Rhodium(<scp>iii</scp>)-catalyzed asymmetric [4+1] spiroannulations of <i>O</i>-pivaloyl oximes with α-diazo compounds
作者:Lincong Sun、Bingxian Liu、Yanlian Zhao、Junbiao Chang、Lingheng Kong、Fen Wang、Wei-Qiao Deng、Xingwei Li
DOI:10.1039/d1cc02888j
日期:——
Chiral RhIII catalysts can catalyze the asymmetric [4+1] spiroannulation of O-pivaloyl oximes with α-diazo homophthalimides under redox-neutral and acid/base-neutral conditions, leading to formation of chiral spirocyclic imines as a result of C–H activation and N–O cleavage. The reaction proceeded with high efficiency and features broad substrate scope, mild reaction conditions, and high to excellent
Redox-Neutral Access to Isoquinolinones via Rhodium(III)-Catalyzed Annulations of <i>O</i>-Pivaloyl Oximes with Ketenes
作者:Xifa Yang、Song Liu、Songjie Yu、Lingheng Kong、Yu Lan、Xingwei Li
DOI:10.1021/acs.orglett.8b00906
日期:2018.5.4
A mild and redox-neutral [4 + 2] annulation of O-pivaloyl oximes with ketenes has been realized for synthesis of quaternary-carbon-stereocenter-containing (QCSC) isoqui-nolinones, where the N-OPiv not only acts as an oxidizing group but also offers coordination saturation to inhibit protonolysis. The reaction mechanism has been studied by DFT calculations.