4‐Methylene‐1‐cyclopentenes from Methylenecyclopropanes and Alkynyltrimethylsilanes

Abstract

[3 + 2]Cycloadditions between methylenecyclopropanes 1 and substituted alkynes 2 are achieved on a triarylphosphite(“TOPP”)-containing nickel(0) catalyst. The three 4-methylene-1-cyclopentenes 3—5, R and/or R′ ≠ H, are formed in the reaction with 1.