Finally, we turned our attention to the evaluation of BCB scope. BCBs with aromatic, heteroaromatic and aliphatic substituents such as benzene (3ba-bb), 1,2-methylenedioxybenzene (3bc), furan (3bd), thiophene (3be), and butyl (3bf-bg) are well tolerated in current conditions. The ability to tolerate variations of both silyl enol ethers and BCBs indicated the potential of this method to generate a wide range of BCHs that are not easily accessible by current methods.