Dual Brønsted Acid/Nucleophilic Activation of Carbonylimidazole Derivatives
作者:Stephen T. Heller、Tingting Fu、Richmond Sarpong
DOI:10.1021/ol300339q
日期:2012.4.20
Carbonylimidazole derivatives have been found to be highly active acylation reagents for esterification and amidation in the presence of pyridinium salts. These reactions are thought to involve both Bronsted acid and nucleophilic catalysis. This mode of activation has been applied to the synthesis of difficult to access oxazolidinones, as well as esters and amides. Finally, the use of pyridinium salts has been shown to accelerate the esterification of carboxylic acids with imidazole carbamates.