Catalytic Asymmetric Hydroxylation of Oxindoles by Molecular Oxygen Using a Phase-Transfer Catalyst
摘要:
The highly enantioselective catalytic hydroxylation of 3-substituted oxindoles was achieved by using a phase-transfer catalyst with molecular oxygen as an oxidant. The product then was converted to an optically active compound 8, which was a synthetic precursor of alkaloid CPC-1.
Pentanidium catalyzed enantioselective hydroperoxidation of 2-oxindole using molecular oxygen
作者:Shun Zhou、Lin Zhang、Chun Li、Yuanhu Mao、Jianta Wang、Ping Zhao、Lei Tang、Yuanyong Yang
DOI:10.1016/j.catcom.2016.04.016
日期:2016.7
Pentanidium catalyzed enantioselective 3-hydroperoxidation of 2-oxindoles with molecularoxygen has been established. Various 3-hydroperoxy-2-oxindoles were achieved in good ee and yield.
Pentanidium–Catalyzed Enantioselective α-Hydroxylation of Oxindoles Using Molecular Oxygen
作者:Yuanyong Yang、Farhana Moinodeen、Willy Chin、Ting Ma、Zhiyong Jiang、Choon-Hong Tan
DOI:10.1021/ol302030v
日期:2012.9.21
Pentanidium-catalyzed alpha-hydroxylation of 3-substituted-2-oxindoles using molecular oxygen has been developed with good yields and enantioselectivities. This reaction does not require an additional reductant such as triethyl phosphite, which was typically added to reduce the peroxide intermediate. The reaction was demonstrated to consist of two-steps: an enantioselective formation of hydroperoxide oxindole and a kinetic resolution of the hydroperoxicle oxindole via reduction with enolates generated from the oxindoles.