N-Functionalized 1-Alkynylamides: New Building Blocks for Transition Metal Mediated Inter- and Intramolecular [2+2+1] Cycloadditions.

A conceptually new, stereoselective approach to compounds such as 1 and 2 is expected from the so far unknown class of N-functionalized 1-alkynylamides. Building blocks of the type I and II can be applied to inter- and intramolecular, regio- and stereoselective [Co2 (CO)8 ]-mediated [2+2+1] cycloadditions. © 1998 WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany.