Kinetic Resolution of Tertiary Alcohols: Highly Enantioselective Access to 3-Hydroxy-3-Substituted Oxindoles
作者:Shenci Lu、Si Bei Poh、Woon-Yew Siau、Yu Zhao
DOI:10.1002/anie.201209043
日期:2013.2.4
Enantioselective: The first highlyenantioselectivekineticresolution of 3‐hydroxy‐3‐substituted oxindoles has been developed through oxidative esterification catalyzed by a N‐heterocyclic carbene (see picture). This method uses a simple procedure and provides 3‐hydroxy‐oxindoles with various substituents at the 3‐position in excellent enantiopurity. S=selectivity.
Synthesis of Novel Enantiopure Biphenyl <i>P</i>,<i>N-</i>Ligands and Application in Palladium-Catalyzed Asymmetric Addition of Arylboronic Acids to <i>N-</i>Benzylisatin
作者:Hongshan Lai、Zhiyan Huang、Qiong Wu、Yong Qin
DOI:10.1021/jo802036m
日期:2009.1.2
Enantiopure tetra-ortho-substituted biphenyl phosphinoimine ligands (Ra,S)-3 and (Sa,S)-3 were synthesized via multistep reactions. The first asymmetric addition reactions of arylboronic acids to N-benzylisatin catalyzed by Pd(OAc)2 and (Ra,S)-3 were studied to provide 3-aryl-3-hydroxyoxindoles in moderate yields and enantioselectivities.