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.
Ruthenium-Catalyzed Alkylation of Oxindole with Alcohols
作者:Thomas Jensen、Robert Madsen
DOI:10.1021/jo900341w
日期:2009.5.15
An atom-economical and solvent-free catalytic procedure for the mono-3-alkylation of oxindole with alcohols is described. The reaction is mediated by the in situ generated catalyst from RuCl3·xH2O and PPh3 in the presence of sodium hydroxide. The reactions proceed in good to excellent yields with a wide range of aromatic, heteroaromatic, and aliphatic alcohols.
描述了用于羟吲哚与醇的单-3-烷基化的原子经济且无溶剂的催化方法。该反应由RuCl 3 · x H 2 O和PPh 3在氢氧化钠存在下原位生成的催化剂介导。使用多种芳族,杂芳族和脂族醇,反应可以以良好的收率进行,收率很高。
Bicyclic-Guanidine-Catalyzed Asymmetric Michael Addition of 3-Substituted Oxindoles to 2-Cyclopentenone
Taking the Michael: The first highly enantio‐ and diastereoselective Michael addition of various 3‐benzyl‐substituted oxindoles to 2‐cyclopentenone has been developed. A variety of 3,3‐disubstituted oxindoles as Michael adducts were obtained in 69–99 % yield with 73–98 % ee and 9:1 to >20:1 d.r.
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.
Optically active 3-sulfenyl-2-oxindoles were synthesized by a asymmetric substitution with a chiral phase-transfer catalyst. The reaction was suggested to proceed in a radical mechanism.