Regioselective Ring Expansion of 3,3-Dimethylaziridin-2-carboxylate and a Photochemical Entry to the Penem Nucleus
摘要:
3,3-Dimethylaziridin-2-carboxylates undergo ring expansion with thiocyanates to give a 4,4-dimethylthiazolidin-5-carboxylate as the major product. Irradiation of a N-cysteinyl-3,3-dimethylaziridin-2-carboxylate was found to give a penem in low yield, presumably via a transient thioaldehyde which added across the aziridine N-C(3) bond.