Catalytic Asymmetric β-C–H Functionalizations of Ketones via Enamine Oxidation
作者:Lihui Zhu、Long Zhang、Sanzhong Luo
DOI:10.1021/acs.orglett.8b00508
日期:2018.3.16
A chiral primary amine catalyzed oxidative β-C–H functionalization of ketone is described. The reaction proceeds via ketone enamine oxidation by IBX and enables highly enantioselective remote C–H functionalization of both cyclic and acyclic ketones, generating chiral ketones bearing β-stereocenters.
A facile in situ formed primary amine-imine organocatalyst was developed in the asymmetric Michael addition of substituted 4-hydroxycoumarins to cyclic enones. A series of optically active polycyclic coumarinderivatives were obtained in high yields with excellent enantioselectivities up to 97% ee.