Abstract
Pyrazoles, pyrazolo[3,4‐d]pyridazines, pyrrolo[3,4‐d]pyrazole‐4,6‐diones, and 2,3‐dihydro‐1,3,4‐thiadiazoles were synthesized via reactions of hydrazonoyl bromide with each of (2E)‐3‐(dimethylamino)prop‐2‐enoyl]benzo[f]2H‐chromen‐3‐one, N‐arylmaleimides, and alkyl carbodithioates.