Iridium-Catalyzed Regioselective and Enantioselective Allylation of Trimethylsiloxyfuran
作者:Wenyong Chen、John F. Hartwig
DOI:10.1021/ja306850b
日期:2012.9.19
We report the regio- and enantioselective allylation of an ester enolate, trimethylsiloxyfuran. This enolate reacts at the 3-position with linear aromatic allylic carbonates or aliphatic allylic benzoates to form the branched substitution products in the presence of a metallacyclic iridium catalyst. This process provides access to synthetically important 3-substituted butenolides in enantioenriched
我们报告了酯烯醇三甲基甲硅烷氧基呋喃的区域和对映选择性烯丙基化。该烯醇化物在金属环铱催化剂的存在下在 3 位与直链芳族烯丙基碳酸酯或脂族烯丙基苯甲酸酯反应形成支链取代产物。该过程提供了获得对映体富集形式的合成上重要的 3-取代丁烯内酯的途径。烯丙基铱中间体的化学计量反应表明三甲基甲硅烷氧基呋喃被羧酸盐离去基团活化。