申请人:Egis Gyogyszergyar
公开号:US05155260A1
公开(公告)日:1992-10-13
The invention relates to an improved process for the preparation of 2,2-dimethyl-5-(2,5-dimethylphenoxy)-pentanoic acid of Formula (I) ##STR1## which comprises reacting an ester of the general Formula (X) ##STR2## wherein X represents halogen and Z stands for a straight or branched chain C.sub.1-8 alkylene group optionally substituted by one or two 2,2-dimethyl-5-halopentanoyloxy group(s), wherein halo represents chlorine or bromine, and in which alkylene group one or two methylene group(s) may be optionally replaced either by hetero atom(s) or by a bivalent heterocyclic group--with an alkali salt of 2,5-dimethylphenol of Formula (II) ##STR3## or with an ester of the latter formed with a lower alkanoic acid, and hydrolizing the aryloxy-substituted ester of the general Formula (XI) thus obtained. Furthermore the invention relates to intermediate compounds of the general Formula (X), wherein X and Z are as stated above, and to a process for the preparation thereof.
本发明涉及一种改进的制备2,2-二甲基-5-(2,5-二甲基苯氧基)戊酸(式(I))的方法,其包括将一般式(X)的酯与2,5-二甲基苯酚的碱盐或者与后者形成的低级脂肪酸酯反应,其中X代表卤素,Z代表直链或支链的C.sub.1-8烷基,可选地被一或两个2,2-二甲基-5-卤代戊酰氧基取代,其中卤代氯或溴,在该烷基中,一或两个亚甲基可以被异原子或双价杂环基取代,然后水解得到一般式(XI)的芳氧基取代酯。此外,本发明还涉及一般式(X)的中间体化合物,其中X和Z如上所述,以及其制备方法。