US20230287004A1 - Substituted polycyclic pyridone derivatives and prodrugs thereof - Google Patents

Substituted polycyclic pyridone derivatives and prodrugs thereof Download PDF

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US20230287004A1
US20230287004A1 US18/080,247 US202218080247A US2023287004A1 US 20230287004 A1 US20230287004 A1 US 20230287004A1 US 202218080247 A US202218080247 A US 202218080247A US 2023287004 A1 US2023287004 A1 US 2023287004A1
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compound
optionally substituted
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esi
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Makoto Kawai
Kenji Tomita
Toshiyuki Akiyama
Azusa OKANO
Masayoshi Miyagawa
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Shionogi and Co Ltd
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Shionogi and Co Ltd
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Priority claimed from PCT/JP2016/063139 external-priority patent/WO2016175224A1/ja
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Definitions

  • This invention relates to substituted polycyclic pyridone derivatives having cap-dependent endonuclease inhibitory activity, prodrugs thereof, and pharmaceutical compositions including thereof.
  • Influenza is an acute respiratory infectious disease caused by infection with an influenza virus. In Japan, millions of influenza-like patients are reported every winter, and influenza is accompanied with high morbidity and mortality. Influenza is a particularly important disease in a high risk population such as baby and elderly, a complication rate with pneumonia is high in elderly, and death with influenza is occupied with elderly in many cases.
  • a cap-dependent endonuclease which is an influenza virus-derived enzyme is essential for virus proliferation, and has the virus-specific enzymatic activity which is not possessed by a host, it is believed that the endonuclease is suitable for a target of an anti-influenza drug.
  • the cap-dependent endonuclease of an influenza virus has a host mRNA precursor as a substrate, and has the endonuclease activity of producing a fragment of 9 to 13 bases including a cap structure (not including the number of bases of the cap structure). This fragment functions as a primer of a virus RNA polymerase, and is used in synthesizing mRNA encoding a virus protein. That is, it is believed that a substance which inhibits the cap-dependent endonuclease inhibits synthesis of a virus protein by inhibiting synthesis of virus mRNA and, as a result, inhibits virus proliferation.
  • Patent Document 1 and Non-Patent Documents 1 and 2 As the substance which inhibits the cap-dependent endonuclease, flutimide (Patent Document 1 and Non-Patent Documents 1 and 2), 4-substituted 2,4-dioxobutanoic acid (Patent Document 2 and Non-Patent Documents 3 and 4), the compounds described in Patent Documents 3 to 12 and the like have been reported, but they have not yet led to clinical use as anti-influenza drugs.
  • Patent Documents 9 and 12 describe compounds having a similar structure to that of this invention, but does not describe the compounds relating to the present invention.
  • Patent Documents 13 to 15 describe compounds having a similar structure to that of this invention as a compound having integrase inhibitory activity, however, the documents do not describe cap-dependent endonuclease.
  • Patent Document 16 and 17 describes an invention relating to compounds having a similar structure to that of this invention as a compound having cap-dependent endonuclease inhibitory activity, which has been filed by the applicants, but does not describe the compounds relating to the present invention.
  • An object of the present invention is to provide compounds having antiviral activities, especially inhibiting growth activity of influenza virus.
  • Another object of the present invention is to provide a prodrug prepared from compounds used for in vivo administration (for example, oral administration), being efficiently absorbed into the body after administration and showing high pharmacological effect.
  • the present invention provides inventions shown below.
  • R 2 , R 3 , R 4 and R 5 are each independently hydrogen or fluorine; the number of fluorine atoms of R 2 , R 3 , R 4 and R 5 is 1 or 2, or its pharmaceutically acceptable salt.
  • each definition has the same meaning as described in claim 1 , or its pharmaceutically acceptable salt.
  • P is hydrogen or a group P R to form a prodrug, or its pharmaceutically acceptable salt.
  • the present invention further provides a method for treating or preventing influenza infectious disease using the prodrug compound and the compound which exhibits anti influenza activity.
  • the present invention further provides a parent compound of the prodrug compound.
  • the parent compound is effective as an anti-influenza agent or an intermediate of the prodrug compound.
  • the compound according to the present invention has an inhibitory activity on cap-dependent endonuclease. More preferred compound is a prodrug, and the prodrug becomes a parent compound having an inhibitory activity on cap-dependent endonuclease in vivo after administration, thus is effective as a therapeutic agent and/or preventive agent for influenza infectious disease.
  • FIG. 1 is a result of measuring the plasma concentration of compound 111-2, after oral administration of prodrug Compound 11-6, the parent compound of which is Compound 111-2, to rat under non-fasting conditions.
  • FIG. 2 is a result of measuring the plasma concentration of compound 11-6, after oral administration of prodrug Compound 11-6, the parent compound of which is Compound 111-2, to rat under non-fasting conditions.
  • Optionally substituted by substituent group A means that an arbitrary position may be substituted by one, two or more same or different substituents selected from substituent group A.
  • Prodrug in the present description refers to a compound represented by formula (II) in the following reaction formula:
  • the prodrug more preferably means a compound in which bioavailability and/or AUC (area under the blood concentration curve) in in vivo administration is improved more than those of the compound represented by formula (III).
  • the prodrug is efficiently absorbed into the body in the stomach and/or intestines after in vivo administration (for example, oral administration), then converted into the compound represented by formula (III).
  • the prodrug preferably shows an effect of treating and/or preventing influenza higher than the compound represented by formula (III).
  • R 2 , R 3 , R 4 and R 5 are each independently hydrogen or fluorine; the number of fluorine atoms of R 2 , R 3 , R 4 and R 5 is 1 or 2.
  • Group P R to form a prodrug in the present description refers to a “P R ” group in the formula (II), in the following reaction formula:
  • the “group P R to form a prodrug” more preferably means a group that improves bioavailability and/or AUC (area under the blood concentration curve) of the compound represented by formula (III) by being added to the compound represented by formula (III).
  • Examples of the group P R to form a prodrug include the groups described in Prog. Med. 5: 2157-2161 (1985) and Supplied by The British Library—“The world's Knowledge”.
  • the “P R ” group in —OP R group in the formula (I) or (II) may be a group converted into —OH group in vivo, and examples preferably include a group selected from the following formulae a) to ac).
  • the group P R to form a prodrug is preferably a group selected from the followings.
  • Parenter compound in the present description means a compound to be a source before synthesizing the “prodrug” and/or a compound released from the “prodrug” by the reaction by enzymes, a gastric acid, and the like under physiological conditions in vivo, and specifically means a compound shown by the formula (III), or pharmaceutically acceptable salt thereof or a solvate thereof.
  • halogen includes a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
  • a fluorine atom and a chlorine atom are especially preferable.
  • alkyl includes a C1 to C15, preferably C1 to C10, more preferably C1 to C6 and further preferably C1 to C4 linear or branched hydrocarbon group. Examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, isohexyl, n-heptyl, isoheptyl, n-octyl, isooctyl, n-nonyl, n-decyl and the like.
  • alkyl is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl or n-pentyl.
  • a more preferred embodiment is methyl, ethyl, n-propyl, isopropyl or tert-butyl.
  • alkenyl includes a C2 to C15, preferably a C2 to C10, more preferably a C2 to C6 and further preferably a C2 to C4 linear or branched hydrocarbon group having one or more double bond(s) at any position(s).
  • Examples include vinyl, allyl, propenyl, isopropenyl, butenyl, isobutenyl, prenyl, butadienyl, pentenyl, isopentenyl, pentadienyl, hexenyl, isohexenyl, hexadienyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl and the like.
  • alkenyl is vinyl, allyl, propenyl, isopropenyl or butenyl.
  • alkylene includes a C1 to C15, preferably a C1 to C10, more preferably a C1 to C6 and further preferably a C1 to C4 liner or branched bivalent hydrocarbon group. Examples include methylene, ethylene, trimethylene, propylene, tetramethylene, pentamethylene, hexamethylene and the like.
  • alkenylene includes a C2 to C15, preferably a C2 to C10, more preferably a C2 to C6 and further preferably a C2 to C4 liner or branched bivalent hydrocarbon group having one or more double bond(s) at any position(s). Examples include vinylene, prenylene, butenylene, pentenylene and the like.
  • hydroxyalkyl means a group wherein one or more hydroxyl group(s) is replaced with hydrogen atom(s) attached to a carbon atom(s) of the above “alkyl”. Examples include hydroxymethyl, 1-hydroxyethyl, 2-hydroxyethyl, 1-hydroxypropyl, 2-hydroxypropyl, 1,2-hydroxyethyl and the like.
  • hydroxyalkyl is hydroxymethyl
  • alkyloxy means a group wherein the above “alkyl” is bonded to an oxygen atom. Examples include methyloxy, ethyloxy, n-propyloxy, isopropyloxy, n-butyloxy, tert-butyloxy, isobutyloxy, sec-butyloxy, pentyloxy, isopentyloxy, hexyloxy and the like.
  • alkyloxy is methyloxy, ethyloxy, n-propyloxy, isopropyloxy or tert-butyloxy.
  • haloalkyl means a group wherein one or more “halogen” described above is bonded to the above “alkyl”. Examples include monofluoromethyl, monofluoroethyl, monofluoropropyl, 2,2,3,3,3-pentafluoropropyl, monochloromethyl, trifluoromethyl, trichloromethyl, 2,2,2-trifluoroethyl, 2,2,2-trichloroethyl, 1,2-dibromoethyl, 1,1,1-trifluoropropan-2-yl and the like.
  • haloalkyl is trifluoromethyl or trichloromethyl.
  • alkylcarbonyl means a group wherein the above “alkyl” is bonded to a carbonyl group. Examples include methylcarbonyl, ethylcarbonyl, propylcarbonyl, isopropylcarbonyl, tert-butylcarbonyl, isobutylcarbonyl, sec-butylcarbonyl, penthylcarbonyl, isopenthylcarbonyl, hexylcarbonyl and the like.
  • alkylcarbonyl is methylcarbonyl, ethylcarbonyl or n-propylcarbonyl.
  • alkylamino means a group wherein one or two hydrogen atom(s) attached to a nitrogen atom of an amino group is replaced with the above “alkyl”.
  • Two alkyl groups may be the same or different. Examples include methylamino, ethylamino, isopropylamino, dimethylamino, diethylamino, N,N-diisopropylamino, N-methyl-N-ethylamino, N-isopropyl-N-ethylamino and the like.
  • alkylamino is methylamino, ethylamino, dimethylamino or diethylamino.
  • alkylaminoalkyl means a group wherein the above “alkylamino” is bonded to the above “alkyl”.
  • alkylaminocarbonyl means a group wherein the above “alkylamino” is bonded to a carbonyl group.
  • alkylaminocarbonyloxy means a group wherein the above “alkylaminocarbonyl” is bonded to an oxygen atom.
  • alkylcarbonylamino means a group wherein the above “alkylcarbonyl” is replaced with a hydrogen atom bonded to a nitrogen atom of an amino group. Examples include methylcarbonylamino, ethylcarbonylamino, propylcarbonylamino, isopropylcarbonylamino, tert-butylcarbonylamino, isobutylcarbonylamino, sec-butylcarbonylamino and the like.
  • alkylcarbonylamino is methylcarbonylamino or ethylcarbonylamino.
  • alkylcarbonyloxy means a group wherein the above “alkylcarbonyl” is bonded to an oxygen atom. Examples include methylcarbonyloxy, ethylcarbonyloxy, propylcarbonyloxy, isopropylcarbonyloxy, tert-butylcarbonyloxy, isobutylcarbonyloxy, sec-butylcarbonyloxy and the like.
  • alkylcarbonyloxy is methylcarbonyloxy or ethylcarbonyloxy.
  • alkylcarbonylaminoalkyl means a group wherein the above “alkylcarbonylamino” is bonded to the above “alkyl”.
  • alkyloxycarbonyl means a group wherein the above “alkyloxy” is bonded to a carbonyl group. Examples include methyloxycarbonyl, ethyloxycarbonyl, propyloxycarbonyl, isopropyloxycarbonyl, tert-butyloxycarbonyl, isobutyloxycarbonyl, sec-butyloxycarbonyl, penthyloxycarbonyl, isopenthyloxycarbonyl, hexyloxycarbonyl and the like.
  • alkyloxycarbonyl is methyloxycarbonyl, ethyloxycarbonyl or propyloxycarbonyl.
  • alkyloxycarbonylalkyl means a group wherein the above “alkyloxycarbonyl” is bonded to the above “alkyl”.
  • alkyloxycarbonyloxy means a group wherein the above “alkyloxycarbonyl” is bonded to an oxygen atom.
  • alkylsulfanyl means a group wherein the above “alkyl” is replaced with a hydrogen atom bonded to a sulfur atom of a sulfanyl group. Examples include methylsulfanyl, ethylsulfanyl, n-propylsulfanyl, isopropylsulfanyl and the like.
  • alkylsulfonyl means a group wherein the above “alkyl” is bonded to a sulfonyl group. Examples include methylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, tert-butylsulfonyl, isobutylsulfonyl, sec-butylsulfonyl and the like.
  • alkylsulfonyl is methylsulfonyl or ethylsulfonyl.
  • titanium alkylsilyl means a group wherein three of the above “alkyl” are bonded to a silicon atom. Three alkyl groups may be the same or different. Examples include trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl and the like.
  • Carbocyclyl group means C3 to C20 preferably C3 to C16, more preferably C4 to C12 cyclic hydrocarbon group and includes aromatic carbocyclyl and non-aromatic carbocyclyl.
  • aromatic carbocyclyl means a cyclic aromatic hydrocarbon group which is monocyclic or polycyclic having two or more rings. Examples include phenyl, naphthyl, anthryl, phenanthryl and the like.
  • aromatic carbocyclyl is phenyl, 1-naphthyl or 2-naphthyl. Another embodiment of “aromatic carbocyclyl” is phenyl,
  • non-aromatic carbocyclyl means a cyclic saturated hydrocarbon group or a cyclic unsaturated non-aromatic hydrocarbon group, which is monocyclic or polycyclic having two or more rings.
  • non-aromatic carbocyclyl which is polycyclic having two or more rings, include a fused ring group wherein a non-aromatic carbocyclyl, which is monocyclic or polycyclic having two or more rings, is fused with a ring of the above “aromatic carbocyclyl”.
  • non-aromatic carbocyclyl also include a group having a bridge or a group to form a spiro ring as follows:
  • the non-aromatic carbocyclyl which is monocyclic is preferably C3 to C16, more preferably C3 to C12 and further preferably C3 to C8 carbocyclyl.
  • Examples include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclohexadienyl and the like.
  • non-aromatic carbocyclyl which is polycyclic having two or more rings, include indanyl, indenyl, acenaphthyl, tetrahydronaphthyl, fluorenyl and the like.
  • carrier means C3 to C20 preferably C3 to C16, more preferably C4 to C12 cyclic hydrocarbon and includes aromatic carbocycle and non-aromatic carbocycle.
  • aromatic carbocycle means a cyclic aromatic hydrocarbon which is monocyclic or polycyclic having two or more rings. Examples include benzene ring, naphthalene ring, anthracene ring, phenanthrene ring and the like.
  • aromatic carbocycle A preferred embodiment of “aromatic carbocycle” is benzene ring and naphthalene ring are exemplified. Another embodiment of “aromatic carbocycle” is benzene ring.
  • non-aromatic carbocycle means a saturated carbocycle or an unsaturated non-aromatic carbocycle which is monocyclic or polycyclic having two or more rings.
  • non-aromatic carbocycle which is polycyclic having two or more rings, include a fused ring wherein a non-aromatic carbocycle, which is monocyclic or polycyclic having two or more rings, is fused with a ring of the above “aromatic carbocycle”.
  • non-aromatic carbocycle also include a cycle having a bridge or a cycle to form a spiro ring as follows:
  • the non-aromatic carbocycle which is monocyclic is preferably C3 to C16, more preferably C3 to C12 and further preferably C3 to C8 carbocycle.
  • Examples include cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclononane, cyclodecane, cyclopropene, cyclobutene, cyclopentene, cyclohexene, cycloheptene, cyclohexadiene and the like.
  • non-aromatic carbocycle which is polycyclic having two or more rings
  • examples of non-aromatic carbocycle include indane, indene, acenaphthalene, tetrahydronaphthalene, fluorine and the like are exemplified.
  • heterocyclyl group includes an aromatic cyclyl and a non-aromatic heterocyclyl, which is containing one or more of heteroatom(s) selected independently from O, S and N.
  • aromatic heterocyclyl means an aromatic cyclyl, which is monocyclic or polycyclic having two or more rings, containing one or more of heteroatom(s) selected independently from O, S and N.
  • aromatic heterocyclyl which is polycyclic having two or more rings, include a fused ring group wherein an aromatic heterocyclyl, which is monocyclic or polycyclic having two or more rings, is fused with a ring of the above “aromatic carbocyclyl”.
  • the aromatic heterocyclyl which is monocyclic, is preferably a 5- to 8-membered and more preferably 5- to 6-membered ring.
  • Examples include pyrrolyl, imidazolyl, pyrazolyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazolyl, triazinyl, tetrazolyl, furyl, thienyl, isoxazolyl, oxazolyl, oxadiazolyl, isothiazolyl, thiazolyl, thiadiazolyl and the like.
  • aromatic heterocyclyl which is bicyclic, include indolyl, isoindolyl, indazolyl, indolizinyl, quinolinyl, isoquinolinyl, cinnolinyl, phthalazinyl, quinazolinyl, naphthyridinyl, quinoxalinyl, purinyl, pteridinyl, benzimidazolyl, benzisoxazolyl, benzoxazolyl, benzoxadiazolyl, benzisothiazolyl, benzothiazolyl, benzothiadiazolyl, benzofuryl, isobenzofuryl, benzothienyl, benzotriazolyl, imidazopyridyl, triazolopyridyl, imidazothiazolyl, pyrazinopyridazinyl, oxazolopyridyl, thiazolopyridyl and the like.
  • aromatic heterocyclyl which is polycyclic having three or more rings, include carbazolyl, acridinyl, xanthenyl, phenothiazinyl, phenoxathiinyl, phenoxazinyl, dibenzofuryl and the like.
  • non-aromatic heterocyclyl means a non-aromatic cyclyl, which is monocyclic or polycyclic having two or more rings, containing one or more heteroatom(s) selected independently from O, S and N.
  • non-aromatic heterocyclyl which is polycyclic having two or more rings, include a fused ring group wherein a non-aromatic heterocycle, which is monocyclic or polycyclic having two or more ring(s), is fused with a ring of the above “aromatic carbocyclyl”, “non-aromatic carbocyclyl” and/or “aromatic heterocyclyl”.
  • non-aromatic heterocyclyl also include a group having a bridge or a group to form a Spiro ring as follows:
  • the non-aromatic heterocyclyl which is monocyclic, is preferably a 3- to 8-membered and more preferably 5- to 6-membered ring.
  • Examples include dioxanyl, thiiranyl, oxiranyl, oxetanyl, oxathiolanyl, azetidinyl, thianyl, thiazolidinyl, pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, piperidinyl, piperazinyl, morpholinyl, morpholino, thiomorpholinyl, thiomorpholino, dihydropyridinyl, tetrahydropyridinyl, tetrahydrofuryl, tetrahydropyranyl, dihydrothiazolinyl, tetrahydrothiazolinyl, t
  • non-aromatic heterocyclyl which is polycyclic having two or more rings
  • examples of non-aromatic heterocyclyl include indolinyl, isoindolinyl, chromanyl, isochromanyl and the like.
  • heterocycle includes an aromatic cycle and a non-aromatic heterocycle, which is containing one or more of heteroatom(s) selected independently from O, S and N.
  • aromatic heterocycle means an aromatic cycle which is monocyclic or polycyclic having two or more rings, containing one or more of heteroatom(s) selected independently from O, S and N.
  • aromatic heterocycle which is polycyclic having two or more rings, include a fused ring wherein an aromatic heterocycle, which is monocyclic or polycyclic having two or more rings, is fused with a ring of the above “aromatic carbocycle”.
  • the aromatic heterocycle which is monocyclic, is preferably a 5- to 8-membered and more preferably 5- to 6-membered ring.
  • Examples include pyrrole, imidazole, pyrazole, pyridine, pyridazine, pyrimidine, pyrazine, triazole, triazine, tetrazole, furan, thiophene, isoxazole, oxazole, oxadiazole, isothiazole, thiazole, thiadiazole and the like.
  • aromatic heterocycle which is bicyclic, include indoline, isoindoline, indazorin, indolizine, quinoline, isoquinoline, cinnoline, phthalazine, quinazoline, naphthyridine, quinoxaline, purine, pteridine, benzimidazole, benzisoxazole, benzoxazole, benzoxadiazole, benzisothiazole, benzothiazole, benzothiadiazole, benzofuran, isobenzofuran, benzothiophene, benzotriazole, imidazopyridine, triazolopyridine, imidazothiazole, pyrazinopyridazine, oxazolopyridine, thiazolopyridine and the like.
  • aromatic heterocycle which is polycyclic having three or more rings, include carbazole, acridine, xanthene, phenothiazine, phenoxathiin, phenoxazine, dibenzofuran and the like.
  • non-aromatic heterocycle means a non-aromatic cycle, which is monocyclic or polycyclic having two or more rings, containing one or more of heteroatom(s) selected independently from O, S and N.
  • non-aromatic heterocycle which is polycyclic having two or more rings, include a fused ling wherein a non-aromatic heterocycle, which is monocyclic or polycyclic having two or more ring(s), is fused with a ring of the above “aromatic carbocycle”, “non-aromatic carbocycle” and/or “aromatic heterocycle”.
  • non-aromatic heterocycle also include a cycle having a bridge or a cycle to form a spiro ring as follows:
  • the non-aromatic heterocycle which is monocyclic, is preferably a 3- to 8-membered and more preferably 5- to 6-membered ring.
  • Examples include dioxane, thiirane, oxirane, oxetane, oxathiolane, azetidine, thiane, thiazolidine, pyrrolidine, pyrroline, imidazolidine, imidazoline, pyrazolidine, pyrazoline, piperidine, piperazine, morpholine, thiomorpholine, dihydropyridine, tetrahydropyridine, tetrahydrofuran, tetrahydropyran, dihydrothiazoline, tetrahydrothiazoline, tetrahydroisothiazoline, dihydrooxazine, hexahydroazepine, tetrahydrodiazepine, tetrahydropyridazine, hexa
  • non-aromatic heterocycle which is polycyclic having two or more rings
  • examples of non-aromatic heterocycle include indoline, isoindoline, chroman, isochroman and the like.
  • heterocycle part of “heterocyclylalkyl”, “heterocyclyloxy” or “heterocyclylamino” is same as the above “heterocycle”.
  • the present invention is characterized in that the compound isolated by optical resolution of tricyclic compounds substituted by the other tricyclic group improves cap-dependent endonuclease inhibitory activity.
  • the present invention is also characterized in that the present compound is efficiently absorbed into the body after administration (for example, oral administration), and showing high high efficacy by introducing a group P R to form a prodrug.
  • One or more hydrogen, carbon and/or other atoms in the compounds of the present invention may be replaced with isotopes of hydrogen, carbon and/or other atoms respectively.
  • isotopes include hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, fluorine, iodine and chlorine, such as 2 H, 3 H, 11 C, 13 C, 14 C, 15 N, 18 O, 17 O, 31 P, 32 P, 35 S, 18 F, 123 I and 36 Cl respectively.
  • the compounds of the present invention include compounds replaced with these isotopes.
  • the compounds replaced with the above isotopes are useful as medicines and include all of radiolabeled compounds of the compound of the present invention.
  • a “method of radiolabeling” in the manufacture of the “radiolabeled compounds” is encompassed by the present invention, and the “radiolabeled compounds” are useful for studies on metabolized drug pharmacokinetics, studies on binding assay and/or diagnostic tools.
  • a radiolabeled compound of the present invention can be prepared using well-known methods in this field of the invention.
  • a tritium-labeled compound of the present invention can be prepared by introducing a tritium to a certain compound of the present invention, through a catalytic dehalogenation reaction using a tritium. This method comprises reacting with an appropriately-halogenated precursor of the compound of the present invention with tritium gas in the presence of an appropriate catalyst, such as Pd/C, and in the presence or absent of a base.
  • an appropriate catalyst such as Pd/C
  • the other appropriate method of preparing a tritium-labeled compound can be referred to “Isotopes in the Physical and Biomedical Sciences, Vol. 1, Labeled Compounds (Part A), Chapter 6 (1987)”.
  • a 14 C-labeled compound can be prepared by using a raw material having 14 C.
  • the pharmaceutically acceptable salts of the compounds of the present invention include, for example, salts with alkaline metal (e.g., lithium, sodium, potassium or the like), alkaline earth metal (e.g., calcium, barium or the like), magnesium, transition metal (e.g., zinc, iron or the like), ammonia, organic bases (e.g., trimethylamine, triethylamine, dicyclohexylamine, ethanolamine, diethanolamine, triethanolamine, meglumine, ethylenediamine, pyridine, picoline, quinoline or the like) or amino acids, or salts with inorganic acids (e.g., hydrochloric acid, sulfuric acid, nitric acid, carbonic acid, hydrobromic acid, phosphoric acid, hydroiodic acid or the like) or organic acids (e.g., formic acid, acetic acid, propionic acid, trifluoroacetic acid, citric acid, lactic acid, tartaric acid, oxalic acid, male
  • the compounds of the present invention or its pharmaceutically acceptable salts may form solvates (e.g., hydrates or the like) and/or crystal polymorphs.
  • the present invention encompasses those various solvates and crystal polymorphs.
  • “Solvates” may be those wherein any numbers of solvent molecules (e.g., water molecules or the like) are coordinated with the compounds of the present invention.
  • the compounds of the present invention or its pharmaceutically acceptable salts When the compounds of the present invention or its pharmaceutically acceptable salts are allowed to stand in the atmosphere, the compounds may absorb water, resulting in attachment of adsorbed water or formation of hydrates. Recrystallization of the compounds of the present invention or its pharmaceutically acceptable salts may produce crystal polymorphs.
  • Examples of more preferred embodiment of P R include a group selected from the following formulae a) to ac).
  • Examples of further preferred embodiment of P R include following groups.
  • Examples of another embodiment of a preferable substituent of P R include following groups.
  • a general method for producing the compound of the present invention will be exemplified below.
  • treatment which is performed in a normal experiment of organic chemistry may be conducted.
  • Synthesis of the compound of the present invention can be carried out referring to the procedures known in the art.
  • a salt of the compound of the present invention in the case where the compound of the present invention is obtained in a form of a salt, it may be purified as it is and, in the case where the compound of the present invention is obtained in a free form, a salt may be formed by a normal method by dissolving or suspending the compound in a suitable organic solvent, and adding an acid or a base.
  • the compound of the present invention and a pharmaceutically acceptable salt thereof are present in a form of adducts with water or various solvents (hydrate or solvate) in some cases, and these adducts are included in the present invention.
  • P 1 is hydroxyl protective group
  • RP is acetal protective group
  • L is leaving group
  • Other each symbol is same as above.
  • Compound A3 can be obtained by adding Compound A2 to Compound A1 in the presence of a dehydration-condensation agent such as dicyclohexylcarbodiimide, carbonyldiimidazole, dicyclohexylcarbodiimido-N-hydroxybenzotriazole, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride, hexafluorophosphoric acid 2-(7-aza-1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium, WSC ⁇ HCl, HATU, etc. in a solvent such as DMF, THF, dichloromethane, acetonitrile etc. or in a mixed solvent thereof, and performing a reaction at ⁇ 20° C. to 60° C., preferably ⁇ 10° C. to 40° C. for 0.1 hours to 24 hours, preferably 1 hour to 12 hours.
  • Compound A3 can be obtained by adding an acylating reagent such as diphenylchlorophosphate, thionyl chloride, oxalyl chloride etc. to Compound A1 in the presence or absence of a base such as pyridine, triethylamine, diisopropylethylamine, 1-methylimidazole, etc. in the presence of a solvent such as THF, dioxane, dichloromethane, DMF etc., thereby, generating acid chloride, and adding Compound A2 having a substituent corresponding to an objective compound, and performing a reaction at ⁇ 20° C. to 60° C., preferably ⁇ 10° C. to 40° C. for 0.1 hours to 24 hours, preferably 0.5 hours to 12 hours.
  • an acylating reagent such as diphenylchlorophosphate, thionyl chloride, oxalyl chloride etc.
  • a base such as pyridine, triethyl
  • Compound A4 can be obtained by adding potassium carbonate, sodium carbonate, and O-(2,4-dinitrophenyl)hydroxylamine to Compound A3 in the presence of a solvent such as DMF, DMA, NMP, THF, etc., and performing a reaction at 10° C. to 60° C., preferably 20° C. to 40° C. for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a solvent such as DMF, DMA, NMP, THF, etc.
  • a deprotecting reaction of an acetal protective group of Compound A4 can be performed by the general method described in Protective Groups in Organic Synthesis, Theodora W Green (John Wiley & Sons) etc. Thereafter, a generated aldehyde group is subjected to an intramolecular reaction, thereby, Compound A5 can be obtained.
  • racemate of Compound A5 can be obtained by adding acetic acid and/or paratoluenesulfonic acid, metanesulfonic acid etc., to Compound A4 in the presence of a solvent such as DMF, toluene, THF, etc., and performing a reaction at 10° C. to 80° C., preferably 30° C. to 60° C. for 0.5 hours to 12 hours, preferably 1 hour to 6 hours.
  • Compound A5 can be obtained by optical resolution of the racemate of Compound A5 by SFC or HPLC (chiral column).
  • Compound A7 can be obtained by adding Compound A6, and a base such as sodium carbonate, potassium carbonate, cesium carbonate, etc. to Compound A5 in the presence of a solvent such as DMF, DMA, NMP, THF, etc. or in a mixed solvent thereof, and performing a reaction at 0° C. to 60° C., preferably 10° C. to 40° C. for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a solvent such as DMF, DMA, NMP, THF, etc.
  • Compound A7 can be obtained by adding Compound A6, and T3P, methane sulfonic acid or para-toluene sulfonic acid to Compound A5 in the presence of a solvent such as DMF, ethyl acetate, butyl acetate, 1,4-dioxane etc. or in a mixed solvent thereof, and performing a reaction at 40° C. to 150° C., preferably 60° C. to 120° C. for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a solvent such as DMF, ethyl acetate, butyl acetate, 1,4-dioxane etc. or in a mixed solvent thereof
  • a deprotecting reaction of hydroxyl protective group of Compound A7 can be performed by the general method described in Protective Groups in Organic Synthesis, Theodora W Green (John Wiley & Sons) etc.
  • Compound (III) can be obtained by the general method including converting a hydroxyl group of Compound (II) into an ester group or ether group.
  • P 2 is NH protective group; L 1 and L 2 is leaving group; Other each symbol is same as above.
  • Compound B2 can be obtained by adding Compound A2 and halogenated alkyl such as methyl iodide to Compound B1 in the presence of a base such as diazabicycloundecene in a solvent such as DMF, THF, dichloromethane, acetonitrile, etc. or in a mixed solvent thereof, and performing a reaction at ⁇ 20° C. to 60° C., preferably ⁇ 10° C. to 40° C. for 0.1 hours to 24 hours, preferably 1 hour to 24 hours.
  • a base such as diazabicycloundecene
  • a solvent such as DMF, THF, dichloromethane, acetonitrile, etc. or in a mixed solvent thereof
  • Compound B2 can be obtained by adding acylating reagent such as diphenylchlorophosphate, thionyl chloride, oxalyl chloride, etc. to Compound B1 in a solvent such as THF, dioxane, dichloromethane, DMF, etc. or in a mixed solvent thereof, and adding alcohol in the presence of a base such as pyridine, triethylamine, diisopropylethylamine, 1-methylimidazole, etc., and performing a reaction at ⁇ 20° C. to 60° C., preferably ⁇ 10° C. to 40° C. for 0.1 hours to 24 hours, preferably 0.5 hours to 12 hours.
  • acylating reagent such as diphenylchlorophosphate, thionyl chloride, oxalyl chloride, etc.
  • Compound B3 can be obtained by adding para-toluene sulfonic acid pyridinium and hydrazine protected by Roc etc. to Compound B2 in a solvent such as THF, dioxane, dichloromethane, DMF etc., or in a mixed solvent thereof, and performing a reaction at 10° C. to 150° C., preferably 40° C. to 100° C. for 1 hour to 48 hours, preferably 1 hour to 24 hours.
  • a solvent such as THF, dioxane, dichloromethane, DMF etc.
  • a deprotecting reaction of amino protective group Compound B3 can be performed by the general method described in Protective Groups in Organic Synthesis, Theodora W Green (John Wiley & Sons) etc.
  • Compound B6 can be obtained by adding a base such as n-butyl lithium, etc. to Compound B5 in a solvent such as THF, dioxane, dichloromethane, DMF etc., or in a mixed solvent thereof, and then adding haloformic acid alkyl and performing a reaction for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a base such as n-butyl lithium, etc.
  • a solvent such as THF, dioxane, dichloromethane, DMF etc.
  • Compound B7 can be obtained by adding reducing agent such as Lithium diisobutylaluminum hydride, etc. to Compound B6 in a solvent such as THF, dioxane, dichloromethane, DMF etc., or in a mixed solvent thereof, and performing a reaction for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • reducing agent such as Lithium diisobutylaluminum hydride, etc.
  • Compound B8 can be obtained by adding para-toluene sulfonic acid or methane sulfonic acid to Compound B7 in alcohol, and performing a reaction at 0° C. to 100° C. for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • Compound B10 can be obtained by adding haloformic acid alkyl to Compound B9 in the presence or absence of a base such as pyridine, triethylamine, diisopropylethylamine, 1-methylimidazole, etc., in a solvent such as THF, dioxane, dichloromethane, DMF etc., or in a mixed solvent thereof, and performing a reaction at ⁇ 40° C. to 40° C. for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a base such as pyridine, triethylamine, diisopropylethylamine, 1-methylimidazole, etc.
  • a solvent such as THF, dioxane, dichloromethane, DMF etc.
  • Compound B8 can be obtained by immersing carbon electrode (anode) and platinum electrode (cathode) to Compound B10 in a solvent such as alcohol in the presence of a base such as potassium carbonate and tetraethylaminium perchlorate, and flushing with a constant current of 0.1 ⁇ 1.0A with stirring for 0.1 hours to 48 hours, preferably 1 hour to 24 hours.
  • a base such as potassium carbonate and tetraethylaminium perchlorate
  • Compound (I) can be obtained from Compound B4 and B8 in the same manner as in the third to sixth steps in preparation 1.
  • the compound of the present invention has cap-dependent endonuclease inhibitory activity and is useful as a therapeutic or preventive agent for influenza.
  • the compounds of the present invention may be administered orally as a powder, a granule, tablets, capsules, pills, a liquid and the like or parenterally as an injection, suppositories, a percutaneous drug, an inhalant and the like.
  • the effective doses of the present compounds may be mixed with excipients suitable for the dosage form, such as fillers, binders, humectants, disintegrators, and lubricants, as appropriate, to form pharmaceutical preparations.
  • excipients suitable for the dosage form such as fillers, binders, humectants, disintegrators, and lubricants, as appropriate, to form pharmaceutical preparations.
  • sterilization is performed with a suitable carrier.
  • compositions according to the present invention can be administered either orally or parenterally.
  • oral administration commonly used dosage forms, such as tablets, granule, powder, and capsules, may be prepared according to conventional methods.
  • parenteral administration any commonly used dosage form, such as an injection, may be suitably used.
  • the compounds according to the present invention can be suitably used as oral preparations because of their high oral absorbability.
  • the effective doses of the compounds of the present invention can be mixed with various pharmaceutical excipients suitable for the dosage form, such as fillers, binders, disintegrators, and lubricants, as appropriate, to form pharmaceutical compositions.
  • various pharmaceutical excipients suitable for the dosage form such as fillers, binders, disintegrators, and lubricants, as appropriate, to form pharmaceutical compositions.
  • the dose depends on the condition of the disease, administration route, or age or weight of the patient.
  • the usual oral dose for adults is 0.1 to 100 mg/kg per day, preferably 1 to 20 mg/kg per day.
  • the dose of the pharmaceutical composition of the present invention is preferably determined on the basis of the age and weight of the patient, type and severity of the disease, administration route and the like.
  • the usual oral dose for adults is in the range of 0.05 to 100 mg/kg per day, preferably 0.1 to 10 mg/kg per day.
  • the parenteral dose for adults significantly varies depending on the administration route but is usually in the range of 0.005 to 10 mg/kg per day, preferably 0.01 to 1 mg/kg per day.
  • the dose may be administered once daily or may be divided into multiple daily doses.
  • the compound of the present invention can be used in combination with other drugs or the like (hereinafter referred to as combination drugs) to increase the activity of the compound, reduce the dose of the compound, or the like.
  • combination drugs e.g., Oseltamivir, Zanamivir, Peramivir, Inabiru and the like
  • RNA-dependent RNA polymerase inhibitor e.g., Favipiravir
  • M2 protein inhibitor e.g., Amantadine
  • PB2 Cap binding inhibitor e.g., VX-787
  • anti-HA antibody e.g., MHAA4549A
  • Immune agonists e.g., Nitazoxanide
  • the timing of administration for a compound of the present invention and the combination drug is not limited. They can be administered to the subjects to be treated, at a time or at different times. Furthermore, a compound of the present invention and the combination drug can be administered as two or more formulations independently comprising each active ingredient or a single formulation comprising each active ingredient.
  • the dose for combination drugs may be appropriately selected in reference to the clinical dose.
  • the compounding ratio of the compounds of the present invention and co-administered drugs may be appropriately selected depending on the subject to be treated, administration route, disease to be treated, symptoms, combination of the drugs and the like.
  • 1 part by weight of the compounds of the present invention may be used in combination with 0.01 to 100 parts by weight of co-administered drugs.
  • RT represents a retention time at LC/MS: liquid chromatography/mass spectrometry, and was measured under the following conditions.
  • Compound 16 was obtained in the same manner as in the seventh and eighth steps in reference example 1.
  • Compound 23 was obtained in the same manner as in the seventh step in reference example 1.
  • the obtained organic layer was washed with water and 8% aqueous solution of sodium hydrogen carbonate, dried over anhydrous sodium sulfate, and concentrated under reduced pressure.
  • the obtained residue was dissolved in THF (5.5 L) and potassium carbonate (790 g, 5713 mmol) was added thereto.
  • the mixture was warmed up to 50° C., benzyl bromide (240 ml, 2016 mmol) was added dropwise thereto, and the mixture was stirred at 60° C. for 8.5 hours.
  • To the mixture was added dropwise 2 mol/L aqueous solution of hydrochloric acid under ice-water bath, and the mixture was stirred at room temperature for 10 minutes and extracted with ethyl acetate.
  • Compound III-1 was obtained in the same manner as in the second step in example 1.
  • the compounds in connection with the present invention and/or the parent compounds of the compounds in connection with the present invention are useful for symptoms and/or diseases which are induced by influenza virus.
  • they are useful for treating and/or preventing, or improving symptoms of, cold-like symptoms accompanying fever, algor, headache, muscular pain, general malaise etc., airway inflammation symptoms such as pharyngalgia, nasal secretion, nasal congestion, cough, sputum etc., gastrointestinal symptoms such as abdominal pain, vomitus, diarrhea etc. and, further, complications accompanying secondary infection such as acute encephalopathy and pneumonia.
  • the compounds in connection with the present invention are a prodrug and thus have advantages that oral absorbability is high, good bioavailability is exhibited, good clearance is exhibited, and pulmonary transitivity is high, they can be excellent medicaments.
  • parent compounds of the compounds in connection with the present invention have the effects such as high inhibitory activity on cap structure-dependent endonuclease, and high selectivity due to a virus-specific enzyme, they can be medicaments having reduced side effects.
  • the compounds in connection with the present invention and/or the parent compounds of the compounds in connection with the present invention also have advantages that metabolism stability is high, solubility is high, oral absorbability is high, good bioavailability is exhibited, good clearance is exhibited, pulmonary transitivity is high, a half life is long, a non-protein binding rate is high, hERG channel inhibition is low, CYP inhibition is low, CPE (CytoPathic Effect) inhibiting effect is recognized, and/or negativity is exhibited in a phototoxicity test, an Ames test and a gene toxicity test, or toxicity such as liver damage is not caused. Therefore, the compounds in connection with the present invention can be excellent medicaments.
  • the compounds in connection with the present invention and/or the parent compounds of the compounds in connection with the present invention can be administered orally or parenterally.
  • the present compounds can be also used as a normal preparation, for example, as any dosage form of solid preparations such as tablets, powders, granules, capsules etc.; solutions; oleaginous suspensions; or liquid preparations such as syrups or elixirs etc.
  • the compounds in connection with the present invention can be used as aqueous or oleaginous suspension injectables, or nose drops.
  • the pharmaceutical composition of the present invention can be produced by combining (for example, mixing) a therapeutically effective amount of the present compound with pharmaceutically acceptable carriers or diluents.
  • a dose of the compounds in connection with the present invention is different depending on an administration method, an age, a weight and the state of a patient, and a kind of a disease and, usually, in the case of oral administration, about 0.05 mg to 3000 mg, preferably about 0.1 mg to 1000 mg for adult per day may be administered, if necessary, by division. In addition, in the case of parenteral administration, about 0.01 mg to 1000 mg, preferably about 0.05 mg to 500 mg for adult per day is administered.
  • Test Example 1 Measurement of Cap-Dependent Endonuclease (CEN) Inhibitory Activity
  • RNP was prepared from a virus particle using standard method (Reference Document: VIROLOGY(1976) 73, p327-338 OLGA M. ROCHOVANSKY). Specifically, A/WSN/33 virus (1 ⁇ 10 3 PFU/mL, 200 ⁇ L) was inoculated in a 10 days old embryonated chicken egg. After incubation at 37° C. for 2 days, the allantoic fluid of the chicken egg was recovered.
  • a virus particle was purified by ultracentrifugation using 20% sucrose, solubilized using TritonX-100 and lysolecithin, and an RNP fraction (50-70% glycerol fraction) was collected by ultracentrifugation using a 30-70% glycerol density gradient, and was used as an enzyme solution (containing approximately 1 nM PB1-PB2-PA complex).
  • An enzymatic reaction solution (2.5 ⁇ L) (composition: 53 mM Tris-hydrochloride (pH 7.8), 1 mM MgCl 2 , 1.25 mM dithiothreitol, 80 mM NaCl, 12.5% glycerol, enzyme solution 0.15 ⁇ L) was dispensed into a 384-well plate made of polypropylene. Then, 0.5 ⁇ L of a test compound solution which had been serially diluted with dimethyl sulfoxide (DMSO) was added to the plate. As a positive control (PC) or a negative control (NC), 0.5 ⁇ L of DMSO was added to the plate respectively. Each plate was mixed well.
  • DMSO dimethyl sulfoxide
  • PC positive control
  • NC negative control
  • a substrate solution (1.4 nM substrate RNA, 0.05% Tween20) was added to initiate a reaction. After room temperature incubation for 60 minutes, 1 ⁇ L, of the reaction solution was collected and added to 10 ⁇ L of a Hi-Di formamide solution (containing GeneScan 120 Liz Size Standard as a sizing marker: manufactured by Applied Biosystems (ABI)) in order to stop the reaction.
  • a Hi-Di formamide solution containing GeneScan 120 Liz Size Standard as a sizing marker: manufactured by Applied Biosystems (ABI)
  • the reaction was stopped in advance by adding EDTA (4.5 mM) before initiation of the reaction (all concentrations described above are final concentrations).
  • the solution for which the reaction was stopped was heated at 85° C. for 5 minutes, rapidly cooled on ice for 2 minutes, and analyzed with an ABI PRIZM 3730 genetic analyzer.
  • a peak of the cap-dependent endonuclease product was quantitated by analysis software ABI Genemapper, a CEN reaction inhibition ratio (%) of a test compound was obtained by setting fluorescent intensities of PC and NC to be 0% inhibition and 100% inhibition, respectively, an IC 50 value was obtained using curve fitting software (XLfit2.0: Model 205 (manufactured by IDBS) etc.).
  • the IC 50 values of test substances being a parent compound are shown in Table 39.
  • FCS E-MEM 2% FCS E-MEM was used at the use of MDBK cells, and 0.5% BSA E-MEM was used at the use of MDCK cells.
  • BSA E-MEM 0.5% BSA E-MEM was used at the use of MDCK cells.
  • test sample was diluted with a culture medium to an appropriate concentration in advance, and then 2 to 5-fold serial dilution on a 96 well plate (50 ⁇ L/well) was prepared. Two plates, one for measuring anti-Flu activity and the another for measuring cytotoxity, were prepared. Each assay was performed triplicate for each drug.
  • Trypsin was added to the cells to be a final concentration of 3 ⁇ g/mL only for measuring anti-Flu activity.
  • An influenza virus was diluted with a culture medium to an appropriate concentration in advance, and each 50 ⁇ L/well was dispensed on a 96-well plate containing a test substance. Each 50 ⁇ L/well of a culture medium was dispensed on a plate containing a test substance for measuring cytotoxity.
  • Each 100 ⁇ L/well of cells which had been adjusted to the appropriate cell number was dispensed on a 96 well plate containing a test sample.
  • the cells in the 96-well plate which had been incubated for 3 days was observed visually under a microscope, and appearance of the cells, the presence or absence of a crystal of test substance were checked. The supernatant was removed so that the cells were not absorbed from the plate.
  • WST-8 Kit was diluted 10-fold with a culture medium, and each 100 ⁇ L was dispensed into each well. After mixing with a plate mixer, cells were incubated in a CO2 incubator for 1 to 3 hours.
  • each 10 ⁇ L/well of a 10% SDS solution was dispensed in order to inactivate a virus.
  • the value was calculated using Microsoft Excel or a program having the equivalent calculation and processing ability, based on the following calculation equation.
  • test Example 1 For test substances (compounds of Reference examples) being a parent compound, measurement results of Test Example 1 and Test Example 2 are shown in Table 39.
  • the parent compounds exhibit high cap-dependent endonuclease (CEN) inhibitory activity and/or high CPE inhibitory effect and thus can be a useful agent for treatment and/or prevention of symptom and/or disease induced by infection with influenza virus.
  • CEN cap-dependent endonuclease
  • CYP1A2 7-ethoxyresorufin O-deethylation
  • CYP2C9 mephenytoin 4′-hydroxylation
  • CYP2D6 dextromethorphan O-demethylation
  • CYP3A4 terfenedine hydroxylation
  • reaction conditions were as follows: substrate, 0.5 ⁇ mol/L ethoxyresorufin (CYP1A2), 100 ⁇ mol/l, tolbutamide (CYP2C9), 50 ⁇ mol/L S-mephenytoinmephenitoin (CYP2C19), 5 ⁇ mol/L dextromethorphan (CYP2D6), 1 ⁇ mol/L terfenedine (CYP3A4); reaction time, 15 minutes; reaction temperature, 37° C.; enzyme, pooled human hepatic microsome 0.2 mg protein/mL; concentration of a compound of the present invention, 1, 5, 10, 20 ⁇ mol/L (four points).
  • resorufin CYP1A2 metabolite
  • CYP1A2 metabolite resorufin in the supernatant was quantified by a fluorescent multilabel counter and toltributamide hydroxide (CYP2C9P metabolite), mephenytoin 4′ hydroxide (CYP2C19 metabolite), dextromethorphan (CYP2D6 metabolite), and terfenadine alcohol (CYP3A4 metabolite) were quantified by LC/MS/MS.
  • the prodrug had improved bioavailability other than the parent compound.
  • the compound of the present invention has excellent oral absorbability and can be a useful agent for treatment and/or prevention of symptom and/or disease induced by infection with influenza virus.
  • a compound of the present invention was reacted for a constant time, and a remaining rate was calculated by comparing a reacted sample and an unreacted sample, thereby, a degree of metabolism in liver was assessed.
  • a reaction was performed (oxidative reaction) at 37° C. for 0 minute or 30 minutes in the presence of 1 mmol/L NADPH in 0.2 mL of a buffer (50 mmol/L Tris-HCl pH 7.4, 150 mmol/L potassium chloride, 10 mmol/L magnesium chloride) containing 0.5 mg protein/mL of human liver microsomes.
  • the compound of the present invention in the supernatant was quantified by LC/MS/MS or Solid Phase Extraction (SPE)/MS, and a remaining amount of the compound of the present invention after the reaction was calculated, letting a compound amount at 0 minute reaction time to be 100%.
  • Hydrolysis reaction was performed in the absence of NADPH and glucuronidation reaction was in the presence of 5 mM UDP-glucuronic acid in place of NADPH, followed by similar operations.
  • the CYP3A4 fluorescent MBI test is a test of investigating enhancement of CYP3A4 inhibition of a compound of the present invention by a metabolism reaction, and the test was performed using, as CYP3A4 enzyme expressed in Escherichia coli and employing, as an index, a reaction in which 7-benzyloxytrifluoromethylcoumarin (7-BFC) is debenzylated by the CYP3A4 enzyme to produce a metabolite, 7-hydroxytrifluoromethylcoumarin (HFC) emitting fluorescent light.
  • 7-BFC 7-benzyloxytrifluoromethylcoumarin
  • reaction conditions were as follows: substrate, 5.6 ⁇ mol/L 7-BFC; pre-reaction time, 0 or 30 minutes; reaction time, 15 minutes; reaction temperature, 25° C. (room temperature); CYP3A4 content (expressed in Escherichia coli ), at pre-reaction 62.5 ⁇ mol/mL, at reaction 6.25 ⁇ mol/mL (at 10-fold dilution); test drug concentration of a compound of the present invention, 0.625, 1.25, 2.5, 5, 10, 20 ⁇ mol/L (six points).
  • NADPH was added to a remaining preincubation solution to initiate a preincubation (with preincubation) and, after a predetermined time of a preincubation, a part was transferred to another plate so that it was 1/10 diluted with a substrate and a K-Pi buffer to initiate a reaction as an index.
  • rat typhoid bacillus Salmonella typhimurium TA98 strain, TA100 strain
  • a liquid nutrient medium (2.5% Oxoid nutrient broth No. 2)
  • 9 mL of a bacterial solution of the TA98 strain was centrifuged (2000 ⁇ g, 10 minutes) to remove a culturing solution.
  • DMSO solution of a compound of the present invention (several stage dilution from maximum dose 50 mg/mL at 2 to 3 fold ratio), DMSO as a negative control, and 50 ⁇ g/mL of 4-nitroquinoline-1-oxide DMSO solution for the TA98 strain, 0.25 ⁇ g/mL of 2-(2-furyl)-3-(5-nitro-2-furyl)acrylamide DMSO solution for the TA100 strain under the non-metabolism activating condition, 40 ⁇ g/mL of 2-aminoanthracene DMSO solution for the TA98 strain, 20 ⁇ g/mL of 2-aminoanthracene DMSO solution for the TA100 strain under the metabolism activating condition as a positive control, and 588 ⁇ L of the test bacterial solution (a mixed solution of 498 ⁇ l of the test bacterial solution and 90 ⁇ L of S9 mix under the metabolism activating condition) were mixed, and this was shaking-cultured at 37° C
  • 460 ⁇ L of the bacterial solution exposed to a compound of the present invention was mixed with 2300 ⁇ L of an Indicator medium (Micro F buffer containing biotin: 8 ⁇ g/mL, histidine: 0.2 ⁇ g/mL, glucose: 8 mg/mL, Bromo Cresol Purple: 37.5 ⁇ g/mL), each 50 ⁇ L was dispensed into microplate 48 wells/dose, and this was subjected to stationary culturing at 37° C. for 3 days.
  • an Indicator medium Micro F buffer containing biotin: 8 ⁇ g/mL, histidine: 0.2 ⁇ g/mL, glucose: 8 mg/mL, Bromo Cresol Purple: 37.5 ⁇ g/mL
  • the solubility of the compound of the present invention was determined under 1% DMSO addition conditions.
  • a 10 mmol/L solution of the compound was prepared with DMSO, and 2 ⁇ L of the solution of the compound of the present invention was added, respectively, to 198 ⁇ L of JP-1 solution (water were added to 2.0 g of sodium chloride and 7.0 mL of hydrochloric acid to reach 1000 mL) and, JP-2 solution (1 volume of water were added to 1 volume of the solution which 3.40 g of potassium dihydrogen phosphate and 3.55 g of anhydrous disodium hydrogen phosphate to reach 1000 mL).
  • the mixture was shaked for 1 hour at a room temperature, and the mixture was filtered.
  • JP-1st Fluid water was added to 2.0 g of sodium chloride in 7.0 mL of hydrochloride acid to reach 1000 mL
  • JP-2nd Fluid water was added to 500 mL of phosphate buffer solution with a pH of 6.8 and 20 mmol/L sodium taurocholate (TCA)/JP-2nd Fluid
  • TCA sodium taurocholate
  • JP-2nd Fluid was added to 1.08 g of TCA in JP-2nd Fluid to reach 100 mL
  • the mixture was filtered and 100 ⁇ L of methanol was added to 100 ⁇ L of each filtrate (double dilution). Dilution magnification was changed if necessary. After it was confirmed whether there were air bubbles and precipitates in the vials, the vials were shaken with tight stopper. The compound concentration was determined with HPLC by the absolute calibration method.
  • Test Example 11 Ames Test
  • Ames test was performed by using Salmonellas ( Salmonella typhimurium ) TA 98, TA100, TA1535 and TA1537 and Escherichia coli WP2uvrA as test strains with or without metabolic activation in the pre-incubation method to check the presence or absence of gene mutagenicity of compounds of the present invention.
  • the compound of the present invention was dissolved at target concentrations and was mixed with a 2.5 v/v % suspension of red blood cells prepared from a defibrinated blood of sheep on a microplate at concentrations of 0.0008 to 0.1 w/v %.
  • the mixtures were exposed to 10 J/cm 2 of UV-irradiation within a range of wavelength 290 to 400 nm, UVA and UVB using ultra violet fluorescent lamps, GL20SE and FL20S-BLB lamps manufactured by Sankyo Denki Co., Ltd. and Panasonic Corporation, respectively. After the completion of the irradiation, the mixtures were centrifuged, and a supernatant of the mixture was collected and was located on a microplate.
  • the phototoxicity was assessed by measuring an absorbance at wavelength of 540 nm and 630 nm in the supernatant.
  • the absorbance data at wavelength of 540 nm and 630 nm were used as indicators of biomembrane damage (photohemolysis %) and hyperoxidation of lipid membrane (methemoglobin formation), respectively.
  • the criteria of phototoxicity was as follows; It was judged to be non-phototoxic ( ⁇ ) when the photohemolysis % ⁇ 10 and the maximal change in the absorbance at 630 nm ( ⁇ OD) ⁇ 0.05 were observed. It was judged to be non-phototoxic (+) when the photohemolysis was more than 10% and the maximal change in the absorbance at 630 nm ( ⁇ OD) was more than 0.05.
  • FIGS. 1 and 2 show a result of measuring the plasma concentration of Compound 111-2 and Compound 11-6 after oral administration of prodrug Compound 11-6, the parent compound of which is Compound 111-2, to rat under non-fasting conditions.
  • prodrug Compound 11-6 the parent compound of which is Compound 111-2 is found to have changed promptly to Compound 111-2 in vivo after administration (see FIG. 2 ).
  • the compound converted into a prodrug was absorbed into the body after oral administration, and rapidly converted into a parent compound in the blood. Therefore, the compound of the present invention can be a useful agent for treatment and/or prevention of symptom and/or disease induced by infection with influenza virus.
  • Compound 111-2 is a compound having a low total body clearance and a long half-life.
  • the compound of the present invention has excellent persistence and can be a useful agent for treatment and/or prevention of symptom and/or disease induced by infection with influenza virus.
  • the compounds of the present invention, lactose and calcium stearate are mixed.
  • the mixture is crushed, granulated and dried to give a suitable size of granules.
  • calcium stearate is added to the granules, and the mixture is compressed and molded to give tablets.
  • the compounds of the present invention, lactose and calcium stearate are mixed uniformly to obtain powder medicines in the form of powders or fine granules.
  • the powder medicines are filled into capsule containers to give capsules.
  • lactose and calcium stearate are mixed uniformly and the mixture is compressed and molded. Then, it is crushed, granulated and sieved to give suitable sizes of granules.
  • the compounds of the present invention and crystalline cellulose are mixed, granulated and tablets are made to give orally disintegrated tablets.
  • the compounds of the present invention and lactose are mixed, crushed, granulated and sieved to give suitable sizes of dry syrups.
  • the compounds of the present invention and phosphate buffer are mixed to give injection.
  • the compounds of the present invention and phosphate buffer are mixed to give injection.
  • the compound of the present invention and lactose are mixed and crushed finely to give inhalations.
  • the compounds of the present invention and petrolatum are mixed to give ointments.
  • the compounds of the present invention and base such as adhesive plaster or the like are mixed to give patches.
  • the compound of the present invention has cap-dependent endonuclease (CEN) inhibitory activity after absorption into the body.
  • CEN cap-dependent endonuclease
  • the compound of the present invention can be a useful agent for treatment and/or prevention of symptom and/or disease induced by infection with influenza virus.

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