摘要:
The use of unsaturated isocyanides in multicomponent reactions leads to N-vinylamides, which can be cleaved to carboxylic acids or esters under mild conditions. The chiral 1 (S)-camphor-2-cis-methylidene-isocyanide (5) can be prepared in two steps from camphor and methylisocyanide. Its application in the Passerini reaction generates alpha-acyloxyamides (6, 7, 8, 9) with a diastereomeric excess of > 92%, in the Ugi reaction alpha-acylaminoamides with a diastereomeric excess of 0% are formed.