Copper-catalyzed enantioselective addition of alcohols to isatin-derived ketimines
作者:Jian Lu、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tetlet.2019.03.049
日期:2019.4
The first copper-catalyzed enantioselectiveaddition of alcohols to imines was described. In the presence of 1 mol% Cu(OAc)2 complexed with chiral cyclohexane-based N,P-ligand L4, chiral isatin-derived N,O-aminals were obtained in excellent yields (93–99%) and good-to-excellent enantioselectivities (up to 93% ee) under mild conditions.
The Quinine Thiourea-Catalyzed Asymmetric Strecker Reaction: An Approach for the Synthesis of 3-Aminooxindoles
作者:Dong Wang、Jinyan Liang、Jingchao Feng、Kairong Wang、Quantao Sun、Long Zhao、Dan Li、Wenjin Yan、Rui Wang
DOI:10.1002/adsc.201200630
日期:2013.1.9
An organocatalytic enantioselective Streckerreaction for the synthesis of 3-amino-3-cyanooxindoles has been developed. Employing a quinine-derived thiourea catalyst, the nucleophilic addition of trimethylsilyl cyanide to N-Boc-ketimines affords 3-amino-3-canooxindoles in good to excellent yields (78–98%) and very good enantioselectivities (up to 94%). Furthermore, to the best of our knowledge, this
Facile Synthesis of Quinoline-Substituted 3-Hydroxy-2-oxindoles and 3-Amino-2-oxindoles via a Palladium-Catalyzed Cascade Intramolecular Cyclization/Intermolecular Nucleophilic Addition Reaction
An efficient cascade intramolecular cyclization/intermolecular nucleophilic addition reaction of allenyl benzoxazinone with isatin or isatin-derived ketimine has been established by using Pd0-π-Lewis base catalysis. A series of 3-hydroxy-2-oxindoles and 3-amino-2-oxindoles with quaternary carbon atoms at the C3 position were synthesized in good yields under mild conditions through this protocol.