Allenylmethylsilane Derivative as a Synthetic Equivalent of 1,2,3-Butatriene: Synthesis and Reactions of Di-exo-methylenecyclobutanes and -cyclobutenes

Abstract

Abstract 2-Methoxyallenylmethylsilane reacts with alkenes and alkynes in a [2+2] cycloaddition mode to give cyclobutanes and cyclobutenes, respectively. Cycloadducts are converted to di-exo-methylene compounds through 1,2-elimination of the methoxy and silyl groups. These di-exo-methylenecyclobutanes and -cyclobutenes react with alkenes and 1,3-dienes to afford fused bi- and tricyclic compounds.