作者:Manjinder Gill、Dinesh Tanwar、Anjali Ratan
DOI:10.1055/s-0036-1588468
日期:2017.10
A novel and simple approach for the preparation of 3-substituted, 5-substituted, or 3,5-disubstituted hydantoins is reported. It involves the reaction of α-amino methyl ester hydrochlorides with carbamates to yield the corresponding ureido derivatives, which subsequently cyclize under basic conditions to produce substituted hydantoins in good yields. By applying this method, the bioactive anticonvulsant
报道了一种制备 3-取代、5-取代或 3,5-二取代乙内酰脲的新颖且简单的方法。它涉及 α-氨基甲酯盐酸盐与氨基甲酸酯反应生成相应的脲基衍生物,随后在碱性条件下环化以高产率生成取代的乙内酰脲。应用该方法合成了生物活性抗惊厥药物乙妥英,收率良好。该过程避免了传统的多步骤方案,并且不使用通常用于合成这些重要化合物的危险、刺激性、有毒或对水分敏感的试剂,如异氰酸酯或氯甲酸酯。