Asymmetric Reductive Amination/Ring-Closing Cascade: Direct Synthesis of Enantioenriched Biaryl-Bridged NH Lactams
作者:Yao Zhang、Yun-Qi Liu、Le’an Hu、Xumu Zhang、Qin Yin
DOI:10.1021/acs.orglett.0c02282
日期:2020.8.21
here a Ru-catalyzed enantioselective synthesis of biaryl-bridged NH lactams through asymmetric reductive amination and a spontaneous ring-closing cascade from keto esters and NH4OAc with H2 as reductant. The reaction features broad substrate generality and high enantioselectivities (up to >99% ee). To showcase the practical utility, a highly enantioselective synthesis of 5-ethylindolobenzazepinone C, a
我们在此报告了通过不对称还原胺化和酮酯和 NH 4 OAc 以 H 2作为还原剂的自发闭环级联反应,Ru 催化的对映选择性合成联芳基桥连 NH 内酰胺。该反应具有广泛的底物通用性和高对映选择性(高达> 99% ee)。为了展示实用性,快速完成了 5-乙基吲哚苯并氮杂酮C的高度对映选择性合成,这是一种很有前途的抗有丝分裂剂。此外,产品中的酰胺基团可以通过定向 C-H 功能化进行多种加工。