Substrate scope of methylenecyclopropanes^a.

^aReaction conditions: phenyl hydrazone 2a (0.2 mmol, 1.0 M generated in situ from benzaldehyde and hydrazine), 1 (0.1 mmol), [Pd(allyl)Cl]₂ (5 mol%), IPr·HCl (20 mol%), and KOH (1.2 equiv.) in THF (0.2 M) were stirred under N₂ at 50 °C for 16 h; isolated yields were given.

^bThe ratio of 3na and 3na′ was determined by ¹H NMR analysis of the crude mixture.