Highly Enantioselective Synthesis of Chiral γ-Lactams by Rh-Catalyzed Asymmetric Hydrogenation
作者:Qiwei Lang、Guoxian Gu、Yaoti Cheng、Qin Yin、Xumu Zhang
DOI:10.1021/acscatal.8b00827
日期:2018.6.1
a (ZhaoPhos) catalytic system has been identified for the straightforward asymmetric synthesis of chiral γ-lactams. A variety of NH free α,β-unsaturated lactams bearing a β-aryl or β-alkyl substituent were smoothly hydrogenated to provide the desired γ-lactams in up to 99% yield and 99% enantiomeric excess (ee). This methodology provides a highly practical pathway to synthesize chiral γ-lactams or
Rh /双膦-硫脲(ZhaoPhos)催化体系已被确定用于手性γ-内酰胺的直接不对称合成。将各种带有β-芳基或β-烷基取代基的无NH的α,β-不饱和内酰胺平滑氢化,以提供所需的γ-内酰胺,产率高达99%,对映体过量(ee)高达99%。该方法提供了合成手性γ-内酰胺或γ-氨基酸的高度实用的途径。