JP6296526B2 - 抗b型肝炎ウイルス薬 - Google Patents
抗b型肝炎ウイルス薬 Download PDFInfo
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- JP6296526B2 JP6296526B2 JP2017100501A JP2017100501A JP6296526B2 JP 6296526 B2 JP6296526 B2 JP 6296526B2 JP 2017100501 A JP2017100501 A JP 2017100501A JP 2017100501 A JP2017100501 A JP 2017100501A JP 6296526 B2 JP6296526 B2 JP 6296526B2
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- hbv
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- hepatitis
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Description
で示される5−(4−アミノ−3−ハロ−1H−ピラゾロ[3,4−d]ピリミジン−1−イル)−3−(ヒドロキシメチル)シクロペント−3−エン−1,2−ジオールが抗C型肝炎ウイルス(HCV)活性を示すことが記載されているが、50%有効濃度(EC50)は、陽性対照のKZ−16(Biochem. Biophys. Res. Commun. 2011, 415, 714-719記載のフェナントリジノン誘導体)が0.17μMであるのに対し、6.6〜87.6μMであり、必ずしも十分なものではなかった。
で示される5−(5−ハロ−4−メチル−7H−ピロロ[2,3−d]ピリミジン−7−イル)−3−(ヒドロキシメチル)シクロペント−3−エン−1,2−ジオールが抗C型肝炎ウイルス(HCV)活性を示すことが記載されているが、50%有効濃度(EC50)は、陽性対照のKZ−16(Biochem. Biophys. Res. Commun. 2011, 415, 714-719記載のフェナントリジノン誘導体)が0.17μMであるのに対し、37.3〜46.2μMであり、必ずしも十分なものではなかった。
(1)下記式(I):
で示される化合物、その塩又はそれらの溶媒和物を含有する抗B型肝炎ウイルス薬。
(2)前記式(I)において、Baseが前記式(a)で示される基である前記(1)に記載の抗B型肝炎ウイルス薬。
(3)前記式(I)において、Baseが前記式(b)で示される基である前記(1)に記載の抗B型肝炎ウイルス薬。
前記式(I)で示される化合物の塩としては、薬学的に許容される塩が好ましく、例えば、塩酸、硫酸、リン酸、臭化水素酸、ヨウ化水素酸、硝酸、ピロ硫酸、メタリン酸等の無機酸、又はクエン酸、安息香酸、酢酸、プロピオン酸、フマル酸、マレイン酸、スルホン酸(例えば、メタンスルホン酸、p−トルエンスルホン酸、ナフタレンスルホン酸)等の有機酸との塩が挙げられる。
前記式(I)で示される化合物のうち、Baseが前記式(a)で示される基である化合物(Ia)は、例えば、非特許文献1(ChemMedChem 2013, 8, 1673-1680)に記載の方法に従って、以下に示すようにして製造することができる。
(i) NIS, DMF, RT, 4h; (ii) (Boc)2O, DMAP, THF, RT, 6h; (iii) sat.NaHCO3, MeOH, RT, 3h; (iv) Ph3P, DIAD, THF, 0-5℃, 2h; (v) 10% conc. HCl in CH3OH, 60℃, 5h.
Di-Boc-protected 3-iodo-1-((4R)-2,2-dimethyl-6-((trityloxy)methyl)-4,6a-dihydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)-1H-pyrazolo-[3,4-d]pyrimidin-4-amine
mp: 89-99℃; MS (ESI) (m/z): [M++1] 872.0; UV (MeOH): λmax=264 nm; 1H NMR (400 MHz, CDCl3): δ=8.97 (s, 1H, 2-CH), 7.21-7.46 (m, 15H, trityl), 6.04-6.08 (m, 2H, 1’,6’-CH), 5.33-5.35 (d, J=5.8 Hz, 1H, 2’-CH), 4.88-4.90 (d, J=5.9 Hz, 1H, 3’-CH), 3.95-3.99 (d, J=15.3 Hz, 1H, 5’-CH2), 3.80-3.84 (d, J=15.3 Hz, 1H, 5’-CH2), 1.45 (s, 3H, CH3), 1.42 (s, 18H, Boc-6CH3), 1.33 ppm (s, 3H, CH3).
(1S,2R,5R)-5-(4-Amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)-3-(hydroxymethyl)cyclopent-3-ene-1,2-diol
mp:194-196℃; MS (ESI) (m/z): [M++1] 390.0; [α]D 21=-147.88 cm3g-1dm-1 (c=0.24 MeOH); UV (MeOH): λmax=264 nm; 1H NMR (400 MHz, [D6]DMSO): δ=9.18-9.22 (bs, 1H, NH2), 8.49 (s, 1H, 2-CH), 8.02-8.21 (bs, 1H, NH2), 5.64-5.65 (m, 1H, 1’-CH), 5.56-5.57 (m, 1H, 6’-CH), 4.61-5.22 (bs, 3H, 2’, 3’ & 5’-OH), 4.38-4.39 (m, 1H, 2’-CH), 4.26-4.29 (m, 1H, 3’-CH), 4.07-4.11 ppm (m, 2H, 5’-CH2); 13C NMR (100 MHz, [D6]DMSO): δ=153.06, 152.10, 150.23, 148.93, 123.23, 102.68, 92.39, 76.45, 71.82, 67.00, 58.39 ppm.
非特許文献1(ChemMedChem 2013, 8, 1673-1680)及び非特許文献2(Bioorganic & Medicinal Chemistry Letters 2012, 22, 7742-7747)に記載の方法、又はその他の公知の方法に従って、表1に示す各種炭素環ヌクレオシド類を合成した。
HepG2.2.15.7細胞(肝芽細胞腫(hepatoblastoma)細胞株HepG2に、HBV遺伝子がトランスフェクションされ、持続的にウイルスを産生するHepG2.2.15細胞(Journal of Virology, Aug. 1988, 62, 2836-2844)由来で、国立感染症研究所において樹立されたクローン細胞であり、親株であるHepG2.2.15細胞よりも効率良くウイルスを産生するクローン細胞)を用いて、各種炭素環ヌクレオシド類の抗HBVアッセイを以下のようにして行った。
2)細胞をCO2インキュベーター内、37℃で24時間インキュベートした。
3)各試験化合物を様々な濃度で含有する新鮮な培地100μlをプレートに加えた。
4)細胞をCO2インキュベーター内、37℃で3日間インキュベートした。
5)培地を、各化合物を含有する新たな培地で完全に置き換えた。
6)細胞をCO2インキュベーター内、37℃で3日間インキュベートした。
7)培養上清100μlを新たな96穴マイクロタイタープレートに移した。
8)細胞をMTTアッセイにより分析し、細胞生存率を測定した。
9)各培養上清10〜20μlに同容量のSideStepTM溶解・安定化緩衝液(Agilent Technologies #400900)を加えて、1分間ボルテックスして培地中の粗DNAを抽出した。
10)DNA溶液を使用するまで、ディープフリーザーで保存した。
11)リアルタイムPCR法を用いて、培地中のHBV DNAを定量した。
結果を表1及び図1に示す。
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