoxicity determination (i.e. in the absence of viral infection), no virus suspension was added. Instead, infection medium was added. Each treatment was conducted in two replicates. After incubation at 37° C., 5% CO2 for 48 hrs, each well was observed microscopically for apparent cytotoxicity, precipitate formation, or other notable abnormalities. Then, cell viability was determined using CellTiter-Glo luminescent cell viability assay (Promega). The supernatant was removed carefully and 65 μl of the reconstituted reagent were added to each well and incubated with gentle shaking for 15 min at room temperature. Then, 60 μl of the solution was transferred to an opaque plate and luminescence (RLU) was measured using Synergy HT plate reader (Biotek).
Relative cell viability values of uninfected-treated versus uninfected-untreated cells were used to evaluate cytotoxicity of the compounds. Substances with a relative viability below 80% at the tested concentration were regarded as cytotoxic and retested at lower concentrations.
Reduction in the virus-mediated cytopathic effect (CPE) upon treatment with the compounds was calculated as follows: The response (RLU) of infected-untreated samples was subtracted from the response (RLU) of the infected-treated samples and then normalized to the viability of the corresponding uninfected sample resulting in % CPE reduction. The half maximal inhibitory concentration (IC50) is a measure of the effectiveness of a compound in inhibiting biological or biochemical function and was calculated from the RLU response in a given concentration series ranging from a maximum 100 μM to at least 100 nM.
The compounds were synthesized following the procedures which are set out in WO 2009/106441, WO2009/106442, WO 2009/106444; WO 2011/117145, WO 2011/117160, WO 2011/144584, and WO 2011/144585.
The activity of the compounds was investigated using the Fp and CPE assays. The results are given in the following table.
This application claims the benefit of U.S. Provisional Patent Application No. 62/238,415, filed Oct. 7, 2015, which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62238415 | Oct 2015 | US |
