Chemistry Letters, Vol.29, No.9, 984-985, 2000
Reaction between conjugated azoalkenes and pyrazolinones: A precious entry to new conjugated azodiene and asymmetric 4,4'-bipyrazole derivatives
The first direct nucleophilic addition under mild reaction conditions of heterocyclic compounds to conjugated azoalkenes is reported. This reaction readily gives rise to new conjugated azodiene or asymmetric 4,4'-bipyrazole derivatives by means of two independent pathways.