Borane‐Catalyzed Chemoselective and Enantioselective Reduction of 2‐Vinyl‐Substituted Pyridines
作者:Jun‐Jie Tian、Zhao‐Ying Yang、Xin‐Shen Liang、Ning Liu、Chen‐Yu Hu、Xian‐Shuang Tu、Xiang Li、Xiao‐Chen Wang
DOI:10.1002/anie.202007352
日期:2020.10.12
Herein, we report that highly chemoselective and enantioselective reduction of 2‐vinyl‐substituted pyridines has been achieved for the first time. The reaction, which uses chiral spiro‐bicyclic bisboranes as catalysts and HBpin and an acidic amide as reducing reagents, proceeds through a cascade process involving 1,4‐hydroboration followed by transfer hydrogenation of a dihydropyridine intermediate
在此,我们报道了首次实现了2-乙烯基取代吡啶的高度化学选择性和对映选择性的还原。该反应使用手性螺双环双硼烷作为催化剂,HBpin和酸性酰胺作为还原剂,通过包括1,4-氢硼化的级联过程进行,然后转移氢化二氢吡啶中间体。还原产物中保留的双键可通过简单转化将其转化为天然产物和其他有用的杂环化合物。