Notizen / Notes Polyazanaphthalenes, I The Reaction of Ethyl 6‐Amino‐5‐cyano‐4‐aryl‐2‐methyl‐4H‐pyran‐3‐carboxylate with Nucleophilic Reagents

Ethyl 6‐amino‐5‐cyano‐4‐aryl‐2‐methyl‐4 H ‐pyran‐3‐carboxylates 4 could be converted into 1,6‐diazanaphthalene, pyrano‐[2,3‐ c ]pyrazole, isoxazolo[3,4‐ b ]pyridine, pyrano[2,3‐ b ]pyridine, 1,8‐diazanaphthalene, and pyrano[2,3‐ d ]pyridine derivatives on treatment with malononitrile, hydrazine hydrate, hydroxylamine hydrochloride, (arylmethylene)malononitrile, cyanoacetamide, and acetic anhydride, respectively.