It is an object of the present invention to provide a novel and advantageous process for commercially preparing of indoxacarb which is racemic or enantiomerically enriched at chiral center from its amide precursor using a new catalytic system.
More particularly, it relates to an efficient method of preparation of indoxacarb which is racemic or enantiomerically enriched at chiral center from methyl-7-chloro-2,5-dihydro-2-[[[(4-tritluoromethoxy)phenyl]amino]carbonyl]-indeno[1,2-e][1,3,4]oxadiazine-4a(3H) carboxylate represented as formula (I) using methoxycarbonylation agent and metal salt of methylsulfinylmethylide in hydrocarbon solvent in the presence of organic base and phase transfer catalyst.
本发明的目的是提供一种新颖而有利的工艺,利用一种新的催化体系,从其酰胺前体中商业化制备外消旋的或手性中心对映体富集的
茚草克。
更具体地说,它涉及一种从甲基-7-
氯-2,5-二氢-2-[[[(4-三
氟甲氧基)苯基]
氨基]羰基]-
茚并[1、2-e][1,3,4]恶二嗪-4a(3H)
羧酸甲酯的手性中心富集。