Highly Diastereo- and Enantioselective Vinylogous Mannich Reactions of Fluorinated Aldimines with Siloxyfurans
作者:Qian-Yi Zhao、Zhi-Liang Yuan、Min Shi
DOI:10.1002/adsc.201000843
日期:2011.3.7
A highly regio‐ and enantioselective asymmetric vinylogous Mannich reaction of readily available fluorinated aldimines bearing a chiral auxiliary [(S)‐1‐phenylethyl group] with siloxyfurans to afford chiral fluorine‐containing γ‐butenolide or γ‐lactone derivatives has been developed in the presence of silver acetate (10 mol%) and axially chiral phosphine‐oxazoline ligand L1 (11 mol%). In most cases
现已开发出具有手性助剂[(S)-1-苯乙基]的氟化亚胺与甲硅烷氧基呋喃的高度区域和对映选择性不对称乙烯基曼尼希反应,可制得手性含氟的γ-丁烯内酯或γ-内酯衍生物。存在乙酸银(10 mol%)和轴向手性膦-恶唑啉配体L1(11 mol%)。在大多数情况下,以高收率,良好至优异的对映体过量和高达> 20:1 dr的产率获得相应的氟化加合物。