A one-pot–three-step method has been developed for the conversion of oxazolino-2 H- indazoles into triazolotriazepinoindazolones with three points of diversity. Step one of this process involves a propargyl bromide-initiated ring opening of the oxazolino-2 H-indazole (available by the Davis–Beirut reaction) to give an N 1-(propargyl)-N 2-(2-bromoethyl)- disubstituted indazolone, which then undergoes− CH2Br→− CH2N3 displacement (step ...