[EN] PREPARATION PROCESS OF AN AGONIST OF THE THROMBOPOIETIN RECEPTOR<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN AGONISTE DU RÉCEPTEUR DE LA THROMBOPOÏÉTINE
申请人:ESTEVE QUÍMICA S A
公开号:WO2014177517A1
公开(公告)日:2014-11-06
It relates to a preparation process of 2'-(benzyloxy)-3'-nitro-1,1'-biphenyl-3- carboxylic acid or a salt thereof comprising reacting 2-(benzyloxy)-1-bromo- 3-nitrobenzene with a either 3-carboxyphenylboronic acid or a salt thereof or a (C1-C4)-alkyl ester thereof in the presence of Pd(OAc)2, tricydohexylphosphine, a base, an appropriate solvent, and at an appropriate temperature; if appropriate, submitting the compound thus obtained to a hydrolysis reaction; and isolating the compound thus obtained in form of a salt of compound of formula (VI) or in form of the free acid by adding an acid. It also comprises the further preparation to eltrombopag or its salts from the new intermediate thus obtained by subsequent reduction of the nitro group and deprotection of the phenol, conversion of the amine intermediate obtained in a diazonium derivative, and either (1) subsequent reaction with ethyl acetoacetate and with (3,4-dimethylphenyl)hydrazine or a salt thereof, occurring the pyrazole ring formation by intermolecular cyclization, or (2) introduction of the pyrazole ring by reaction with 1-(3,4-dimethylphenyl)-3-methyl-3-pyrazolin-5-one.
本发明涉及一种2'-(苄氧基)-3'-硝基-1,1'-联苯基-3-羧酸或其盐的制备方法,包括在Pd(OAc)2、三环己基膦、碱、适当的溶剂和适当的温度下,将2-(苄氧基)-1-溴-3-硝基苯与3-羧基苯硼酸或其盐或(C1-C4)-烷基酯反应;如适当,将所得化合物进行水解反应;并通过加酸使所得化合物以化合物(VI)的盐的形式或以自由酸的形式分离。本发明还包括通过随后还原硝基基团和去保护酚基,将所得新中间体转化为厄洛替尼或其盐,将得到的胺中间体转化为重氮衍生物,然后通过与乙酰乙酸乙酯和(3,4-二甲基苯基)肼或其盐的反应或通过与1-(3,4-二甲基苯基)-3-甲基-3-吡唑烷-5-酮的反应引入吡唑环,进行分子间环化来形成吡唑环。