会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明申请
    • PROCESS FOR THE PREPARATION OF ZAFIRLUKAST
    • 制备ZAFIRLUKAST的方法
    • WO0246153A2
    • 2002-06-13
    • PCT/IB0102268
    • 2001-11-30
    • ISP FINETECH LTDGUTMAN ARIENISNEVICH GENNADYZALTZMAN IGORPONOMAREV VICTORSOTRIHIN MAXIM
    • GUTMAN ARIENISNEVICH GENNADYZALTZMAN IGORPONOMAREV VICTORSOTRIHIN MAXIM
    • C07D209/18C07D209/24C07D209/00
    • C07D209/18C07D209/24Y02P20/582
    • The present invention provides a novel process for the preparation of alkyl (1-alkylindol-3-ylmethyl)benzoate derivatives which process comprises the steps of: (a) reacting of an alkyl (halomethyl)benzoate with excess of an indole, said indole being unsubstituted at positions 1-, 2- and 3-, under conditions promoting alkylation at the 3-position of the indole to yield a mixture comprising alkyl (indol-3-ylmethyl)benzoate and unreacted starting indole,(b) treating the mixture obtained in step (a) with base to yield a mixture, comprising the salt of (indol-3-ylmethyl)benzoic acid and the unreacted indole, (c) recovering the unreacted indole from the mixture obtained in step (b), and recycling the indole as starting material to step (a),(d) isolating the salt of (indol-3-ylmethyl)benzoic acid and/or acidifying the salt to form (indol-3-ylmethyl)benzoic acid, (e) reacting the (indol-3-ylmethyl)benzoic acid or it's salt with alkylating agent in the presence of base to form the desired alkyl (1-alkylindol-3-ylmethyl)benzoate. The above process affords also the preparation of the anti-asthmatic leukotriene antagonist zafirlukast. In such case, methyl 3-methoxy-4-(1-methyl-5-nitroindol-3-ylmethyl)benzoate [1a] is formed in step (e) of the process and this compound is subsequently converted into zafirlukast by known methods.
    • 本发明提供了一种制备烷基(1-烷基吲哚-3-基甲基)苯甲酸酯衍生物的新方法,该方法包括以下步骤:(a)使(卤代甲基)烷基烷基酯与过量的吲哚反应,所述吲哚为 在吲哚的3位上促进烷基化的条件下,在位置1-,2-和3-未被取代,得到包含烷基(吲哚-3-基甲基)苯甲酸酯和未反应的起始吲哚的混合物,(b)处理得到的混合物 在步骤(a)中与碱反应以产生包含(吲哚-3-基甲基)苯甲酸的盐和未反应的吲哚的混合物,(c)从步骤(b)中获得的混合物中回收未反应的吲哚,并将 吲哚作为步骤(a)的起始原料,(d)分离(吲哚-3-基甲基)苯甲酸的盐和/或酸化盐以形成(吲哚-3-基甲基)苯甲酸,(e)使 吲哚-3-基甲基)苯甲酸或其与烷基化剂的盐在碱的存在下形成所需的烷基 (1-alkylindol -3-基甲基)苯甲酸甲酯。 上述方法还提供了抗哮喘白三烯拮抗剂扎非司酮的制备。 在这种情况下,在该方法的步骤(e)中形成3-甲氧基-4-(1-甲基-5-硝基吲哚-3-基甲基)苯甲酸甲酯[1a],该化合物随后通过已知方法转化成扎非司酮。