Pyrido[2,3‐H]‐2,6‐naphthyridines. I. Synthesis and thermal reactions of the 2,2′bisacylazide of 3,3′ bipyridine

Abstract 2 The2′‐bisacylazide of 3,3′‐bipyridine (1) has been synthesized from the (4,7)‐phenantholine‐5,6‐dione (3) and the thermal decomposition of this new bisacylazide has been shown to give rise to the Curtius rearrangement and subsequent cyclization to the pyrido[2,3‐h]‐2,6‐naph‐thridinone ring system 8.