Two versatile syntheses of 1- and 1,2-disubstituted 2-benzazepinones are presented, using N-acyliminium ions as reactive intermediates. The methodology for 1-substitution is based on the synthesis of benzotriazole adducts, which are cyclized upon addition of AlCl3. The simultaneous introduction of 1- and 2-substitions is realized by an N-acylation of an imine.