[EN] A PROCESS FOR THE PREPARATION OF ESERETHOLE<br/>[FR] PROCEDE DE PREPARATION D'ESERETHOL
申请人:LABORATORIO CHIMICO INTERNAZIONALE S.P.A.
公开号:WO1993024455A1
公开(公告)日:1993-12-09
(EN) A process for the preparation of 1,3-dimethyl-5-hydroxy-oxindole of formula (II) which comprises the reaction of 4-(N-methylamino)phenol with 2-halogen-propinol chloride and cyclization of the resulting compound in the presence of Lewis acids, and the conversion thereof to eserethole.(FR) Procédé de préparation de 1,3-diméthyl-5-hydroxy-oxindole de la formule (II), consistant en la réaction de 4-(N-méthylamino)phénole avec du chlorure de 2-halogène-propionyle, et en la cyclisation du composé obtenu en présence d'acides de Lewis, et sa conversion en éséréthol.
Process for the Preparation of Eserethole
申请人:Laboratorio Chimico Internazionale S.p.A.
公开号:US05519144A1
公开(公告)日:1996-05-21
Eserethole of formula ##STR1## is prepared from 1,3-dimethyl-5-hydroxy-oxindole compound II which is acylated in the first step to obtain 1,3-dimethyl-5-acyloxyoxindole (III). The product is reacted with chloroacetonitrile to obtain 1,3-dimethyl-3-cyanomethyl-5-acyloxy-oxindole (IV). The 5-acyloxy group is hydrolyzed and the hydroxy group is ethoxylated with ethyl halides or sulfate. Then the product is cyclized by treatment with sodium bis-(methoxy-ethoxy)aluminum hydride, to give O-ethyl-nor-eseroline (VI) and the compound is methylated to give eserethole (VII).