Oxidative activation of dihydropyridine amides to reactive acyl donors
作者:Erik Daa Funder、Julie B. Trads、Kurt V. Gothelf
DOI:10.1039/c4ob01931h
日期:——
4-dihydropyridine (DHP) are activated by oxidation for acyltransfer to amines, alcohols and thiols. In the reduced form the DHP amide is stable towards reaction with amines at room temperature. However, upon oxidation with DDQ the acyl donor is activated via a proposed pyridinium intermediate. The activated intermediate reacts with various nucleophiles to give amides, esters, and thio-esters in moderate