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.
The Importance of 1,5‐Oxygen⋅⋅⋅Chalcogen Interactions in Enantioselective Isochalcogenourea Catalysis
作者:Claire M. Young、Alex Elmi、Dominic J. Pascoe、Rylie K. Morris、Calum McLaughlin、Andrew M. Woods、Aileen B. Frost、Alix Houpliere、Kenneth B. Ling、Terry K. Smith、Alexandra M. Z. Slawin、Patrick H. Willoughby、Scott L. Cockroft、Andrew D. Smith
DOI:10.1002/anie.201914421
日期:2020.2.24
5-O⋅⋅⋅chalcogen (Ch) interactions in isochalcogenourea catalysis (Ch=O, S, Se) is investigated. Conformational analyses of N-acyl isochalcogenouronium species and comparison with kinetic data demonstrate the significance of 1,5-O⋅⋅⋅Ch interactions in enantioselective catalysis. Importantly, the selenium analogue demonstrates enhanced rate and selectivity profiles across a range of reaction processes including
Evaluating polymer-supported isothiourea catalysis in industrially-preferable solvents for the acylative kinetic resolution of secondary and tertiary heterocyclic alcohols in batch and flow
作者:Nitul Ranjan Guha、Rifahath M. Neyyappadath、Mark D. Greenhalgh、Ross Chisholm、Samuel M. Smith、Megan L. McEvoy、Claire M. Young、Carles Rodríguez-Escrich、Miquel A. Pericàs、Georg Hähner、Andrew D. Smith
DOI:10.1039/c8gc02020e
日期:——
acylative kinetic resolution of secondary and tertiary heterocyclic alcohols. In batch, the use of industrially-preferable solvents was investigated, with dimethyl carbonate proving to be most generally-applicable. Significantly, the HyperBTM-derived immobilised catalysts were readily recycled, with no loss in either activity or selectivity. In addition to the kinetic resolution of secondary benzylic, propargylic
Regio- and Diastereoselective CC Coupling of α-Olefins and Styrenes to 3-Hydroxy-2-oxindoles by Ru-Catalyzed Hydrohydroxyalkylation
作者:Eiji Yamaguchi、Jeffrey Mowat、Tom Luong、Michael J. Krische
DOI:10.1002/anie.201303552
日期:2013.8.5
The direct approach: Ruthenium(0)‐catalyzed hydrohydroxyalkylation of α‐olefins and styrenes with 3‐hydroxy‐2‐oxindoles forms branched products of CCcoupling with high levels of diastereocontrol. A mechanism involving diene–olefin oxidative coupling and a subsequent carboxylic acid co‐catalyzed transfer hydrogenolysis of the resulting oxaruthenacycle intermediate is postulated.
Facile regiospecific synthesis of 2,3-disubstituted indoles from isatins
作者:Xiaowei Dou、Weijun Yao、Shan Wen、Yixin Lu
DOI:10.1039/c4cc04555f
日期:——
A facile regiospecific synthesis of 2,3-disubstituted indolesfromisatins has been developed. Nucleophilic addition of Grignard reagents to commercially available isatins, followed by reduction with borane, afforded an array of structurally diverse 2,3-disubstituted indoles in moderate to good yields. The method described herein represents a novel and very simple approach to synthesize various 2,3-disubstituted