A novel chiral zirconium catalyst for enantioselective aldol and Mannich-type reactions. Catalytic activation of both aldehydes and imines using a similar chiral Lewis acid
作者:Shū Kobayashi、Haruro Ishitani、Yasuhiro Yamashita、Masaharu Ueno、Haruka Shimizu
DOI:10.1016/s0040-4020(00)01038-3
日期:2001.1
A novel zirconium catalyst has been developed for asymmetric aldol reaction of aldehydes with silyl enolates and asymmetric Mannich reactions of imines with silyl enolates. Similar types of catalysts have been successfully used in both reactions, and the desired products were obtained in high yields and high selectivities. For the sense of the chiral induction, reverse enantiofacial selectivities were
已经开发出一种新型的锆催化剂,用于醛与甲硅烷基烯醇酸酯的不对称羟醛反应和亚胺与甲硅烷基烯醇酸酯的不对称曼尼希反应。相似类型的催化剂已成功用于两个反应中,并且以高收率和高选择性获得了所需的产物。就手性诱导的意义而言,在醛醇缩合反应和曼尼希反应之间观察到相反的对面选择性。