Benzotriazol-1-yl-acetone as a building block in heterocyclic chemistry: Aroute to benzotriazolylpyridazines, benzotriazolylphthalazines and benzotriazolylpyrazolo[5,1-c]-1,2,4-triazines

Benzotriazolylacetone is coupled with aromatic diazonium salts to yield ary lhydrazones, which can be condensed with ethyl cyanoacetate yielding pyrida zinones whose reactivity towards activated double bond systems is investiga ted.