Highly Enantioselective Copper-Catalyzed Alkylation of β-Ketoesters and Subsequent Cyclization to Spirolactones/Bi-spirolactones
作者:Qing-Hai Deng、Hubert Wadepohl、Lutz H. Gade
DOI:10.1021/ja211859w
日期:2012.2.15
Cu-catalyzed enantioselective alkylation of β-ketoesters using alcohols for in situ preparation of alkylating reagents is reported. A number of functionalized β-ketoesters containing a quaternary carbon stereocenter are obtained with up to 99% ee. The alkylation products derived from 2-substituted allylic alcohols or their corresponding iodides can then be converted to spirolactones, bi-spirolactones
报道了使用醇对 β-酮酯进行 Cu 催化的对映选择性烷基化,用于原位制备烷基化试剂。获得了许多含有季碳立体中心的官能化 β-酮酯,ee 高达 99%。然后可以将衍生自 2-取代烯丙醇或其相应碘化物的烷基化产物转化为螺内酯、双螺内酯和相关的手性目标产物。