Direct Synthesis of Chiral Allenoates from the Asymmetric CH Insertion of α-Diazoesters into Terminal Alkynes
作者:Yu Tang、Quangang Chen、Xiaohua Liu、Gang Wang、Lili Lin、Xiaoming Feng
DOI:10.1002/anie.201501918
日期:2015.8.10
The asymmetric CH insertion of α‐diazoesters into 1‐alkynes was achieved using chiral cationic guanidinium salts and copper(I) complexes. Optically active 2,4‐disubstituted allenoates were generated under mild reaction conditions from various α‐diazoesters and 1‐alkynes in high yield (up to 99 %) and enantioselectivity (up to 97:3 e.r.). Control experiments excluded the possibility of an asymmetric
不对称Ç Hα-diazoesters成1-炔烃使用手性阳离子胍盐和铜(I)配合物达到的插入。在温和的反应条件下,由各种α-重氮酸酯和1-炔烃以高产率(最高99%)和对映选择性(最高97:3 er)生成旋光的2,4-二取代的脲酸酯。对照实验排除了炔酸酯不对称异构化的可能性。