Catalytic Enantioselective Synthesis of Chiral Phthalides by SmI<sub>2</sub>-Mediated Reductive Cyclization of 2-Acylarylcarboxylates
作者:Ling-Lin Huang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ja061114z
日期:2006.5.1
A significant new and efficient catalytic asymmetric approach for the highly enantioselective synthesis of chiral phthalides by SmI2-induced reductive cyclization of 2-acylarylcarbonylates was developed. The combination of (4S,5R)-4,5-diphenyloxazolidin-2-one and 2,2,6,6-tetramethylpiperidine was found to be a very effective catalyst system in the reaction. This method provides a ready access to a
开发了一种重要的新型高效催化不对称方法,用于通过 SmI2 诱导的 2-酰基芳基羰基化物的还原环化反应高度对映选择性合成手性苯酞。发现 (4S,5R)-4,5-二苯基恶唑烷-2-one 和 2,2,6,6-四甲基哌啶的组合是该反应中非常有效的催化剂体系。该方法可方便地获取各种富含对映异构体的邻苯二甲酸酯(高达 99% ee)。