DIENE-TRANSMISSIVE HETERO-DIELS-ALDER REACTION OF CROSS-CONJUGATED AZATRIENES - A NOVEL AND EFFICIENT METHOD FOR THE SYNTHESIS OF RING-FUSED NITROGEN-HETEROCYCLES

A diene-transmissive hetero-Diels-Alder reaction of cross-conjugated a zatrienes, which provides a novel and efficient synthetic method for r ing-fused, nitrogen-heterocyclic frameworks such as quinazolin-2-ones and pyrimido[5,4-c]-pyridazin-6-ones, is described for the first time.