Synthesis of [3.3.3]propellanes by ‘exocyclic’ transannular cycloaddition of olefinic methylenecyclopropanes
Abstract
Olefinic methylenecyclopropanes undergo quantitative transannular ring closure under catalysis by Group 10 metals to give [3.3.3]propellanes, through cycloaddition of a trimethylenemethane-like intermediate.