申请人:Warner-Lambert Company
公开号:US06121491A1
公开(公告)日:2000-09-19
Process for the preparation of cericlamine which consists: i) in arylating methacrylic acid with the diazonium chloride of 3,4-dichloroaniline, to obtain (+/-)2-chloro-3-(3,4-dichlorophenyl)-2-methylpropionic acid, ii) in aminating the acid with dimethylamine, to obtain (+/-)3-(3,4-dichlorophenyl)-2-dimethylamino-2-methylpropionic acid, or an alkaline metal salt thereof, iii) in esterifying the amino-acid or its salt, then, iv) in reducing the ester by a metal or organometal hydride to obtain (+/-)3-(3,4-dichlorophenyl)-2-dimethylamino-2-methyl-propan-1-ol.
制备cericlamine的过程包括:i)用3,4-二氯苯胺的重氮盐与甲基丙烯酸偶联,得到(+/-)2-氯-3-(3,4-二氯苯基)-2-甲基丙酸,ii)用二甲胺使酸胺化,得到(+/-)3-(3,4-二氯苯基)-2-二甲基氨基-2-甲基丙酸或其碱金属盐,iii)酸胺化物或其盐酯化,然后,iv)用金属或有机金属氢化物还原酯,得到(+/-)3-(3,4-二氯苯基)-2-二甲基氨基-2-甲基-1-丙醇。