The polycyclic cyclopropanation reaction of several alkene-containing Fischer carbene complexes with various alkyne partners to provide bicyclo [4.1. 01 enol ethers and ketones was examined. A number of features were probed, including the role of carbene donor substituent (amino vs alkoxy), the presence of one vs two pendant alkenes in the carbene complex, the level and sense of diastereoselectivity, and the impact of the substituents ...
