The present invention relates to an improved process for the preparation of 7-[4[-(2,3-dichlorophenyl) -1-piperazinyl]butoxy]3,4-dihydro-2-(1H) quinolinone (Aripiprazole) having dimer impurity less than 0.15%, particularly, the present invention relates to an improved process for the preparation of 7-(4-chlorobutoxy)-3,4-dihydrocarbostyril of formula (I) having dimer impurity less than 0.5%
comprising a step of, reacting 7-hydroxy-tetrahydroquinolinone of formula (III)
with 1-bromo-4-chlorobutane in the presence of a base in a solvent.
本发明涉及一种改进的制备7-[4[-(2,3-二
氯苯基) -1-
哌嗪基]丁氧基] 3,4-二氢-2-(1H)
喹啉酮(Aripiprazole)的过程,其二聚物杂质小于0.15%,特别是,本发明涉及一种改进的制备式(I)的7-(4-
氯丁氧基)-3,4-二氢-
喜树碱的过程,其二聚物杂质小于0.5%,包括在溶剂中用碱反应式(III)的7-羟基
四氢喹啉酮和
1-溴-4-氯丁烷。