Chiral Phosphoric Acid-Catalyzed Desymmetrization of meso-Aziridines with Functionalized Mercaptans
摘要:
Conditions for the phosphoric acid-catalyzed highly enantioselective ring-opening of meso-aziridines with a series of functionalized aromatic thiol nucleophiles are described. The procedure utilizes commercially available aromatic thiols, a series of meso-aziridines, and a catalytic amount of VAPOL phosphoric acid to explore the substrate scope of this highly enantioselective reaction.
Guanidine-catalyzed enantioselective desymmetrization of meso-aziridines
作者:Yan Zhang、Choon Wee Kee、Richmond Lee、Xiao Fu、Julian Ying-Teck Soh、Esther Mun Foong Loh、Kuo-Wei Huang、Choon-Hong Tan
DOI:10.1039/c0cc05840h
日期:——
An amino-indanol derived chiral guanidine was developed as an efficient Brønsted base catalyst for the desymmetrization of meso-aziridines with both thiols and carbamodithioic acids as nucleophiles, which provided 1,2-difunctionalized ring-opened products in high yields and enantioselectivities.
Highly Enantioselective Synthesis of β-Amidophenylthioethers by Organocatalytic Desymmetrization of <i>meso</i>-Aziridines
作者:Giorgio Della Sala、Alessandra Lattanzi
DOI:10.1021/ol901209n
日期:2009.8.6
The desymmetrization of N-acylaziridines with Me3SiSPh, catalyzed by commercially available (R) and (S)-VAPOL hydrogen phosphate, produced beta-(N-acylamino)phenylthioethers in a highly enantioselective and efficient manner (78-99% ee). The selection of the suitable aziridine/nucleophile/catalyst molar ratio is crucial to obtain high ee's.