A General, Polymer-SupportedAcid Catalyzed Hetero-Michael Addition
作者:Jonathan B. Spencer、Tobias C. Wabnitz、Jin-Quan Yu
DOI:10.1055/s-2003-39292
日期:——
Hetero-Michael additions of nitrogen, oxygen and sulfur nucleophiles to α,β-unsaturated ketones were efficiently catalyzed by Nafion® SAC-13 perfluorinated resinsulfonic acid.
A range of internal alkynes smoothly underwent palladium-catalyzed oxidative annulations with acrylic acid and amide to afford alpha-pyrones and pyridones in good to excellent yields with high regioselectivity. The usage of O-2 (1 atm) as a stoichiometric oxidant with H2O as the only byproduct under mild conditions makes this process more attractive and practical.
A General, Brønsted Acid-Catalyzed Hetero-Michael Addition of Nitrogen, Oxygen, and Sulfur Nucleophiles
作者:Tobias C. Wabnitz、Jonathan B. Spencer
DOI:10.1021/ol034596h
日期:2003.6.1
[GRAPHICS]Strong Bronsted acids such as bis(trifluoromethariesulfon)imide catalyze the hetero-Michael addition of carbamates, alcohols, and thiols to alpha,beta-unsaturated ketones, alkylidene malonates, and acrylimides. Scope, reaction rates, and yields are superior to comparable Lewis acid-catalyzed processes.