Rhodium-Catalyzed Regiodivergent and Enantioselective Hydroboration of Enamides
作者:Xiao-Yan Bai、Wei Zhao、Xin Sun、Bi-Jie Li
DOI:10.1021/jacs.9b10578
日期:2019.12.18
through rhodium-catalyzed regiodivergent and enantioselective hydroboration of enamides. Catalytic asymmetric synthesis of α- and β-aminoboronic esters with high regio-, diastereo-, and enantioselectivities were achieved through effective catalyst control and tuning substrate geometry. Starting from easily available materials, this strategy provides a unified synthetic access to both enantioenriched
selected cyclopropanes as model substrates since they present a relatively weak σ-bond. Herein, we describe an iridium-catalyzed hydroboration of cyclopropanes, resulting in β-methyl alkylboronates. These unusually branched boronates can be derivatized by oxidation or cross-coupling chemistry, accessing "designer" products that are desired by practitioners of natural product synthesis and medicinal chemistry