established. A range of optically pure γ-butyrolactams bearing two vicinal tetrasubstituted carbon stereocenters were obtained in high yields with good to excellent stereoselectivities (up to 99% yield, 99:1 dr, and 99% ee). This is the first example of asymmetric synthesis γ-butyrolactams containing sterically congested vicinal tetrasubstituted stereocenters via a decarboxylative cyclization pathway.
已经建立了
铜催化的
炔烃取代的环状
氨基甲酸酯与吖内酯的非对映和对映选择性脱羧 [3 + 2] 环化反应。一系列带有两个邻位四取代碳立构中心的光学纯 γ-丁内酰胺以高产率和良好至极好的立体选择性(高达 99% 产率、99:1 dr 和 99% ee)获得。这是第一个通过脱羧环化途径不对称合成含有空间拥挤的邻位四取代立构中心的 γ-丁内酰胺的例子。