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    • 36. 发明授权
    • Process for the preparation of valsartan
    • 制备缬沙坦的方法
    • US08981109B2
    • 2015-03-17
    • US13261552
    • 2011-06-24
    • Raveendra Reddy ChintaGangadhara Bhima Shankar NangiMahendar Reddy NayiniSomappa Somannavar YallapaShankar Reddy BudidetIslam AminulSivakumaran Meenakshisunderam
    • Raveendra Reddy ChintaGangadhara Bhima Shankar NangiMahendar Reddy NayiniSomappa Somannavar YallapaShankar Reddy BudidetIslam AminulSivakumaran Meenakshisunderam
    • C07D257/04
    • C07D257/04
    • The present invention relates to a process for the preparation of pure Valsartan (I) substantially free from impurities of formulae (Ia), (Ib), and (Ic), which comprises: (i) condensing 2-(4′-bromomethylphenyl)benzonitrile of formula (II) with L-valine methyl ester hydrochloride of formula (V) in the presence of a base in a solvent to produce N-[(2′-cyanobiphenyl-4-yl)methyl]-(L)-valine methyl ester of formula (VI); (ii) treating the compound VI of step (i) with acid followed by treating with base to produce pure compound VI substantially free from dimeric impurity of formula (Via); (iii) reacting the pure compound of formula (VI) with n-valeryl chloride in the presence of a base to produce pure N-valeryl-N-[(2′-cyanobiphenyl-4-yl)methyl]-(L)-valine methyl ester (VII) substantially free from alkene impurity of formula (Vila); (iv) reacting the compound of formula (VII) with trialkyltin chloride and a metal azide in a solvent at a reflux temperature to produce N-(1-oxopentyl)-N-[[2′-(2-tributyltintetrazol-5-yl)-(1,1′-biphenyl)-4-yl]methyl]-(L)-valine methyl ester of formula (VHIb) free from thermal degradation impurity (Villa); (v) hydrolyzing the compound of formula (VHIb) in the presence of alkaline conditions to produce Valsartan (I).
    • 本发明涉及制备基本上不含式(Ia),(Ib)和(Ic)杂质的纯缬沙坦(I)的方法,其包括:(i)将2-(4'-溴甲基苯基) (II)的苄腈与式(V)的L-缬氨酸甲酯盐酸盐在碱的存在下在溶剂中反应,得到N - [(2'-氰基联苯-4-基)甲基] - (L) - 缬氨酸 (VI)的甲酯; (ii)用酸处理步骤(i)的化合物VI,然后用碱处理以产生基本上不含式(VIa)的二聚杂质的纯化合物VI; (ⅲ)在碱的存在下使式(Ⅵ)的纯的化合物与正戊酰氯反应,得到纯的N-戊酰基-N - [(2'-氰基联苯-4-基)甲基] - (L) - 缬氨酸甲酯(VII)基本上不含式(VIIa)的烯烃杂质; (ⅳ)使式(Ⅶ)化合物与三烷基氯化锡和金属叠氮化物在溶剂中在回流温度下反应,得到N-(1-氧代戊基)-N - [[2' - (2-三丁基四唑-5-基 ) - (1,1'-联苯基)-4-基]甲基] - (L))不含热降解杂质的式(VHIb)的缬氨酸甲酯(Villa); (v)在碱性条件存在下水解式(VHIb)化合物以制备缬沙坦(I)。