The application of asymmetric phase‐transfer catalysis to the Strecker reaction of ketimines was realized utilizing bifunctional thiourea‐phosphonium salts. The asymmetric Strecker reaction of aldimines was also realized utilizing quaternaryammoniumsaltsderivedfrom amino acids.
Organocatalytic asymmetric cyanation of isatin derived N-Boc ketoimines
作者:Yun-Lin Liu、Jian Zhou
DOI:10.1039/c2cc36665g
日期:——
We report the first catalytic asymmetric cyanation of N-Boc ketoimines, which enables highly enantioselective synthesis of oxindole based α-amino nitriles. An unprecedented tandem aza-Wittig/Strecker reaction is also developed, emerging as a promising strategy for the catalytic asymmetric cyanation of ketoimines formed in situ from achiral ketones.
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