WO2018047109A1 - Composés pyridones polycycliques utiles en tant qu'agents antiviraux - Google Patents

Composés pyridones polycycliques utiles en tant qu'agents antiviraux Download PDF

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Publication number
WO2018047109A1
WO2018047109A1 PCT/IB2017/055427 IB2017055427W WO2018047109A1 WO 2018047109 A1 WO2018047109 A1 WO 2018047109A1 IB 2017055427 W IB2017055427 W IB 2017055427W WO 2018047109 A1 WO2018047109 A1 WO 2018047109A1
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alkyl
pharmaceutically acceptable
compound
acceptable salt
halo
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PCT/IB2017/055427
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English (en)
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Jiping Fu
Xianming Jin
Patrick Lee
Peichao Lu
Joseph Michael YOUNG
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Novartis Ag
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/12—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains three hetero rings
    • C07D471/14—Ortho-condensed systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/20—Antivirals for DNA viruses

Definitions

  • the present invention relates to novel tetracyclic pyridone compounds that are inhibitors of hepatitis virus replication, and are thus useful to treat viral infections, and particuiar!y hepatitis B virus (HBV).
  • the invention provides novel tetracyclic pyridone compounds as disclosed herein, pharmaceutical compositions containing such compounds, and methods of using these compounds and compositions in the treatment and prevention of HBV infections.
  • Hepatitis B virus belongs to the family of Hepadnaviridae, a group of small hepatotropic DNA viruses that replicate through the reverse transcription of an RNA intermediate.
  • the 3.2-kb HBV genome in viral particles is in a circular, partially double-stranded DNA conformation (relaxed circular DNA or rcDNA).
  • the HBV genome consists of four overlapping open reading frames (ORF), which encode for the core, polymerase (Pol), envelope, and X proteins.
  • ORF open reading frames
  • rcDNA is transcriptionally inert and must be converted into covalently closed circular DNA (cccDNA) in the nucleus of infected cells before viral RNAs can be transcribed.
  • cccDNA is the only template for HBV transcription and, because HBV RNA templates genomic reverse transcription, its persistence is required for persistent infection.
  • the envelope of HBV comprises a mixture of surface antigen proteins
  • the HBsAg coat is a mixture of three overlapping proteins: all three share a common region, which corresponds to the smallest of the three proteins (SHBsAg).
  • the mixture consists mostly of SHBsAg, but also includes Medium HBsAg, which comprises SHBsAg plus an additional polypeptide segment, and Large HBsAg, which comprises M HBsAg plus another added polypeptide segment.
  • the S, M and L HBsAg proteins also assemble into a subviral particle knows as the 22-nm particle, which is not infectious but contains the same proteins that envelope the infectious virus particles. Indeed, these subviral, non-infectious particles have been used as a vaccine, since they contain the same antigenic surface proteins that envelope the infectious HBV virion and thus elicit antibodies that recognize the infectious agent.
  • these subviral particles greatly outnumber infectious virions, and are believed to protect the infectious virions from the immune system of the infected host. By sheer numbers, they may act as decoys, distracting immune responses from the infectious virus particles, but in addition they are reported to suppress the function of immune ceils (monocytes, dendritic cells and natural killer ceils) and may thus impair the immune response to HBV. Because these subviral particles protect infectious HBV from the host immune system, reducing the level of subviral particles has been recognized as a viable therapeutic approach. See, e.g., WO2015/1 13990.
  • HBsAg hepatitis B surface antigen
  • HBV viral DNA polymerase
  • entecavir nucleoside/nucleotide inhibitors of the viral DNA polymerase
  • tenofovir nucleoside/nucleotide inhibitors of the viral DNA polymerase
  • these therapies cannot eradicate the intrahepatic HBV cccDNA pool in chronic hepatitis B patients or limit the transcription of HBsAg from the pre-existing cccDNA, nor do they affect the secretion of synthesized HBsAg into patients' blood to counteract the host innate immune response.
  • these HBV treatments are in most cases life-long therapies, and discontinuation often leads to virological relapse.
  • the invention provides compounds that reduce serum HbsAg levels and are believed to operate by suppression of the secretion of the 22 nm subviral particles containing HBsAg. These compounds are useful to treat HBV infections and to reduce the incidence of serious liver disorders caused by HBV infections.
  • the present invention provides novel compounds that inhibit secretion of
  • HBsAg from cells infected with hepatitis B virus and thereby reduce viral load and viral replication in patients having chronic HBV infection.
  • the compounds of the invention are suitable for treatment of patients with HBV.
  • the invention also provides pharmaceutical compositions containing the novel compounds as well as methods to use the compounds and compositions to inhibit hepatitis B virus replication, and to treat disease conditions associated with or caused by HBV. Further objects of this invention are described in the foliowing description and the examples.
  • the invention provides compounds of Formula (I):
  • the term "subject” refers to an animal.
  • the animal is a mammal.
  • a subject also refers to for example, primates (e.g., humans), cows, sheep, goats, horses, dogs, cats, rabbits, rats, mice, fish, birds and the like.
  • the subject is a human.
  • a "patient” as used herein refers to a human subject.
  • the term “inhibition” or “inhibiting” refers to the reduction or suppression of a given condition, symptom, or disorder, or disease, or a significant decrease in the baseline activity of a biological activity or process.
  • the term “treating” or “treatment” of any disease or disorder refers in one embodiment, to ameliorating the disease or disorder (i.e., slowing or arresting or reducing the development of the disease or at least one of the clinical symptoms thereof).
  • “treating” or “treatment” refers to alleviating or ameliorating at least one physical parameter including those which may not be discernible by the patient.
  • “treating” or “treatment” refers to modulating the disease or disorder, either physically, (e.g. , stabilization of a discernible symptom), physiologically, (e.g., stabilization of a physical parameter), or both.
  • “treating” or “treatment” refers to preventing or delaying the onset or development or progression of the disease or disorder.
  • Optionally substituted means the group referred to can be substituted at one or more positions by any one or any combination of the radicals listed thereafter.
  • the number, placement and selection of substituents is understood to encompass only those substitutions that a skilled chemist would expect to be reasonably stable; thus ⁇ ' would not be a substituent on an aryl or heteroaryl ring, for example, and a single carbon atom would not have three hydroxy or amino substituents.
  • optional substituents are typically up to four groups selected from halo, oxo, CN, amino, hydroxy, - C 1-3 alkyl, -OR*, -NR* 2 ,-SR*, -S0 2 R*, -COOR*, and -CONR* 2 , where each R* is
  • Aryl refers to a phenyl or naphthyl group unless otherwise specified.
  • Aryl groups may be optionally substituted with up to four groups selected from halo, CN, amino, hydroxy, C 1-3 alkyl, -OR*, -NR* 2 ,-SR*, -S0 2 R*, -
  • Halo or "halogen”, as used herein, may be fluorine, chlorine, bromine or iodine.
  • C - 6 alkyl or "C ⁇ Ce alkyl”, as used herein, denotes straight chain or branched alkyl having 1 -6 carbon atoms. If a different number of carbon atoms is specified, such as C 4 or C 3 , then the definition is to be amended accordingly, such as "C 1 _ 4 alkyl” will represent methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl and tert-butyl.
  • C - 6 alkylene or "C ⁇ Ce alkylene”, as used herein, denotes straight chain or branched alkyl having 1 -6 carbon atoms and two open valences for connection to two other groups. If a different number of carbon atoms is specified, such as C 4 or C 3 , then the definition is to be amended accordingly, such as “C ⁇ alkylene” will represent methylene (- CH 2 -), ethylene (-CH 2 CH 2 -), straight chain or branched propylene (-CH 2 CH 2 CH 2 - or -CH 2 - CHMe-CH 2 -), and the like.
  • alkoxy denotes straight chain or branched alkoxy (-0-
  • Ci -4 alkoxy will represent methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy and tert- butoxy.
  • Ci-4 Haloalkyl or "C C4 haloalkyl” as used herein, denotes straight chain or branched alkyl having 1 -4 carbon atoms wherein at least one hydrogen has been replaced with a halogen.
  • the number of halogen replacements can be from one up to the number of hydrogen atoms on the unsubstituted alkyl group. If a different number of carbon atoms is specified, such as C 6 or C 3 , then the definition is to be amended accordingly.
  • C 1-4 haloalkyl will represent methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl and tert- butyl that have at least one hydrogen substituted with halogen, such as where the halogen is fluorine: CF 3 CF 2 -, (CF 3 ) 2 CH-, CH 3 -CF 2 -, CF 3 CF 2 -, CF 3 , CF 2 H-, CF 3 CF 2 CH(CF 3 )- or CF 3 CF 2 CF 2 CF 2 -.
  • C 3 _8 cycloalkyl refers to a saturated monocyclic hydrocarbon ring of 3 to 8 carbon atoms. Examples of such groups include cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. If a different number of carbon atoms is specified, such as C 3 - C 6 , then the definition is to be amended accordingly.
  • “4- to 8-Membered heterocyclyl”, “5- to 6- membered heterocyclyl”, “3- to 10- membered heterocyclyl”, “3- to 14-membered heterocyclyl”, “4- to 14-membered heterocyclyl” and “5- to 14-membered heterocyclyl”, refers, respectively, to 4- to 8- membered, 5- to 6-membered, 3- to 10-membered, 3- to 14-membered, 4- to 14- membered and 5- to 14-membered heterocyclic rings; unless otherwise specified, such rings contain 1 to 7, 1 to 5, or 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur as ring members, and the rings may be saturated, or partially saturated but not aromatic.
  • heterocyclic group can be attached to another group at a nitrogen or a carbon atom.
  • heterocyclyl includes single ring groups, fused ring groups and bridged groups. Examples of such heterocyclyl include, but are not limited to pyrrolidine, piperidine, piperazine, pyrrolidinone, morpholine, tetrahydrofuran,
  • heterocyclic groups have 1 -2 heteroatoms selected from N, O and S as ring members, and 4-7 ring atoms, and are optionally substituted with up to four groups selected from halo, oxo, CN, amino, hydroxy, alkyl, -OR*, -NR* 2 ,-SR*, -S0 2 R*, -COOR*, and -CONR* 2 , where each R* is independently H or C 1-3 alkyl.
  • heterocyclic groups containing a sulfur atom are optionally substituted with one or two oxo groups on the sulfur.
  • Heteroaryl is a completely unsaturated (aromatic) ring.
  • heteroaryl refers to a 5-14 membered monocyclic- or bicyclic- or tricyclic-aromatic ring system, having 1 to 8 heteroatoms selected from N, O or S.
  • the heteroaryl is a 5- 10 membered ring or ring system (e.g., 5-7 membered monocyclic group or an 8-10 membered bicyclic group), often a 5-6 membered ring containing up to four heteroatoms selected from N, O and S, though often a heteroaryl ring contains no more than one divalent O or S in the ring.
  • Typical heteroaryl groups include furan, isothiazole, thiadiazole, oxadiazole, indazole, indole, quinoline, 2- or 3-thienyl, 2- or 3-furyl, 2- or 3-pyrrolyl, 2-, 4-, or 5-imidazolyl, 3-, 4-, or 5- pyrazolyl, 2-, 4-, or 5-thiazolyl, 3-, 4-, or 5-isothiazolyl, 2-, 4-, or 5- oxazolyl, 3-, 4-, or 5-isoxazolyl, 3- or 5-(1 ,2,4-triazolyl), 4- or 5-(1 ,2, 3-triazolyl), tetrazolyl, triazine, pyrimidine, 2-, 3-, or 4-pyridyl, 3- or 4-pyridazinyl, 3-, 4-, or 5-pyrazinyl, 2-pyrazinyl, and 2-, 4-, or 5-pyrimidinyl.
  • Heteroaryl groups are and are optionally substituted with up to four groups selected from halo, CN, amino, hydroxy, C 1-3 alkyl, -OR*, -NR* 2 ,-SR*, -S0 2 R*, - COOR*, and -CONR* 2 , where each R* is independently H or d -3 alkyl.
  • hydroxy or "hydroxyl” refers to the group -OH.
  • R 1 is H, halo, or C Cs alkyl
  • Z 1 is N or CR 2 ; where R 2 is selected from H, halo, and C C 3 alkyl;
  • Z 2 is N or CR 5 , where R 5 is selected from H, halo, CN, C C 3 alkyl, C 3 -C 6 cycloalkyl, C -C 3 haloalkyl, C ⁇ Cs alkoxy, and C ⁇ Cs haloalkoxy;
  • R 3 is H, C C 3 alkyl or C Cs alkoxy
  • R 4 is selected from R 11 , -OR 11 , -SR 11 , and -NRR 11 ;
  • R 11 is Ci-C 10 alkyl, C 3 -C 6 cycloalkyi, (C 3 -C 6 cycloalkyl)-C 1 -C 4 alkyl, oxetanyl, tetrahydrofuranyl, or tetrahydropyranyl, each of which is optionally substituted with up to three groups selected from halo, CN, -OR, d-C 4 alkyl, d-C 3 haloalkoxy, -NR 2 , and a 4-7 membered heterocyclic group containing one or two heteroatoms selected from N, O and S as ring members that is optionally substituted with one or two groups selected from halo, oxo, CN, R, -OR, and -NR 2 ;
  • R is independently selected at each occurrence from H and d-C 3 alkyl optionally substituted with one to three groups selected from halo, -OH, d-C 3 alkoxy, oxo, CN, -NH 2 , - NH(C C 3 alkyl), -N(d-C 3 alkyl) 2 , and cyclopropyl;
  • R groups directly attached to the same atom which may be C or N, can optionally be taken together to form a 3-6 membered ring that can optionally contain an added heteroatom selected from N, O and S as a ring member, and can be substituted by up to two groups selected from -OH, oxo, d-C 3 alkyl, and d-C 3 alkoxy;
  • R 6 is H, halo, d-C 3 alkoxy, or d-C 6 alkyl
  • R 7 is H, halo, d-C 3 alkoxy, or d-C 6 alkyl
  • R 8 is H or d-C 6 alkyl
  • R 9 is H, phenyl, 5- or 6-membered heteroaryl containing up to three heteroatoms selected from N, O and S as ring members, d-C 6 alkyl, C 3 -C 6 cycloalkyi, -0-(d-C 6 alkyl), or (C 3 -C 6 cycloalkyl)-C 1 -C 4 alkyl, where each alkyl, phenyl, heteroaryl and cycloalkyi is optionally substituted with up to three groups selected from halo, -OR, -NR 2 , CN, and - S0 2 (d-C 4 alkyl);
  • R 9 taken together with one group selected from R 6 and R 7 together with the intervening atoms forms a 3-7 membered cycloalkyi ring or a 3-7 membered heterocyclic ring containing N, O or S as a ring member; wherein the 3-7 membered cycloalkyi or heterocyclic ring is optionally substituted with up to three groups selected from R, -OR, - NR 2 , halo, CN, COOR, CONR 2 , and oxo;
  • W is -COOR 10 , -C(0)NH-S0 2 R, -C(0)NH-S0 2 NR 2 , 5-tetrazolyl, or 1 ,2,4-oxadiazol- 3-yl-5(4H)-one;
  • R 10 is H or d-C 6 alkyl that is optionally substituted with one or two groups selected from halo, -OR, oxo, CN, -NR 2 , COOR, and CONR 2 ;
  • R 4 is -OR 11 .
  • R 11 is -(CH 2 ) 2 -3-OMe.
  • R 9 taken together with R 7 forms a 3-7 membered cycloalkyi ring or a 3-7 membered heterocyclic ring containing N , O or S as a ring member; wherein the cycloalkyi or heterocyclic ring is optionally substituted with up to three groups selected from R, -OR, - NR 2 , halo, CN, COOR, CONR 2 , and oxo; or a pharmaceutically acceptable salt thereof.
  • R is C-i-C 6 alkyl; or a pharmaceutically acceptable salt thereof.
  • [0037] 1 A compound according to any of the preceding embodiments or a pharmaceutically acceptable salt thereof, wherein R 11 is ⁇ !-0 4 alkyl, optionally substituted with up to two groups selected from halo, CN, -OR, C -C 3 haloalkoxy, and a 4-7 membered heterocyclic group containing one or two heteroatoms selected from N, O and S as ring members that is optionally substituted with one or two groups selected from halo, oxo, CN, R, -OR, and -NR 2 .
  • R 9 taken together with one group selected from R 6 and R 7 forms a 4-6 membered cycloalkyi ring or a 5-6 membered heterocyclic ring containing N, O or S as a ring member; wherein the cycloalkyi or heterocyclic ring is optionally substituted with up to three groups selected from R, -OR, -NR 2 , halo, CN, COOR, CONR 2 , and oxo.
  • Z 1 is N, and Z 2 is CH;
  • Z 1 is CH, and Z 2 is N;
  • Z 1 is N, and Z 2 is N;
  • a pharmaceutical composition comprising a compound of any of the preceding embodiments admixed with at least one pharmaceutically acceptable carrier.
  • a method to treat a hepatitis B infection which comprises administering to a patient having a hepatitis B infection a compound of any of embodiments 1 -16 or a pharmaceutical composition of embodiment 17.
  • a method to inhibit replication of hepatitis B virus which comprises contacting the hepatitis B virus, either in vitro or in vivo, with a compound according to any one of embodiments 1 -16.
  • Another embodiment of the invention provides a compound as described above, or a pharmaceutically acceptable salt thereof, as a medicament.
  • composition comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
  • the pharmaceutical composition according to this invention further comprises a therapeutically effective amount of at least one other antiviral agent.
  • the invention also provides the use of a pharmaceutical composition as described hereinabove for the treatment of a HBV infection in a human being having or at risk of having the infection.
  • the invention also provides the use of a pharmaceutical composition as described hereinabove for the treatment of HBV infection in a human being having or at risk of having the disease.
  • Another aspect of the invention involves a method of treating or preventing a hepatitis B viral disease and/or infection in a human being by administering to the human being an antivirally effective amount of a compound of the invention, a pharmaceutically acceptable salt thereof, or a composition as described above, alone or in combination with at least one other antiviral agent, administered together or separately.
  • An additional aspect of this invention refers to an article of manufacture comprising a composition effective to treat a hepatitis B viral disease and/or infection; and packaging material comprising a label which indicates that the composition can be used to treat disease and/or infection by a hepatitis B virus; wherein the composition comprises a compound of formula (I) according to this invention or a pharmaceutically acceptable salt thereof.
  • Still another aspect of this invention relates to a method of inhibiting the replication of HBV, comprising exposing the virus to an effective amount of the compound of formula (I), or a salt thereof, under conditions where replication of the virus is inhibited.
  • This method can be practiced in vitro or in vivo.
  • the compound of Formula (I) is co-administered with or used in combination with at least one additional therapeutic agent selected from: an interferon or peginterferon, an HBV polymerase inhibitor, a viral entry inhibitor, a viral maturation inhibitor, a capsid assembly inhibitor, an HBV core modulator, a reverse transcriptase inhibitor, a TLR-agonist, or an immunomodulator.
  • at least one additional therapeutic agent selected from: an interferon or peginterferon, an HBV polymerase inhibitor, a viral entry inhibitor, a viral maturation inhibitor, a capsid assembly inhibitor, an HBV core modulator, a reverse transcriptase inhibitor, a TLR-agonist, or an immunomodulator.
  • Some particular therapeutic agents that may be used in combination with the compounds of the invention include immunomodulators described herein, interferon alfa 2a, interferon alfa-2b, pegylated interferon alfa-2a, pegylated interferon alfa-2b, TLR-7 and TLR-9 agonists, entecavir, tenofovir, cidofovir, telbivudine, didanosine, zalcitabine, stavudine, lamivudine, abacavir, emtricitabine, apricitabine, atevirapine, ribavirin, acyclovir, famciclovir, valacyclovir, ganciclovir, adefovir, efavirenz, nevirapine, delavirdine, and etravirine.
  • Suitable core modulators are disclosed in WO2013/096744; suitable HBV capsid inhibitors are described in US2015
  • additional agents may be combined with the compounds of this invention to create a single pharmaceutical dosage form.
  • these additional agents may be separately administered to the patient as part of a multiple dosage form, for example, using a kit.
  • Such additional agents may be administered to the patient prior to, concurrently with, or following the administration of a compound of the invention, or a pharmaceutically acceptable salt thereof.
  • these additional therapeutic agents may be administered separately from and optionally by different routes of administration and on different dosing schedules from the compound of the invention, provided the compound of the invention and the additional therapeutic agent are used concurrently for treatment of an HBV infection or a disorder caused or complicated by an HBV infection.
  • the dose range of the compounds of the invention applicable per day is usually from 0.01 to 100 mg/kg of body weight, preferably from 0.1 to 50 mg/kg of body weight.
  • Each dosage unit may conveniently contain from 5% to 95% active compound (w/w).
  • Preferably such preparations contain from 20% to 80% active compound.
  • the actual pharmaceutically effective amount or therapeutic dosage will of course depend on factors known by those skilled in the art such as age and weight of the patient, route of administration and severity of disease. In any case the combination will be administered at dosages and in a manner which allows a pharmaceutically effective amount to be delivered based upon patient's unique condition.
  • composition of this invention comprises a combination of a compound of the invention and one or more additional therapeutic or prophylactic agent
  • both the compound and the additional agent should be present at dosage levels of between about 10 to 100%, and more preferably between about 10 and 80% of the dosage normally administered in a monotherapy regimen.
  • Antiviral agents contemplated for use in such combination therapy include agents (compounds or biologicals) that are effective to inhibit the formation and/or replication of a virus in a human being, including but not limited to agents that interfere with either host or viral mechanisms necessary for the formation and/or replication of a virus in a human being.
  • Such agents can be selected from entecavir, tenofovir, cidofovir, telbivudine, didanosine, zalcitabine, stavudine, lamivudine, abacavir, emtricitabine, apricitabine, atevirapine, ribavirin, acyclovir, famciclovir, valacyclovir, ganciclovir, adefovir, efavirenz, nevirapine, delavirdine, and etravirine, and immunomodulators described herein including interferons and pegylated interferons, TLR-7 agonists, and TLR-9 agonists.
  • Many compounds of the invention contain one or more chiral centers. These compounds may be made and used as single isomers or as mixtures of isomers. Methods for separating the isomers, including diastereomers and enantiomers, are known in the art, and examples of suitable methods are described herein.
  • the compounds of the invention are used as a single substantially pure isomer, meaning at least 90% of a sample of the compound is the specified isomer and less than 10% of the sample is any other isomer or mixture of isomers. Preferably, at least 95% of the sample is a single isomer.
  • a suitable isomer is within the ordinary level of skill, as one isomer will typically be more active in the in vivo or in vitro assay described herein for measuring HBV activity, and will be the preferred isomer. Where in vitro activity differences between isomers are relatively small, e.g. less than about a factor of 4, a preferred isomer may be selected based on activity level against viral replication in cell culture, using methods such as those described herein: the isomer having a lower MIC (minimum inhibitory
  • the compounds of the invention may be synthesized by the general synthetic routes illustrated below, specific examples of which are described in more detail in the Examples.
  • an optical isomer or "a stereoisomer” refers to any of the various stereoisomeric configurations which may exist for a given compound of the present invention and includes geometric isomers. It is understood that a substituent may be attached at a chiral center of a carbon atom.
  • the term “chiral” refers to molecules which have the property of non-superimposability on their mirror image partner, while the term “achiral” refers to molecules which are superimposable on their mirror image partner. Therefore, the invention includes enantiomers, diastereomers or racemates of the compound.
  • Enantiomers are a pair of stereoisomers that are non- superimposable mirror images of each other.
  • a 1 :1 mixture of a pair of enantiomers is a "racemic” mixture.
  • the term is used to designate a racemic mixture where appropriate.
  • “Diastereoisomers” are stereoisomers that have at least two asymmetric atoms, but which are not mirror-images of each other. The absolute stereochemistry is specified according to the Cahn- Ingold- Prelog R-S system. When a compound is a pure enantiomer the stereochemistry at each chiral carbon may be specified by either R or S.
  • Resolved compounds whose absolute configuration is unknown can be designated (+) or (-) depending on the direction (dextro- or levorotatory) which they rotate plane polarized light at the wavelength of the sodium D line.
  • Certain compounds described herein contain one or more asymmetric centers or axes and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)- or (S)-.
  • the compounds can be present in the form of one of the possible isomers or as mixtures thereof, for example as pure optical isomers, or as isomer mixtures, such as racemates and diastereoisomer mixtures, depending on the number of asymmetric carbon atoms.
  • the present invention is meant to include all such possible stereoisomers, including racemic mixtures, diasteriomeric mixtures and optically pure forms.
  • Optically active (R)- and (S)- isomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques. If the compound contains a double bond, the substituent may be E or Z configuration. If the compound contains a di-substituted cycloalkyl, the cycloalkyl substituent may have a cis- or trans-configuration. All tautomeric forms are also intended to be included.
  • Any resulting mixtures of isomers can be separated on the basis of the physicochemical differences of the constituents, into the pure or substantially pure geometric or optical isomers or diastereomers, for example, by chromatography and/or fractional crystallization.
  • any resulting racemates of final products or intermediates can be resolved into the optical antipodes by known methods, e.g., by separation of the diastereomeric salts thereof, obtained with an optically active acid or base, and liberating the optically active acidic or basic compound.
  • a basic moiety may thus be employed to resolve the compounds of the present invention into their optical antipodes, e.g., by fractional crystallization of a salt formed with an optically active acid, e.g., tartaric acid, dibenzoyl tartaric acid, diacetyl tartaric acid, di-O.O'-p-toluoyl tartaric acid, mandelic acid, malic acid or camphor-10-sulfonic acid. Racemic products can also be resolved by chiral
  • HPLC high pressure liquid chromatography
  • the compounds of the present invention can also be obtained in the form of their hydrates, or include other solvents used for their crystallization.
  • the compounds of the present invention may inherently or by design form solvates with pharmaceutically acceptable solvents (including water); therefore, it is intended that the invention embrace both solvated and unsolvated forms.
  • solvate refers to a molecular complex of a compound of the present invention (including pharmaceutically acceptable salts thereof) with one or more solvent molecules.
  • solvent molecules are those commonly used in the pharmaceutical art, which are known to be innocuous to the recipient, e.g., water, ethanol, and the like.
  • hydrate refers to the complex where the solvent molecule is water.
  • the compounds of the present invention including salts, hydrates and solvates thereof, may inherently or by design form polymorphs.
  • salt refers to an acid addition or base addition salt of a compound of the present invention.
  • Salts include in particular
  • pharmaceutically acceptable salts refers to salts that retain the biological effectiveness and properties of the compounds of this invention and, which typically are not biologically or otherwise undesirable. In many cases, the compounds of the present invention are capable of forming acid and/or base salts by virtue of the presence of amino and/or carboxyl groups or groups similar thereto.
  • Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids, e.g., acetate, aspartate, benzoate, besylate,
  • Inorganic acids from which salts can be derived include, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like.
  • Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, toluenesulfonic acid, sulfosalicylic acid, and the like.
  • Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases.
  • Inorganic bases from which salts can be derived include, for example, ammonium salts and metals from columns I to XII of the periodic table.
  • the salts are derived from sodium, potassium, ammonium, calcium, magnesium, iron, silver, zinc, and copper; particularly suitable salts include ammonium, potassium, sodium, calcium and magnesium salts.
  • Organic bases from which salts can be derived include, for example, primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines, basic ion exchange resins, and the like.
  • Certain organic amines include isopropylamine, benzathine, cholinate, diethanolamine, diethylamine, lysine, meglumine, piperazine and tromethamine.
  • the pharmaceutically acceptable salts of the present invention can be synthesized from a basic or acidic moiety, by conventional chemical methods. Generally, such salts can be prepared by reacting free acid forms of these compounds with a stoichiometric amount of the appropriate base (such as Na, Ca, Mg, or K hydroxide, carbonate, bicarbonate or the like), or by reacting free base forms of these compounds with a stoichiometric amount of the appropriate acid. Such reactions are typically carried out in water or in an organic solvent, or in a mixture of the two. Generally, use of non-aqueous media like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile is desirable, where practicable. Lists of additional suitable salts can be found, e.g., in "Remington's
  • any formula given herein is intended to represent unlabeled forms as well as isotopically labeled forms of the compounds of the present invention having up to three atoms with non-natural isotope distributions, e.g., sites that are enriched in deuterium or 13 C or 15 N.
  • Isotopically labeled compounds have structures depicted by the formulas given herein except that one or more atoms are replaced by an atom having a selected atomic mass or mass number other than the natural-abundance mass distribution.
  • isotopes that can be usefully over-incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine, and chlorine, such as 2 H, 3 H, 1 1 C, 13 C, 14 C, 15 N, 18 F 31 P, 32 P, 35 S, 36 CI, 125 l respectively.
  • the invention includes various isotopically labeled compounds of the present invention, for example those into which radioactive isotopes, such as 3 H and 14 C, or those in which non-radioactive isotopes, such as 2 H and 13 C are present at levels substantially above normal isotope distribution.
  • Such isotopically labelled compounds are useful in metabolic studies (with 14 C, for example), reaction kinetic studies (with, for example 2 H or 3 H), detection or imaging techniques, such as positron emission tomography (PET) or single-photon emission computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients.
  • PET positron emission tomography
  • SPECT single-photon emission computed tomography
  • an 18 F labeled compound of the present invention may be particularly desirable for PET or SPECT studies.
  • Isotopically-labeled compounds of the present invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples and Preparations using an appropriate isotopically-labeled reagent in place of the non-labeled reagent typically employed. Labeled samples may be useful with quite low isotope incorporation, such as where a radiolabel is used to detect trace amounts of the compound.
  • deuterium i.e., 2 H or D
  • more extensive substitution with heavier isotopes may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements or an improvement in therapeutic index.
  • deuterium in this context is regarded as a substituent of a compound of the present invention, and typically a sample of a compound having deuterium as a substituent has at least 50% deuterium incorporation at the labeled position(s).
  • concentration of such a heavier isotope, specifically deuterium may be defined by the isotopic enrichment factor.
  • isotopic enrichment factor means the ratio between the isotopic abundance and the natural abundance of a specified isotope. If a substituent in a compound of this invention is denoted deuterium, such compound has an isotopic enrichment factor for each designated deuterium atom of at least 3500 (52.5% deuterium incorporation at each designated deuterium atom), at least 4000 (60% deuterium incorporation), at least 4500 (67.5% deuterium incorporation), at least 5000 (75% deuterium incorporation), at least 5500 (82.5% deuterium incorporation), at least 6000 (90% deuterium incorporation), at least 6333.3 (95% deuterium incorporation), at least 6466.7 (97% deuterium incorporation), at least 6600 (99% deuterium incorporation), or at least 6633.3 (99.5% deuterium incorporation).
  • compositions in accordance with the invention include those wherein the solvent of crystallization may be isotopically substituted, e.g. D 2 0, d 6 -acetone, d 6 -DMSO.
  • Compounds of the present invention that contain groups capable of acting as donors and/or acceptors for hydrogen bonds may be capable of forming co-crystals with suitable co-crystal formers.
  • These co-crystals may be prepared from compounds of the present invention by known co-crystal forming procedures. Such procedures include grinding, heating, co-subliming, co-melting, or contacting in solution compounds of the present invention with the co-crystal former under crystallization conditions and isolating co- crystals thereby formed.
  • Suitable co-crystal formers include those described in WO 2004/078163. Hence the invention further provides co-crystals comprising a compound of the present invention.
  • the compounds of the invention can be administered by known methods, including oral, parenteral, inhalation, and the like.
  • the compound of the invention is administered orally, as a pill, lozenge, troche, capsule, solution, or suspension.
  • a compound of the invention is administered by injection or infusion. Infusion is typically performed intravenously, often over a period of time between about 15 minutes and 4 hours.
  • a compound of the invention is administered intranasally or by inhalation; inhalation methods are particularly useful for treatment of respiratory infections.
  • Compounds of the present invention exhibit oral bioavailability, so oral administration is sometimes preferred.
  • a compound of the present invention is used in combination with a second antiviral agent, such as those named herein.
  • combination is meant either a fixed combination in one dosage unit form, as separate dosage forms suitable for use together either simultaneously or sequentially, or as a kit of parts for the combined administration where a compound of the present invention and a combination partner may be administered independently at the same time or separately within time intervals that especially allow that the combination partners show a cooperative, e.g., synergistic, effect, or any combination thereof.
  • the second antiviral agent may be administered in combination with the compounds of the present inventions wherein the second antiviral agent is administered prior to, simultaneously, or after the compound or compounds of the present invention.
  • a compound of the invention may be formulated with a second agent into the same dosage form.
  • An example of a dosage form containing a compound of the invention and a second agent is a tablet or a capsule.
  • a combination of a compound of the invention and a second antiviral agent may provide synergistic activity.
  • the compound of the invention and second antiviral agent may be administered together, separate but simultaneously, or sequentially.
  • An "effective amount" of a compound is that amount necessary or sufficient to treat or prevent a viral infection and/or a disease or condition described herein.
  • an effective amount of a compound of Formula I is an amount sufficient to treat viral infection in a subject.
  • an effective amount is an amount sufficient to treat HBV in a subject in need of such treatment.
  • the effective amount can vary depending on such factors as the size and weight of the subject, the type of illness, or the particular compound of the invention. For example, the choice of the compound of the invention can affect what constitutes an "effective amount.”
  • One of ordinary skill in the art would be able to study the factors contained herein and make the determination regarding the effective amount of the compounds of the invention without undue experimentation.
  • the regimen of administration can affect what constitutes an effective amount.
  • the compound of the invention can be administered to the subject either prior to or after the onset of a viral infection. Further, several divided dosages, as well as staggered dosages, can be administered daily or sequentially, or the dose can be continuously infused, or can be a bolus injection. Further, the dosages of the compound(s) of the invention can be proportionally increased or decreased as indicated by the exigencies of the therapeutic or prophylactic situation.
  • Compounds of the invention may be used in the treatment of states, disorders or diseases as described herein, or for the manufacture of pharmaceutical compositions for use in the treatment of these diseases.
  • the invention provides methods of use of compounds of the present invention in the treatment of these diseases or for preparation of pharmaceutical compositions having compounds of the present invention for the treatment of these diseases.
  • composition includes preparations suitable for administration to mammals, e.g. , humans.
  • the compounds of the present invention can be given per se or as a pharmaceutical composition containing, for example, 0.1 to 99.5% (more preferably, 0.5 to 90%) of at least one compound of Formula (I) or any subgenus thereof as active ingredient in combination with a pharmaceutically acceptable carrier, or optionally two or more pharmaceutically acceptable carriers.
  • phrases "pharmaceutically acceptable carrier” is art recognized and includes a pharmaceutically acceptable material, composition or vehicle, suitable for administering compounds of the present invention to mammals.
  • the carriers include liquid or solid filler, diluent, excipient, solvent or encapsulating material, involved in carrying or transporting the subject agent from one organ, or portion of the body, to another organ, or portion of the body.
  • Each carrier must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not injurious to the patient.
  • materials which can serve as pharmaceutically acceptable carriers include: sugars, such as lactose, glucose and sucrose; starches, such as corn starch and potato starch; cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients, such as cocoa butter and suppository waxes; oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; glycols, such as propylene glycol; polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; esters, such as ethyl oleate and ethyl laurate; agar; buffering agents, such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline; Ringer'
  • wetting agents such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, release agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the compositions.
  • antioxidants examples include: water soluble antioxidants, such as ascorbic acid, cysteine hydrochloride, sodium bisulfate, sodium metabisulfite, sodium sulfite and the like; oil-soluble antioxidants, such as ascorbyl palmitate, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lecithin, propyl gallate, -tocopherol, and the like; and metal chelating agents, such as citric acid, ethylenediamine tetraacetic acid (EDTA), sorbitol, tartaric acid, phosphoric acid, and the like.
  • water soluble antioxidants such as ascorbic acid, cysteine hydrochloride, sodium bisulfate, sodium metabisulfite, sodium sulfite and the like
  • oil-soluble antioxidants such as ascorbyl palmitate, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lecithin,
  • Formulations of the present invention include those suitable for oral, nasal, inhalation, topical, transdermal, buccal, sublingual, rectal, vaginal and/or parenteral administration.
  • the formulations may conveniently be presented in unit dosage form and may be prepared by any methods well known in the art of pharmacy.
  • the amount of active ingredient that can be combined with a carrier material to produce a single dosage form will generally be that amount of the compound that produces a therapeutic effect. Generally, out of one hundred per cent, this amount will range from about 1 per cent to about ninety- nine percent of active ingredient, preferably from about 5 per cent to about 70 per cent, most preferably from about 10 per cent to about 30 per cent.
  • Methods of preparing these formulations or compositions include the step of bringing into association a compound of the present invention with the carrier and, optionally, one or more accessory ingredients.
  • the formulations are prepared by uniformly and intimately bringing into association a compound of the present invention with liquid carriers, or finely divided solid carriers, or both, and then, if necessary, shaping the product.
  • Formulations of the invention suitable for oral administration may be in the form of capsules, cachets, pills, tablets, lozenges (using a flavored base, for example, usually sucrose and acacia or tragacanth), powders, granules, or as a solution or a suspension in an aqueous or non-aqueous liquid, or as an oil-in-water or water-in-oil liquid emulsion, or as an elixir or syrup, or as pastilles (using an inert base, such as gelatin and glycerin, or sucrose and acacia) and/or as mouth washes and the like, each containing a predetermined amount of a compound of the present invention as an active ingredient.
  • a compound of the present invention may also be administered as a bolus, electuary or paste.
  • the active ingredient is mixed with one or more pharmaceutically acceptable carriers, such as sodium citrate or dicalcium phosphate, and/or any of the following: fillers or extenders, such as starches, lactose, sucrose, glucose, mannitol, and/or silicic acid; binders, such as, for example,
  • disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate
  • solution retarding agents
  • compositions may also comprise buffering agents.
  • Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugars, as well as high molecular weight polyethylene glycols and the like.
  • a tablet may be made by compression or molding, optionally with one or more accessory ingredients.
  • Compressed tablets may be prepared using binder (for example, gelatin or hydroxypropylmethyl cellulose), lubricant, inert diluent, preservative, disintegrant (for example, sodium starch glycolate or cross-linked sodium carboxymethyl cellulose), surface-active or dispersing agent.
  • Molded tablets may be made by molding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent.
  • compositions of the present invention may optionally be scored or prepared with coatings and shells, such as enteric coatings and other coatings well known in the pharmaceutical-formulating art. They may also be formulated so as to provide slow or controlled release of the active ingredient therein using, for example, hydroxypropylmethyl cellulose in varying proportions to provide the desired release profile, other polymer matrices, liposomes and/or microspheres. They may be sterilized by, for example, filtration through a bacteria-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions that can be dissolved in sterile water, or some other sterile injectable medium immediately before use. These compositions may also optionally contain opacifying agents and may be of a composition that they release the active ingredient(s) only, or preferentially, in a certain portion of the
  • compositions that can be used include polymeric substances and waxes.
  • the active ingredient can also be in micro-encapsulated form, if appropriate, with one or more of the above-described excipients.
  • Liquid dosage forms for oral administration of the compounds of the invention include pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs.
  • the liquid dosage forms may contain inert diluent commonly used in the art, such as, for example, water or other solvents, solubilizing agents and emulsifiers, such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1 ,3-butylene glycol, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor and sesame oils), glycerol, tetrahydrofuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof.
  • inert diluent commonly used in the art, such as, for example, water or other solvents, solubilizing agents and
  • the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, coloring, perfuming and preservative agents.
  • adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, coloring, perfuming and preservative agents.
  • Suspensions in addition to the active compounds, may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar and tragacanth, and mixtures thereof.
  • suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar and tragacanth, and mixtures thereof.
  • Formulations of the pharmaceutical compositions of the invention for rectal or vaginal administration may be presented as a suppository, which may be prepared by mixing one or more compounds of the invention with one or more suitable nonirritating excipients or carriers comprising, for example, cocoa butter, polyethylene glycol, a suppository wax or a salicylate, and which is solid at room temperature, but liquid at body temperature and, therefore, will melt in the rectum or vaginal cavity and release the active compound.
  • suitable nonirritating excipients or carriers comprising, for example, cocoa butter, polyethylene glycol, a suppository wax or a salicylate, and which is solid at room temperature, but liquid at body temperature and, therefore, will melt in the rectum or vaginal cavity and release the active compound.
  • Formulations of the present invention which are suitable for vaginal administration also include pessaries, tampons, creams, gels, pastes, foams or spray formulations containing such carriers as are known in the art to be appropriate.
  • Dosage forms for the topical or transdermal administration of a compound of this invention include powders, sprays, ointments, pastes, creams, lotions, gels, solutions, patches and inhalants.
  • the active compound may be mixed under sterile conditions with a pharmaceutically acceptable carrier, and with any preservatives, buffers, or propellants that may be required.
  • the ointments, pastes, creams and gels may contain, in addition to an active compound of this invention, excipients, such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc and zinc oxide, or mixtures thereof.
  • excipients such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc and zinc oxide, or mixtures thereof.
  • Powders and sprays can contain, in addition to a compound of this invention, excipients such as lactose, talc, silicic acid, aluminum hydroxide, calcium silicates and polyamide powder, or mixtures of these substances.
  • Sprays can additionally contain customary propellants, such as chlorofluorohydrocarbons and volatile unsubstituted hydrocarbons, such as butane and propane.
  • Transdermal patches have the added advantage of providing controlled delivery of a compound of the present invention to the body.
  • dosage forms can be made by dissolving or dispersing the compound in the proper medium.
  • Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate of such flux can be controlled by either providing a rate controlling membrane or dispersing the active compound in a polymer matrix or gel.
  • Ophthalmic formulations are also contemplated as being within the scope of this invention.
  • compositions of this invention suitable for parenteral administration may comprise one or more compounds of the invention in combination with one or more pharmaceutically acceptable carriers such as sterile isotonic aqueous or nonaqueous solutions, dispersions, suspensions or emulsions, or sterile powders which may be reconstituted into sterile injectable solutions or dispersions just prior to use, which may contain antioxidants, buffers, bacteriostats, solutes which render the formulation isotonic with the blood of the intended recipient or suspending or thickening agents.
  • pharmaceutically acceptable carriers such as sterile isotonic aqueous or nonaqueous solutions, dispersions, suspensions or emulsions, or sterile powders which may be reconstituted into sterile injectable solutions or dispersions just prior to use, which may contain antioxidants, buffers, bacteriostats, solutes which render the formulation isotonic with the blood of the intended recipient or suspending or thickening agents.
  • aqueous and nonaqueous carriers examples include water, ethanol, glycol ethers, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils, such as olive oil, and injectable organic esters, such as ethyl oleate.
  • suitable aqueous and nonaqueous carriers include water, ethanol, glycol ethers, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils, such as olive oil, and injectable organic esters, such as ethyl oleate.
  • Proper fluidity can be maintained, for example, by the use of coating materials, such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants.
  • compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents. Prevention of the action of microorganisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents, such as sugars, sodium chloride, and the like into the compositions. In addition, prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents that delay absorption such as aluminum monostearate and gelatin.
  • adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents. Prevention of the action of microorganisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents, such as sugars, sodium chloride, and
  • Injectable depot forms are made by forming microencapsule matrices of the subject compounds in biodegradable polymers such as polylactide-polyglycolide.
  • the rate of drug release can be controlled.
  • biodegradable polymers include poly(orthoesters) and poly(anhydrides).
  • Depot injectable formulations are also prepared by entrapping the drug in liposomes or microemulsions that are compatible with body tissue.
  • the preparations of the present invention may be given orally, parenterally, topically, or rectally. They are of course given by forms suitable for each administration route. For example, they are administered in tablets or capsule form, by injection, inhalation, eye lotion, ointment, suppository, etc., administration by injection, infusion or inhalation; topical by lotion or ointment; and rectal by suppositories.
  • parenteral administration and “administered parenterally” as used herein means modes of administration other than enteral and topical administration, usually by injection, and includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal,
  • Intravenous infusion is sometimes a preferred method of delivery for compounds of the invention.
  • Infusion may be used to deliver a single daily dose or multiple doses.
  • a compound of the invention is administered by infusion over an interval between 15 minutes and 4 hours, typically between 0.5 and 3 hours. Such infusion may be used once per day, twice per day or up to three times per day.
  • peripheral administration and “administered peripherally” as used herein mean the administration of a compound, drug or other material other than directly into the central nervous system, such that it enters the patient's system and, thus, is subject to metabolism and other like processes, for example, subcutaneous administration.
  • These compounds may be administered to humans and other animals for therapy by any suitable route of administration, including orally, nasally, as by, for example, a spray, rectally, intravaginally, parenterally, intracisternally and topically, as by powders, ointments or drops, including buccally and sublingually.
  • the compounds of the present invention which may be used in a suitable hydrated form, and/or the
  • compositions of the present invention are formulated into pharmaceutically acceptable dosage forms by conventional methods known to those of skill in the art.
  • compositions of this invention may be varied so as to obtain an amount of the active ingredient which is effective to achieve the desired therapeutic response for a particular patient, composition, and mode of administration, without being toxic to the patient.
  • the selected dosage level will depend upon a variety of factors including the activity of the particular compound of the present invention employed, or the ester, salt or amide thereof, the route of administration, the time of administration, the rate of excretion of the particular compound being employed, the duration of the treatment, other drugs, compounds and/or materials used in combination with the particular compound employed, the age, sex, weight, condition, general health and prior medical history of the patient being treated, and like factors well known in the medical arts.
  • a physician or veterinarian having ordinary skill in the art can readily determine and prescribe the effective amount of the pharmaceutical composition required.
  • the physician or veterinarian could start doses of the compounds of the invention employed in the pharmaceutical composition at levels lower than that required in order to achieve the desired therapeutic effect and gradually increase the dosage until the desired effect is achieved.
  • a suitable daily dose of a compound of the invention will be that amount of the compound that is the lowest dose effective to produce a therapeutic effect. Such an effective dose will generally depend upon the factors described above. Generally, intravenous and subcutaneous doses of the compounds of this invention for a patient, when used for the indicated effects, will range from about 0.0001 to about 100 mg per kilogram of body weight per day, more preferably from about 0.01 to about 50 mg per kg per day, and still more preferably from about 0.1 to about 20 mg per kg per day. An effective amount is that amount which prevents or treats a viral infection, such as HBV.
  • the effective daily dose of the active compound may be administered as a single dose per day, or as two, three, four, five, six or more sub-doses administered separately at appropriate intervals throughout the day, optionally, in unit dosage forms.
  • Compounds delivered orally or by inhalation are commonly administered in one to four doses per day.
  • Compounds delivered by injection are typically administered once per day, or once every other day.
  • Compounds delivered by infusion are typically administered in one to three doses per day.
  • the doses may be administered at intervals of about 4 hours, about 6 hours, about 8 hours or about 12 hours.
  • methods of using the compounds of the invention include administering the compound as a pharmaceutical composition, wherein at least one compound of the invention is admixed with a pharmaceutically acceptable carrier prior to administration.
  • the Programmed Death 1 (PD-1) protein is an inhibitory member of the extended CD28/CTLA4 family of T cell regulators (Okazaki et al. (2002) Curr Opin Immunol 14: 391779-82; Bennett et al. (2003) J. Immunol. 170:71 1 -8).
  • PD-1 is expressed on activated B cells, T cells, and monocytes.
  • PD-1 is an immune- inhibitory protein that negatively regulates TCR signals (Ishida, Y. et al. (1992) EMBO J. 1 1 :3887-3895; Blank, C.
  • Immune suppression can be reversed by inhibiting the local interaction of PD-1 with PD-L1 or PD-L2; the effect is additive when the interaction of PD-1 with PD-L2 is blocked as well (Iwai et al. (2002) Proc. Nat'l. Acad. Sci. USA 99:12293-7; Brown et al. (2003) J. Immunol. 170:1257-66).
  • Immunomodulation can be achieved by binding to either the immune- inhibitory protein (e.g., PD-1 ) or to binding proteins that modulate the inhibitory protein (e.g., PD-L1 , PD-L2).
  • the combination therapies of the invention include an immunomodulator that is an inhibitor or antagonist of an inhibitory molecule of an immune checkpoint molecule.
  • the immunomodulator binds to a protein that naturally inhibits the immuno-inhibitory checkpoint molecule.
  • these immunomodulators can enhance the antiviral response, and thus enhance efficacy relative to treatment with the antiviral compound alone.
  • the term "immune checkpoints" refers to a group of molecules on the cell surface of CD4 and CD8 T cells. These molecules can effectively serve as "brakes” to down-modulate or inhibit an adaptive immune response.
  • Immune checkpoint molecules include, but are not limited to, Programmed Death 1 (PD-1 ), Cytotoxic T-Lymphocyte Antigen 4 (CTLA-4), B7H1 , B7H4, OX-40, CD137, CD40, and LAG3, which directly inhibit immune cells.
  • Immunotherapeutic agents which can act as immune checkpoint inhibitors useful in the methods of the present invention include, but are not limited to, inhibitors of PD-L1 , PD-L2, CTLA4, TIM3, LAG3, VISTA, BTLA, TIGIT, LAIR1 , CD160, 2B4 and/or TGFR beta. Inhibition of an inhibitory molecule can be performed by inhibition at the DNA, RNA or protein level.
  • an inhibitory nucleic acid e.g., a dsRNA, siRNA or shRNA
  • the inhibitor of an inhibitory signal is a polypeptide, e.g., a soluble ligand, or an antibody or antigen-binding fragment thereof, that binds to the inhibitory molecule.
  • the immunomodulator can be administered concurrently with, prior to, or subsequent to, one or more compounds of the invention, and optionally one or more additional therapies or therapeutic agents.
  • the therapeutic agents in the combination can be administered in any order. In general, each agent will be administered at a dose and/or on a time schedule determined for that agent. It will further be appreciated that the therapeutic agents utilized in this combination may be administered together in a single composition or administered separately in different compositions. In general, it is expected that each of the therapeutic agents utilized in combination be utilized at levels that do not exceed the levels at which they are utilized individually. In some embodiments, the levels utilized in combination will be lower than those utilized individually.
  • the antiviral compounds described herein are administered in combination with one or more immunomodulators that are inhibitors of PD- 1 , PD-L1 and/or PD-L2.
  • Each such inhibitor may be an antibody, an antigen binding fragment thereof, an immunoadhesin, a fusion protein, or an oligopeptide. Examples of such immunomodulators are known in the art.
  • the immunomodulator is an anti-PD-1 antibody chosen from MDX-1 106, Merck 3475 or CT- 01 1 .
  • the immunomodulator is an immunoadhesin (e.g., an immunoadhesin comprising an extracellular or PD-1 binding portion of PD-LI or PD-L2 fused to a constant region (e.g., an Fc region of an immunoglobulin sequence).
  • an immunoadhesin e.g., an immunoadhesin comprising an extracellular or PD-1 binding portion of PD-LI or PD-L2 fused to a constant region (e.g., an Fc region of an immunoglobulin sequence).
  • the immunomodulator is a PD-1 inhibitor such as
  • the immunomodulator is a PD-LI inhibitor such as anti-PD-LI antibody.
  • the immunomodulator is an anti-PD-LI binding antagonist chosen from YW243.55.S70, MPDL3280A, MEDI-4736, MSB-0010718C, or MDX-1 105.
  • MDX-1 105 also known as BMS-936559, is an anti-PD-LI antibody described in WO2007/005874.
  • Antibody YW243.55.S70 is an anti-PD-LI described in WO 2010/077634.
  • the immunomodulator is nivolumab (CAS Registry Number: 946414-94-4).
  • Alternative names for nivolumab include MDX-1 106, MDX-1 106- 04, ONO-4538, or BMS-936558.
  • Nivolumab is a fully human lgG4 monoclonal antibody which specifically blocks PD-1 .
  • Nivolumab (clone 5C4) and other human monoclonal antibodies that specifically bind to PD-1 are disclosed in US 8,008,449, EP2161336 and WO2006/121 168.
  • the immunomodulator is an anti-PD-1 antibody Pembrolizumab.
  • Pembrolizumab also referred to as Lambrolizumab, MK-3475, MK03475, SCH-900475 or KEYTRUDA®; Merck
  • Pembrolizumab and other humanized anti-PD-1 antibodies are disclosed in Hamid, O. et al. (2013) New England Journal of Medicine 369 (2): 134-44, US 8,354,509, WO2009/1 14335, and WO2013/079174.
  • the immunomodulator is Pidilizumab (CT-01 1 ; Cure Tech), a humanized lgG1 k monoclonal antibody that binds to PD1 .
  • Pidilizumab and other humanized anti-PD-1 monoclonal antibodies are disclosed in WO2009/10161 1 .
  • anti-PD1 antibodies useful as immunomodulators for use in the methods disclosed herein include AMP 514 (Amplimmune), and anti-PD1 antibodies disclosed in US 8,609,089, US 2010028330, and/or US 201201 14649. In some
  • the anti-PD-L1 antibody is MSB0010718C.
  • MSB0010718C also referred to as A09-246-2; Merck Serono
  • A09-246-2 Merck Serono
  • the immunomodulator is MDPL3280A (Genentech / Roche), a human Fc optimized lgG1 monoclonal antibody that binds to PD-L1 .
  • MDPL3280A and other human monoclonal antibodies to PD-L1 are disclosed in U.S. Patent No.: 7,943,743 and U.S Publication No.: 20120039906.
  • Other anti-PD-L1 binding agents useful as immunomodulators for methods of the invention include YW243.55.S70 (see WO2010/077634), MDX-1 105 (also referred to as BMS-936559), and anti-PD-L1 binding agents disclosed in WO2007/005874.
  • the immunomodulator is AMP-224 (B7-DCIg;
  • Amplimmune e.g., disclosed in WO2010/027827 and WO201 1/066342
  • Amplimmune is a PD-L2 Fc fusion soluble receptor that blocks the interaction between PD1 and B7-H1 .
  • the immunomodulator is an anti-LAG-3 antibody such as BMS-986016.
  • BMS-986016 (also referred to as BMS986016) is a monoclonal antibody that binds to LAG-3.
  • BMS-986016 and other humanized anti-LAG-3 antibodies are disclosed in US 201 1 /0150892, WO2010/019570, and WO2014/008218
  • the combination therapies disclosed herein include a modulator of a costimulatory molecule or an inhibitory molecule, e.g., a co-inhibitory ligand or receptor.
  • the costimulatory modulator, e.g., agonist, of a costimulatory molecule is chosen from an agonist (e.g., an agonistic antibody or antigen- binding fragment thereof, or soluble fusion) of OX40, CD2, CD27, CDS, ICAM-1 , LFA-1 (CD1 1 a/CD18), ICOS (CD278), 4-1 BB (CD137), GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3 or CD83 ligand.
  • an agonist e.g., an agonistic antibody or antigen- binding fragment thereof, or soluble fusion
  • OX40 e.g., an agonistic antibody or antigen- binding fragment thereof, or soluble fusion
  • CD2 e.g., an agonistic antibody or antigen- binding fragment thereof, or soluble fusion
  • ICAM-1 e.g.
  • the combination therapies disclosed herein include an immunomodulator that is a costimulatory molecule, e.g., an agonist associated with a positive signal that includes a costimulatory domain of CD28, CD27, ICOS and/or GITR.
  • an immunomodulator that is a costimulatory molecule, e.g., an agonist associated with a positive signal that includes a costimulatory domain of CD28, CD27, ICOS and/or GITR.
  • Exemplary GITR agonists include, e.g., GITR fusion proteins and anti-GITR antibodies (e.g., bivalent anti-GITR antibodies), such as, a GITR fusion protein described in U.S. Patent No.: 6,1 1 1 ,090, European Patent No.: 090505B1 , U.S Patent No.: 8,586,023, PCT Publication Nos.: WO 2010/0031 18 and 201 1/090754, or an anti-GITR antibody described, e.g., in U.S. Patent No.: 7,025,962, European Patent No.: 1947183B1 , U.S. Patent No.: 7,812,135, U.S.
  • anti-GITR antibodies e.g., bivalent anti-GITR antibodies
  • Patent No.: 8,388,967 U.S. Patent No.: 8,591 ,886, European Patent No.: EP 1866339, PCT Publication No.: WO 201 1/028683, PCT Publication No. :WO 2013/039954, PCT Publication No.: WO2005/007190, PCT Publication No.: WO
  • the immunomodulator used is a soluble ligand (e.g., a CTLA-4-lg), or an antibody or antibody fragment that binds to PD-L1 , PD-L2 or CTLA4.
  • the anti-PD-1 antibody molecule can be administered in combination with an anti- CTLA-4 antibody, e.g., ipilimumab, for example.
  • exemplary anti-CTLA4 antibodies include Tremelimumab (lgG2 monoclonal antibody available from Pfizer, formerly known as ticilimumab, CP-675,206); and Ipilimumab (CTLA-4 antibody, also known as MDX-010, CAS No. 477202-00-9).
  • an anti-PD-1 antibody molecule is administered after treatment with a compound of the invention as described herein.
  • an anti-PD-1 or PD-L1 antibody molecule is administered in combination with an anti-LAG-3 antibody or an antigen-binding fragment thereof.
  • the anti-PD-1 or PD-L1 antibody molecule is administered in combination with an anti-TIM-3 antibody or antigen-binding fragment thereof.
  • the anti-PD-1 or PD-L1 antibody molecule is administered in combination with an anti-LAG-3 antibody and an anti-TIM-3 antibody, or antigen-binding fragments thereof.
  • the combination of antibodies recited herein can be administered separately, e.g., as separate antibodies, or linked, e.g., as a bispecific or trispecific antibody molecule.
  • a bispecific antibody that includes an anti-PD-1 or PD-L1 antibody molecule and an anti-TIM-3 or anti-LAG-3 antibody, or antigen-binding fragment thereof, is administered.
  • the combination of antibodies recited herein is used to treat a cancer, e.g., a cancer as described herein (e.g., a solid tumor).
  • a cancer e.g., a cancer as described herein (e.g., a solid tumor).
  • the efficacy of the aforesaid combinations can be tested in animal models known in the art. For example, the animal models to test the synergistic effect of anti-PD-1 and anti-LAG-3 are described, e.g., in Woo et al. (2012) Cancer Res. 72(4):917-27).
  • immunomodulators that can be used in the combination therapies include, but are not limited to, e.g., afutuzumab (available from Roche®); pegfilgrastim (Neulasta®); lenalidomide (CC-5013, Revlimid®); thalidomide (Thalomid®), actimid (CC4047); and cytokines, e.g., IL-21 or IRX-2 (mixture of human cytokines including interleukin 1 , interleukin 2, and interferon ⁇ , CAS 951209-71 -5, available from IRX
  • Exemplary doses of such immunomodulators that can be used in combination with the antiviral compounds of the invention include a dose of anti-PD-1 antibody molecule of about 1 to 10 mg/kg, e.g., 3 mg/kg, and a dose of an anti-CTLA-4 antibody, e.g., ipilimumab, of about 3 mg/kg.
  • Examples of embodiments of the methods of using the antiviral compounds of the invention in combination with an immunomodulator include these, which may be used along with a compound of Formula I or any subgenus or species thereof that is disclosed herein:
  • a method to treat a viral infection in a subject comprising administering to the subject a compound of Formula (I) as described herein, and an immunomodulator.
  • the activator of the costimulatory molecule is an agonist of one or more of OX40, CD2, CD27, CDS, ICAM-1 , LFA-1 (CD1 1 a/CD18), ICOS (CD278), 4-1 BB (CD137), GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3 and CD83 ligand.
  • immunomodulator is an anti- PD-L1 antibody chosen from YW243.55.S70, MPDL3280A, MEDI-4736, MSB-0010718C, or MDX-1 105.
  • intravenously at a dose of about 1 to 30 mg/kg, e.g., about 5 to 25 mg/kg, about 10 to 20 mg/kg, about 1 to 5 mg/kg, or about 3 mg/kg., e.g., once a week to once every 2, 3, or 4 weeks.
  • xvi. The method of embodiment xv, wherein the anti-PD-1 antibody molecule, e.g., nivolumab, is administered intravenously at a dose from about 1 mg/kg to 3 mg/kg, e.g., about 1 mg/kg, 2 mg/kg or 3 mg/kg, every two weeks.
  • the anti-PD-1 antibody molecule e.g., nivolumab
  • xvii The method of embodiment xv, wherein the anti-PD-1 antibody molecule, e.g., nivolumab, is administered intravenously at a dose of about 2 mg/kg at 3-week intervals.
  • the anti-PD-1 antibody molecule e.g., nivolumab
  • the starting 5-bromo-pyridin-3-ol can be chlorinated with basic hypochlorite, and alkylated to introduce R 11 using conventional methods.
  • a desired R 3 group can then be installed by known methods, such as alkoxide displacement to introduce an alkoxy group. Examples herein illustrate coupling of the bromopyridine intermediate with a ketone in the presence of base and a Pd catalyst complex; this method can be used to introduce a cyclic or acyclic ketone as desired.
  • the carbonyl is then converted to a protected amine via reductive amination, for example; protection with a tBoc (tert-butoxycarbonyl) group allows subsequent bromination and metalation to introduce a formyl group on the pyridine ring as shown.
  • tBoc tert-butoxycarbonyl
  • cyclization occurs to produce the cyclic imine.
  • This imine moiety condenses with ethyl (E)-2-(ethoxymethylene)-3-oxobutanoate upon heating in ethanol to form the final ring, which is then oxidized with chloranil upon heating in DME followed by hydrolysis to provide a compound of Formula (I).
  • Scheme 2 depicts a method to produce the isomeric pyridine compounds, starting with available 2-iodo-6-bromopyridines having a desired R 3 group, such as methoxy. After using the bromo substituent to introduce a desired R 4 group such as -OR 11 , the remaining steps are similar to those described for Scheme 1 .
  • a readily removable group that is not a constituent of the particular desired end product of the compounds of the present invention is designated a "protecting group,” unless the context indicates otherwise.
  • the protection of functional groups by such protecting groups, the protecting groups themselves, and their cleavage reactions are described for example in standard reference works, such as e.g., Science of Synthesis: Houben-Weyl Methods of Molecular Transformation. Georg Thieme Verlag, Stuttgart, Germany. 2005. 41627 pp. (URL: http://www.science-of-synthesis.com (Electronic Version, 48 Volumes)); J. F. W. McOmie, "Protective Groups in Organic Chemistry", Plenum Press, London and New York 1973, in T. W. Greene and P.
  • Salts of compounds of the present invention having at least one salt-forming group may be prepared in a manner known per se.
  • salts of compounds of the present invention having acid groups may be formed, for example, by treating the compounds with metal compounds, such as alkali metal salts of suitable organic carboxylic acids, e.g., the sodium salt of 2-ethyl hexanoic acid, with organic alkali metal or alkaline earth metal compounds, such as the corresponding hydroxides, carbonates or hydrogen carbonates, such as sodium or potassium hydroxide, carbonate or hydrogen carbonate, with corresponding calcium compounds or with ammonia or a suitable organic amine, stoichiometric amounts or only a small excess of the salt-forming agent preferably being used.
  • metal compounds such as alkali metal salts of suitable organic carboxylic acids, e.g., the sodium salt of 2-ethyl hexanoic acid
  • organic alkali metal or alkaline earth metal compounds such as the corresponding hydroxides, carbonates or hydrogen carbonates
  • Acid addition salts of compounds of the present invention are obtained in customary manner, e.g., by treating the compounds with an acid or a suitable anion exchange reagent.
  • Internal salts of compounds of the present invention containing acid and basic salt-forming groups, e.g., a free carboxy group and a free amino group, may be formed, e.g., by the neutralization of salts, such as acid addition salts, to the isoelectric point, e.g., with weak bases, or by treatment with ion exchangers.
  • Salts can be converted in customary manner into the free compounds; metal and ammonium salts can be converted, for example, by treatment with suitable acids, and acid addition salts, for example, by treatment with a suitable basic agent.
  • Mass spectra were run on LC-MS systems using electrospray ionization. These were WATERS Acquity Single Quard Detector. [M+H] + refers to mono-isotopic molecular weights.
  • NMR spectra were run on open access Varian 400 or Varian 500 NMR spectrometers. Spectra were measured at 298K and were referenced using the solvent peak. Chemical shifts for 1 H NMR are reported in parts per million (ppm). [00167] Mass spectra were run on LC-MS systems with one of the following conditions:
  • Example 1.1 3-methoxy-2-(3-methoxypropoxy)-10, 10-dimethyl-6-oxo-6, 9a, 10, 11, 12, 12a- hexahydrocyclopenta[h]pyrido[2, 1-f][ 1, 6]naphthyridine-7-carboxylic acid [1.1]
  • Step 2 5-(5-methoxy-6-(3-methoxypropoxy)pyridin-2-yl)-2,2-dimethylcyclopentan-1-one [1.1b]
  • Step 3 tert-butyl (5-(3-bromo-5-methoxy-6-(3-methoxypropoxy)pyridin-2-yl)-2,2- dimethylcyclopentyl)carbama
  • Step 4 3-methoxy-2-(3-methoxypropoxy)-7, 7-dimethyl-6a,8,9,9a-tetrahydro-7H- cyclopenta[h][1 , 6]naphthyridine [rac-1.1d-l and rac-1.1d-ll]
  • Step 5 ethyl 3-methoxy-2-(3-methoxypropoxy)-10, 10-dimethyl-6-oxo-6,9a, 10, 11, 12, 12a- hexahydrocyclopenta[h]pyrido[2, 1-f][ 1, 6]naphthyridine-7-carboxylate [1.1e]
  • Step 6 (3-methoxy-2-(3-methoxypropoxy)-10, 10-dimethyl-6-oxo-6,9a, 10, 11, 12, 12a- hexahydrocyclopenta[h]pyrido[2, 1-fJ[ 1, 6]naphthyridine-7-carboxylic acid [ 1.1-1] and [ 1.1-11]
  • Example 1.2 6-isopropyl-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10-dihydro-6H- pyrido[2, 1-fJ[1,6]naphthyridine-9-carboxylic acid [1.2]
  • Step 2 tert-butyl (1-(3-bromo-5-methoxy-6-(3-methoxypropoxy)pyridin-2-yl)-3-methylbutan- 2-yl)carbamate [1.2b]
  • Step 3 7-isopropyl-3-methoxy- -(3-methoxypropoxy)-7,8-dihydro-1, 6-naphthyridine [1.2c]
  • the mixture was partitioned between EtOAc (15 mL) and sat aq. NH 4 CI solution (5 mL). The layers were separated, and the aqueous layer extracted with EtOAc. The combined organic layers were dried over Na 2 S0 4 , filter and concentrate. The remaining material was dissolved in DCM (3 mL) and TFA (3 mL). The reaction was judged complete by LC-MS after 15 min, and the volatiles were removed in vacuo. The resulting oil was dissolved in EtOAc and water, and the pH adjusted to 1 1 with NH 4 OH. The layers were separated. The aqueous layer was extracted twice more with EtOAc. The combined organic layers were dried over Na 2 S0 4 , filtered and concentrated onto diatomaceous earth.
  • Step 4 ethyl 6-isopropyl-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10-dihydro-6H- pyrido[2, 1 -fj[1 ,6]naphthyridine-9-carboxylate [1.2d]
  • Step 5 6-isopropyl-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10-dihydro-6H-pyrido[2, 1- fJ[1, 6]naphthyridine-9-carboxylic acid [1.2]
  • NBS (0.494 g, 2.77 mmol) was added to a solution of 2.1 f (1 .0g, 2.52 mmol) in CH 3 CN (10.0 ml) and the resulting mixture was stirred at rt for 3 h. The mixture was then added to water and extracted with EtOAc. The organic layer was washed with aq. NaOH solution (2.0 N), dried over Na 2 S0 4 and concentrated to give product (0.8g, 67% yield).
  • Step 8 tert-butyl (1-(2-formyl-6-methoxy-5-(3-methoxypropoxy)pyridin-3-yl)-3,3- dimethylbutan-2-yl)carbama
  • n-Buli (2.5 M in hexane, 2.7 ml_, 6.73 mmol) was added to a solution of 2.1 g (0.8 g 1 .68 mmol) in THF(10.0 ml) at -78 °C. After 1 h, DMF (0.615 g 8.42 mmol) was added dropwise and the resulting mixture was stirred at -78 °C for 4 h. The mixture was then added to sat. aq. NH 4 CI solution and extracted with EtOAc. The organic layer was dried over Na 2 S0 4 and concentrated to give product 2.1 h (0.6g, 84% yield).
  • Step 9 Preparation of 6-(tert-butyl)-2-methoxy-3-(3-methoxypropoxy)-5, 6-dihydro-1, 7- naphthyridine [2.1i]
  • TFA (0.3 ml_, 40.3 mmol) was added to a solution of 2.1 h (0.6 g, 1 .42 mmol) in DCM (6.0 ml_) and the solution was stirred at rt for 2 h. The mixture was then added into water and extracted with DCM. The organic layer was dried over Na 2 S0 4 and
  • Step 10 ethyl 6-(tert-butyl)-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10, 11 , 11a- tetrahydro-6H-pyrido[1 ,2
  • Step 11 ethyl 6-(tert-butyl)-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10-dihydro-6H- pyrido[1,2-h][1, 7]naphthyridine-9-carboxylate [2.1k]
  • Step 12 6-(tert-butyl)-2-methoxy-3-(3-methoxypropoxy)-10-oxo-5, 10-dihydro-6H-pyrido[1,2- h][1, 7]naphthyridine-9-carboxylic acid [2.1]
  • NBS (1 .43 g, 8.08) was added to a solution of 2.2d (3.0 g, 7.35 mmol, 1 .0 eq) in CH 3 CN and the resulting solution was stirred at rt 3 h. The mixture was then added to water and extracted with EtOAc. The organic layer was washed with aq. NaOH (2.0 N) solution, dried over sodium sulfate and concentrated. The crude material was purified by silica gel column chromatography, evaporated under vacuum to get crude material.
  • Ethyl (Z)-2-(ethoxymethylene)-3-oxobutanoate (281 mg, 1 .507 mmol) was added to a solution of 2.2e-ll (160 mg, 0.50 mmol) in EtOH (1 .0 ml_). The vial was then sealed and heated at 1 10 °C for 18 h. After cooling to rt, the solvent was removed under vacuum. The residue was dissolved in DME (1 .0 ml_) and p-chloranil (148 mg, 0.603 mmol) was added. The vial was sealed and heated at 100 °C for 1 h. The mixture was concentrated and the residue was purified by silica gel column chromatography,
  • Step 8 2-methoxy-3-(3-methoxypropoxy)-7, 7-dimethyl-11-oxo-4b, 5, 6, 7, 7a, 11- hexahydrocyclopenta[f]pyrido[1 ,2-h][1 , 7]naphthyridine-10-carboxylic acid [2.2-111] and [2.2- IV]
  • Racemic mixtures of 2.2-IM and 2.2-IV were synthesized following the procedures described for example 2.2f using 2.2d-l. The product was separated by chiral
  • Compounds 2.2-1, 2.2-11, 2.2-IM and 2.2-IV represent separated enantiomers of the cis and trans isomers of compound 2.2, and there specific stereochemistries have not been unambiguously determined. As shown below, however, all are active in the biochemical assay disclosed herein.
  • Step 1 ethyl 12-fluoro-2-methoxy-3-(3-methoxypropoxy)-7, 7-dimethyl-11 -oxo- 4b,5,6, 7, 7a, 11-hexahydrocyclopenta[fjpyrido[1,2-h][1, 7]naphthyridine-10-carboxylate [2.3a]
  • Step 2 12-fluoro-2-methoxy-3-(3-methoxypropoxy)-7, 7-dimethyl-11 -oxo-4b, 5, 6, 7, 7a, 11- hexahydrocyclopenta[fjpyrido[1 ,2-h][1 , 7]naphthyridine-10-carboxylic acid [2.3]
  • Step-6 tert-butyl (5-(3-bromo-5,6-dimethoxypyrazin-2-yl)-2,2-dimethyl cyclopentyl) carbamate [4.1fj
  • N-bromosuccinimide (1 .78 g, 5.08 mmol) was added to a solution of 4.1 e (3.2 g, 9.1 1 mmol) in CH 3 CN (32 ml_) under nitrogen atmosphere and the reaction mixture was stirred at rt for 45 minutes. The reaction mixture was then diluted with water (100 ml_) and extracted with EtOAc. The combined organic layers were washed with brine, dried over Na 2 S0 4 and concentrated to give product (3.8 g). LCMS (m/z): 431 .0 [M+H] + .
  • Step-7 tert-butyl (5-(5,6-dimethoxy-3-vinylpyrazin-2-yl)-2,2-dimethyl cyclopentyl) carbamate [4.1g]
  • Step-8 tert-butyl(5-(3-formyl-5, 6-dimethoxypyrazin-2-yl)-2, 2-dimethyl cyclopentyl) carbamate [4.1h]
  • Step-9. 2 3-dimethoxy-7, 7-dimethyl-6a, 8, 9, 9a-tetrahydro-7H-cyclopenta[5, 6]pyrido[3, 4-b] [4. H]
  • R 1 is H or F
  • Z 1 and Z 2 are each selected from N and CH, provided that at least one of Z 1 and Z 2 is N.
  • HepG2-Clone42 a Tet-inducible HBV-expressing cell line with a stably integrated 1 .3mer copy of the HBV ayw strain, was generated based on the Tet-inducible HepAD38 cell line with slight modifications.
  • Ladner SK et al., Antimicrobial Agents and Chemotherapy. 41 (8):1715-1720 (1997).
  • HepG2-Clone42 cells were cultured in DMEM/F- 12 + GlutamaxTM (Life Technologies, Carlsbad, CA, USA), supplemented with 10% fetal bovine serum (Life Technologies), G-418 (Corning, Manassas, VA, USA) at a final concentration of 0.5 mg/mL, and 5 ⁇ g/mL Doxycycline (Sigma, St. Louis, MO, USA) and maintained in 5% C0 2 at 37°C.
  • HepG2-Clone42 cells were seeded in into black clear-bottom 96-well plates at a concentration of 6.0 x 10 4 cells/well. 24 hours post-seeding, the cells were treated with 200 ⁇ /well of media containing five-fold serial dilutions of compounds in DMSO. DMSO alone was used as the no drug control. The final DMSO concentration in all wells was 0.5%.
  • the HBsAg ELISA kit (Alpha Diagnostic International, San Antonio, TX, USE, Catalog # 41 10) was used to determine the level (semi-quantitative) of secreted HBV sAg.
  • the HBSAg ELISA assay was performed following the manufacturer's protocol as described.
  • Step 1 Pipet 100 ⁇ each of compound or DMSO treated samples into HBsAg ELISA plates. Seal plates and incubate at room temp for 60 minutes.
  • Step 2 Aspirate samples and wash three times with Wash Buffer. Dispense 100 ⁇ of antibody-HRP conjugate to each well. Incubate at room temp for 30 minutes.
  • Step 4 Dispense 100 of Stop Solution to each well. Measure absorbance of ELISA plate at 450 nm.
  • Dose-response curves were generated and the EC 50 value was defined as the compound concentration at which HBsAg secretion was reduced 50% compared to the DMSO control.
  • X c is the absorbance signal from compound-treated well
  • M B is average absorbance signal (background signal) for column 12 (no cells + HBsAg ELISA sample buffer)
  • M D is average absorbance signal from DMSO-treated wells. Then calculate EC 50 values by non-linear regression using a four parameter curve logistic equation.
  • EC 50 in the HBsAg assay was 550 nM.
  • EC 50 in the HBsAg assay was 0.8 nM
  • EC 50 in the HBsAg assay was 1 1 nM.
  • EC 50 in the HBsAg assay was 0.3 nM
  • EC 50 in the HBsAg assay was 0.5 nM.
  • EC 50 in the HBsAg assay was 5.0 nM
  • EC 50 in the HBsAg assay was 43.6 nM
  • EC 50 in the HBsAg assay was 20.0 nM
  • EC 50 in the HBsAg assay was 20 nM.
  • EC 50 in the HBsAg assay was 0.7 nM.
  • EC 50 in the HBsAg assay was 83 nM.
  • EC 50 in the HBsAg assay was 193 nM.

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Abstract

L'invention concerne des composés de formule (I) tels que décrits dans la description, ainsi que des sels pharmaceutiquement acceptables, des compositions pharmaceutiques contenant de tels composés, et des méthodes d'utilisation de ces composés, sels et compositions pour traiter des infections virales, notamment des infections causées par le virus de l'hépatite B, et pour réduire l'apparition de troubles graves associés au VHB.
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