申请人:American Cyanamid Company
公开号:US03944617A1
公开(公告)日:1976-03-16
DL-2-Amino-1-butanol, as the free base or a salt, for resolution to 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 hydrochloride. This 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.
DL-
2-氨基-1-丁醇,作为游离碱或盐,用于分离成d-
2-氨基-1-丁醇,用于合成
乙胺丁醇盐酸盐,通过
丁烯-1,一种腈,优选过量的
乙腈和
氯的反应,形成N-[1-(
氯甲基)丙基]乙
酰亚胺氯化物,
水解为dl-
2-氨基-1-丁醇盐酸盐。这可以作为盐酸盐、游离碱或混合物分离出来,与L(+)-
酒石酸进行分离,d-
2-氨基-1-丁醇与
二氯乙烷反应,然后与
盐酸形成
乙胺丁醇盐酸盐。方便地分离出最少量的副产物,使得经济合成出药品级产品。