Copper‐Catalyzed Ring Opening of Benzofurans and an Enantioselective Hydroamination Cascade
作者:Qing‐Feng Xu‐Xu、Qiang‐Qiang Liu、Xiao Zhang、Shu‐Li You
DOI:10.1002/anie.201809003
日期:2018.11.12
A copper(II) acetate/(R)‐DTBM‐SEGPHOS‐catalyzed ring opening of benzofurans and enantioselective hydroamination cascade with dimethoxymethylsilane (DMMS) and hydroxylamine esters is described. Starting from readily available substituted benzofurans, a series of chiral N,N‐dibenzylaminophenols, which are of high interest in pharmaceutical chemistry, were obtained with excellent enantioselectivities (up
Enantioselective Synthesis of 4-Aminotetrahydroquinolines via 1,2-Reductive Dearomatization of Quinolines and Copper(I) Hydride-Catalyzed Asymmetric Hydroamination
作者:Qing-Feng Xu-Xu、Xiao Zhang、Shu-Li You
DOI:10.1021/acs.orglett.9b02034
日期:2019.7.5
1,2-reductive dearomatization of quinolines and copper(II) acetate monohydrate/(R,R)-Ph-BPE/P(p-tolyl)3-catalyzed enantioselective hydroamination sequence was developed, affording diverse 4-amino-1,2,3,4-tetrahydroquinolines with high levels of enantioselectivity in either a stepwise or one-pot fashion. Pleasingly, internal cis-cyclic alkenes, which are challenging substrates in copper hydride-catalyzed