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    • 5. 发明申请
    • Process for Preparing Substantially Pure Simvastatin
    • 准备基本纯辛伐他汀的方法
    • US20110282074A1
    • 2011-11-17
    • US12832263
    • 2010-07-08
    • Sugata ChatterjeeAjay Singh RawatNeeraj KumarJetti RajanikanthKundan Singh ShekhawatJigar H. ShahP. Venkateswarlu
    • Sugata ChatterjeeAjay Singh RawatNeeraj KumarJetti RajanikanthKundan Singh ShekhawatJigar H. ShahP. Venkateswarlu
    • C07D309/30
    • C07D309/30Y02P20/55
    • This invention relates to an improved process for preparing substantially pure simvastatin (I), chemically known as (1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-hydroxy-6-oxotetrahydro-2-H-pyran-2-yl]ethyl]-3 ,7-dimeth-yl-1,2,3,7,8,8a-Hexahydronaphthalen-1-yl2,2-dimethyl butanoate, which comprises of: a) treating lovastatin (II) with an alkali metal hydroxide in a chosen suitable alcoholic solvent followed by relactonization to obtain the diol lactone intermediate (III) in a single vessel. b) selective silylation of 4-hydroxy group of diol lactone intermediate (III) with a chosen suitable silylating reagent to obtain mono silylated intermediate diol lactone (IV). c) acylation of the mono silylated intermediate (IV) to form silylated simvastatin (V) Or optionally, preparing silylated simvastatin (V) starting from Lovastatin (II) without isolating diol lactone (III) and monosilylated diol lactone (IV) and d) finally, removal of the silyl protecting group on silylated simvastatin (V) followed by purification to provide substantially pure simvastatin (I).
    • 本发明涉及用于制备基本上纯的辛伐他汀(I)的改进方法,其化学方法称为(1S,3R,7S,8S,8aR)-8- [2 - [(2R,4R)-4-羟基-6-氧代四氢 -2-H-吡喃-2-基]乙基] -3,7-二甲基-1,2,3,7,8,8a-六氢萘-1-基2,2,2-二甲基丁酸酯,其包含:a )用碱金属氢氧化物在选择的合适的醇溶剂中治疗洛伐他汀(II),然后进行重组,以在单个容器中获得二醇内酯中间体(III)。 b)用选择的合适的甲硅烷基化试剂选择甲硅烷基化二醇内酯中间体(III)的4-羟基,得到单甲硅烷基化中间体二醇内酯(IV)。 c)单甲硅烷基化中间体(IV)的酰化形成甲硅烷基化辛伐他汀(V)或任选地,从洛伐他汀(II)开始制备不分离二醇内酯(III)和单甲硅烷基化二醇内酯(IV)的甲硅烷基化辛伐他汀(V) 最后,除去甲硅烷基化辛伐他汀(V)上的甲硅烷基保护基,然后纯化,得到基本上纯的辛伐他汀(I)。
    • 10. 发明授权
    • Process for the preparation of substantially pure palonosetron and its acid salts
    • 制备基本上纯粹的帕洛诺司琼及其酸式盐的方法
    • US08093391B2
    • 2012-01-10
    • US12652090
    • 2010-01-05
    • Sugata ChatterjeeAjay Singh RawatAnil V. PawarJetti RajanikanthPenigandla Venkateswarlu
    • Sugata ChatterjeeAjay Singh RawatAnil V. PawarJetti RajanikanthPenigandla Venkateswarlu
    • C07D401/00C07D211/06C07D211/40C07D211/54C07D211/00A61K31/44A61K31/445A01N43/40
    • C07D453/02
    • This invention relates to an improved and scalable process for the preparation of substantially pure palonosetron and its acid addition salts, in particular hydrochloride (I) which comprises of, (a) converting intermediate (IIa) as such or as its freebase (II) to a crude mixture of diastereomeric palonosetrons (VIII) or (VIIIa) contaminated with varying amounts of unconverted intermediate (II) or (IIa) via hydrogenation under pressure with an appropriately chosen hydrogenation catalyst in an suitable organic solvent. (b) making the resulting crude mixture of diastereomeric palonosetrons (VIII) or (VIIIa) contaminated with varying amounts of unconverted intermediate (II) or (IIa) substantially free from (II) or (IIa) via halogenation reaction. (c) Finally, converting the resulting diastereomeric palonosetron (VIII) or its hydrochloride (VIIIa) substantially free from intermediate (II) or (IIa) to the desired palonosetron hydrochloride (I) in substantially pure form via selective crystallization from a suitable single or mixture of organic solvents.
    • 本发明涉及一种用于制备基本上纯的帕洛诺司琼及其酸加成盐,特别是盐酸盐(I)的改进和可伸缩的方法,其包括(a)将本文中间体(IIa)或其游离碱(II)转化为 通过在合适的有机溶剂中用适当选择的氢化催化剂在压力下氢化,用不同量的未转化的中间体(II)或(IIa)污染的非对映异构的帕洛诺司琼(VIII)或(VIIIa)的粗混合物。 (b)通过卤化反应使所得到的非对映异构体帕洛诺司琼(VIII)或(VIIIa)的粗混合物被不同量的未转化的中间体(II)或(IIa)污染,基本上不含(II)或(IIa)。 (c)最后,将基本上不含中间体(II)或(IIa)的所得非对映体帕洛诺司琼(VIII)或其盐酸盐(VIIIa)以基本上纯的形式通过选择性结晶从合适的单一或 有机溶剂的混合物。