Synthesis of vinylogous carbamates by rhodium(II)-catalyzed olefination of tertiary formamides with a silylated diazoester

[GRAPHICS] Treatment of tertiary formamides with a silylated diazoester in the presence of a rhodium(11) catalyst leads to the formation of 3-amino-2-silyloxyacrylates in good yield. No olefination is observed if a nonsilylated diazo compound is employed.