申请人:Merck & Co., Inc.
公开号:US04705892A1
公开(公告)日:1987-11-10
An improved process for preparing .alpha.,.omega.-diamino acids, such as D,L-homolysine, 2,8-diaminooctanoic acid, ornithine, lysine, or the like, comprising reaction of phthalic anhydride and an amino alcohol in a hydrocarbon solvent; treatment of the resulting phthalimide--N--(CH.sub.2).sub.n --OH derivative, without isolation thereof, with phosphorus tribromide or phosphorous pentachloride; alkylation of diethyl acetamidomalonate with the phthalimide--N--(CH.sub.2).sub.n --chloride or --bromide of the previous step, in the presence of, particularly, sodium hydride/dimethylformamide; standard acid hydrolysis and decarboxylation; selective protection via copper(II) chelation, N-specific acylation with benzyl chloroformate, and decomposition of the amino acid-copper(II) complex with alkaline thioacetamide; standard t-butoxycarbonyl acylation; and deprotection to obtain the desired .alpha.,.omega.-diamino acids.
一种改进的制备α,ω-二氨基酸(如D,L-同型赖氨酸,2,8-二氨基辛酸,鸟氨酸,赖氨酸等)的方法,包括在烃溶剂中反应邻苯二甲酸酐和氨基醇;将所得的邻苯二酰亚胺-N-(CH2)n-OH衍生物经过磷酸三溴化物或五氯化磷处理,而不进行分离;在丙酮酸二乙酯中,存在特别是氢化钠/二甲基甲酰胺的情况下,用前一步中的邻苯二酰亚胺-N-(CH2)n-氯或-溴进行烷基化;标准酸水解和脱羧作用;通过铜(II)螯合作用进行选择性保护,用苯甲酰氯进行N-特异性酰化,并用碱性硫代乙酰胺分解氨基酸-铜(II)络合物;标准的t-丁氧羰基化作用;去保护作用以获得所需的α,ω-二氨基酸。