A Facile Method for the Preparation of Unsymmetrical Ureas Utilizing Zirconium(IV) Chloride
作者:Anna Lee、Hee-Kwon Kim、David H. Thompson
DOI:10.1002/bkcs.10646
日期:2016.2
ureas from amines is described. Carbamoyl imidazole compounds were prepared by the reaction of 1,1‐carbonyldiimidazole with primary or secondary amines, and further activation by treatment with zirconium(IV) chloride to generate the desired urea. This reaction protocol was applied to the synthesis of tri and tetrasubstituted ureas with high yields. This study provides an alternative guideline for the
描述了一种由胺制备不对称脲的简便合成方法。氨基甲酰基咪唑化合物的制备方法是:1,1-羰基二咪唑与伯胺或仲胺反应,然后通过氯化锆(IV)处理进一步活化,生成所需的尿素。该反应方案被用于高产率地合成三和四取代的脲。这项研究为各种不对称脲的实际制备提供了另一种指导方针。