申请人:BASF Aktiengesellschaft
公开号:US04659837A1
公开(公告)日:1987-04-21
A process for the preparation of 1,3-disubstituted 4,5-cis-dicarboxy-2-imidazolidones useful as intermediates in the preparation of Vitamin H (biotin), said intermediates have the general formula ##STR1## in which R is an aliphatic hydrocarbon radical having 1 to 8 carbon atoms, an aralkyl radical or an aromatic hydrocarbon radical, preferably an allyl radical or a benzyl radical, comprising reacting a defined diaminosuccinic acid with phosgene in the presence of an alkali metal hydroxide.
一种用于制备1,3-二取代4,5-顺式二羧基-2-咪唑烷酮的方法,该方法可作为维生素H(生物素)制备中间体,所述中间体具有一般式##STR1##其中R是具有1至8个碳原子的脂肪烃基、芳基烃基或芳香烃基,最好是烯丙基或苄基,包括在碱金属氢氧化物存在下将定义的二氨基琥珀酸与光气反应。