There have been many reports of Mannich-type condensation reactions involving carboxamides as the acidic~ omponent'.~. In contrast, the use of carboxamides as the amine component is subject to a number of limitations and usually the desired amidomethylation products are obtained only via isolation of N-(hydroxymethyl) carboxamides4. However, carboxamides do react as the amine component with sulfinic acids and aldehydes leading ...