Highly enantioselective Biginelli reaction catalyzed by a simple chiral primary amine catalyst: asymmetric synthesis of dihydropyrimidines
作者:Da-Zhen Xu、Hui Li、Yongmei Wang
DOI:10.1016/j.tet.2012.07.027
日期:2012.9
Several chiral primary amines were introduced as organocatalysts for the asymmetric Biginellireaction. The reaction was performed by using a combined catalyst consisting of a chiral bifunctional primary amine–pyridine 5j and hydrochloric acid in a mixed solvent of 1,4-dioxane/CHCl3 (8/2, v/v) at room temperature. The corresponding dihydropyrimidines were obtained in moderate to high yields with up