Heterocyclization of iminium salts from some β-amino-β-lactams and their gem-difunctional derivatives

Article abstract of DOI:10.1016/S0040-4020(01)88204-1

β-Amino-β-lactams and their gem-difunctional derivatives of two series (1-benzoazepine and linear analog) lead stereospecifically to two types of heterocycles in strong acidic medium. Iminium ions and benzylic carbocations are proposed as reactive intermediates.