申请人:American Cyanamid Company
公开号:US03944618A1
公开(公告)日:1976-03-16
D-2-Amino-1-butanol, for the synthesis of ethambutol hydrochloride, d,d'-2,2'-(ethylenediimino)di-1-butanol dihydrochloride, is produced in high purity and good yields by the reaction of butene-1, a nitrile, preferably an excess of acetonitrile, and chlorine to form N-[1-(chloromethyl)propyl]acetimidoyl chloride which is hydrolyzed to dl-2-amino-1-butanol, which can be isolated as the hydrochloride, or free base, or a mixture, resolved with L(+)-tartaric acid and the d-2-amino-1-butanol reacted with ethylene dichloride and then hydrochloric acid to form ethambutol hydrochloride. A minimum of by-products which are conveniently split out permits the economical synthesis of a pharmaceutical grade product.
D-2-氨基-1-丁醇,用于合成乙胺丁醇盐酸盐,d,d'-2,2'-(乙二亚胺)二-1-丁醇二盐酸盐,通过丁烯-1,一种腈,最好是过量的乙腈和氯气的反应高纯度和良好收率地生成N-[1-(氯甲基)丙基]乙酰亚胺氯化物,它被水解成dl-2-氨基-1-丁醇,可以作为盐酸盐、自由碱或混合物分离出来,用L(+)-酒石酸分离,d-2-氨基-1-丁醇与乙二氯化物反应,然后与盐酸反应形成乙胺丁醇盐酸盐。方便分离出的最少副产物使得经济合成制备药品级产品成为可能。