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,作为自由碱基或盐,用于分离d-2-氨基-1-丁醇,用于合成乙胺丁醇盐酸盐,d,d'-2,2'-(乙二胺)双-1-丁醇二盐酸盐,通过丁烯-1,腈,优选过量的乙腈和氯的反应,形成N-[1-(氯甲基)丙基]乙酰亚胺酰氯,该化合物水解为dl-2-氨基-1-丁醇盐酸盐。这可以作为盐酸盐,自由碱基或混合物分离出来,然后用L(+)-酒石酸分离d-2-氨基-1-丁醇,再用乙二氯和盐酸反应形成乙胺丁醇盐酸盐。最少的副产物可以方便地分离出来,从而实现了经济制备药品级产品。