Aryloxide-Facilitated Catalyst Turnover in Enantioselective α,β-Unsaturated Acyl Ammonium Catalysis
作者:Anastassia Matviitsuk、Mark D. Greenhalgh、Diego-Javier Barrios Antúnez、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1002/anie.201706402
日期:2017.9.25
β-unsaturated p-nitrophenyl ester substrate to facilitate catalyst turnover. This method was used for the enantioselective isothiourea-catalyzed Michael addition of nitroalkanes to α,β-unsaturated p-nitrophenyl esters in generally good yield and with excellent enantioselectivity (27 examples, up to 79 % yield, 99:1 er). Mechanistic studies identified rapid and reversible catalyst acylation by the α,β-unsaturated