Chemical process for the preparation of esters of substituted cyclopropyl caboxylic acids
申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0251466A3
公开(公告)日:1989-05-03
A process for the preparation of a compound of the general formula (III):
wherein R¹, R², R⁵ and R⁶ each represent a hydrogen atom or an alkyl group containing from l to 4 carbon atoms, R is an alkyl group and X and Y each represent a hydrogen atom, a halogen atom or an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, aralkyl, alkoxy or aryloxy group, the process comprising the elimination of the molecule HZ, with a simultaneous ring closure, from a compound of the general formula (IV):
wherein R¹, R², R⁵ and R⁶ R, X and Y have the same meanings as before and Z is a leaving group, for example a chlorine or bromine atom or a tosylate or mesylate group.
制备一般式(III)化合物的过程:
其中R¹、R²、R⁵和R⁶分别代表氢原子或含有1至4个碳原子的烷基基团,R为烷基基团,X和Y分别代表氢原子、卤原子或烷基、环烷基、烯基、炔基、芳基、芳基烷基、烷氧基或芳氧基,该过程包括从一般式(IV)化合物中消除分子HZ,并同时进行环闭合,其中R¹、R²、R⁵和R⁶、R、X和Y的含义与之前相同,Z是一个离去基团,例如氯或溴原子或对甲苯磺酸基或甲磺酸基。