photochemical reaction of 4-thioxoazetidine-2-one with alkenes gave [2+2] adducts (thietane-fused b-lactams which were converted to 4-spirocyclopropyl b-lactams on desulfurization with Raney nickel.
photochemical reaction of 4-thioxoazetidine-2-one with alkenes gave [2+2] adducts (thietane-fused b-lactams which were converted to 4-spirocyclopropyl b-lactams on desulfurization with Raney nickel.