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    • 6. 发明授权
    • Process for the preparation of imidazopyridines
    • 咪唑并吡啶的制备方法
    • US5321137A
    • 1994-06-14
    • US102175
    • 1993-08-04
    • Werner MederskiHeinz-Hermann Bokel
    • Werner MederskiHeinz-Hermann Bokel
    • A61K31/435A61K31/44A61P9/12A61P43/00C07D471/04C07D213/75
    • C07D471/04
    • The invention relates to a novel process for the preparation of imidazopyridines of formula I: ##STR1## in which R is an alkyl having 1-6 C atoms, characterized in that 3,4-diamino-2-chloropyridine (II) is reacted with an acid anhydride of the formula RCO--O--COR 40 (III), in which R is as defined and R' is R or can be another aliphatic or aromatic radical, to give a 4-amino-2-chloro-3-R-CO-aminopyridine (IV), this is converted with 4'-bromomethyl-2-cyanobiphenyl (V), in the presence of an alkali metal alcoholate in an inert solvent, to a 4-amino-2-chloro-3-R-CO-[N-(2'-cyano-biphenyl-4-ylmethyl)-amino]pyridine (VI) and this is treated with a strong acid, a 2-R-4-chloro-3-(2'-cyano-biphenyl-4-ylmethyl)-3H-imidazo[4,5-c]pyridine (VII) being formed as an intermediate.
    • 本发明涉及制备式I的咪唑并吡啶的新方法:其中R是具有1-6个C原子的烷基,其特征在于3,4-二氨基-2-氯吡啶(II)反应 与式RCO-O-COR 40(III)的酸酐反应,其中R如上所定义,R'是R或可以是其它脂族或芳族基团,得到4-氨基-2-氯-3- 将R-CO-氨基吡啶(Ⅳ)在惰性溶剂中,在碱金属醇盐存在下,用4-溴甲基-2-氰基联苯(Ⅴ)转化成4-氨基-2-氯-3- R-CO- [N-(2'-氰基 - 联苯-4-基甲基) - 氨基]吡啶(Ⅵ),用强酸,2-R-4-氯-3-(2'- 氰基 - 联苯-4-基甲基)-3H-咪唑并[4,5-c]吡啶(VII)。