Aminothiocarbamate-Catalyzed Asymmetric Bromolactonization of 1,2-Disubstituted Olefinic Acids
作者:Chong Kiat Tan、Ling Zhou、Ying-Yeung Yeung
DOI:10.1021/ol200840e
日期:2011.5.20
An efficient and enantioselectivebromolactonization of 1,2-disubstituted olefinicacids using an amino-thiocarbamate catalyst has been developed, resulting in the formation of δ-lactones containing two chiral centers with up to 99% yield, 95% ee.
Studies on Thiourea Catalysed Bromocycloetherification and Bromolactonisations
作者:Venkatachalam Pitchumani、David W. Lupton
DOI:10.1071/ch20184
日期:——
Lewis base catalysed halofunctionalisation reactions of alkenes are well established and allow access to, among others, various oxygen containing heterocycles. By exploiting the known conversion of N-heterocyclic carbenes into the corresponding thioureas it has been possible to prepare and study a range of chiral and non-chiral Lewis base catalysts for such reactions. Although all thiourea catalysts