Enantio- and Diastereoselective Vinylogous Mukaiyama Aldol Reactions of α-Keto Phosphonates with 2-(Trimethylsilyloxy)- furan Catalyzed by Bis(oxazoline)-Copper Complexes
作者:Gang Hou、Jipan Yu、Chengbin Yu、Guiping Wu、Zhiwei Miao
DOI:10.1002/adsc.201200810
日期:2013.1.9
The asymmetric vinylogous Mukaiyama aldol reaction between α-keto phosphonate and 2-(trimethylsilyloxy)furan was performed by using bis(oxazoline)-copper complexes as the catalyst and 2,2,2-trifluoroethanol as additive in dichloromethane. The present method is highly tolerable for functionalized α-keto phosphonates and enabled us to obtain the corresponding 3- and 4-substituted benzyl-functionalized
以双(恶唑啉)-铜络合物为催化剂,以2,2,2-三氟乙醇为添加剂,在二氯甲烷中进行α-酮膦酸酯与2-(三甲基甲硅烷氧基)呋喃的不对称乙烯基Mukaiyama aldol反应。本方法对官能化的α-酮膦酸酯具有很高的耐受性,使我们能够以高收率(高达86%)和高对映体选择性(高达90%)获得相应的3-和4-取代的苄基官能化的叔α-羟基膦酸酯。 98%ee)和非对映选择性(最高达99:1,抗选择性)。