Reactions of Methyl Acetylenecarboxylate with Heterocyclic Enamines: [2+2] Cycloadditions in Polar and Non-Polar Solvents
Özet
In this study, enamines of cyclic ketones reacting with methyl acetylenecarboxylate to produce intermadiate cyclobutene adducts have been isolated. Reactions of methyl acetylenecarboxylate with enamines derived from cyclobutene adducts and ring expansion products were described.