Iminodithiocarbonates as Formaldehyde Imine Equivalents: Sequential Two Step Approach to 4-Unsubstituted .beta.-Lactams through Chromium(0) Carbene Photocycloaddition-Nickel Boride Desulfurization
Chromium-carbene-mediated synthesis of 4-oxo .beta.-lactams (malonimides) and malonic acid derivatives
摘要:
The photochemical reaction of chromium carbene (Fischer) complexes and readily available iminodithiocarbonates forms 4,4-bis(methylthio) beta-lactams in good to excellent yields, and upon N-bromosuccinimide oxidation, these afford 4-oxo beta-lactams (malonimides). Basic hydrolysis of the latter compounds yields malonic acid derivatives that are not otherwise easily accessible.