Polycyclic N-Hetero Compounds. XIII. Reactions of Pyridine N-Oxides with Formamide

Reactions of pyridine (I, IV, X, XIII) or condensed pyridine (VII, XVI, XVIII) N-oxides with formamide were described. Although pyrimidinyl cyclization of active methyl group was unsuccessful, introduction of carbamoyl group at pyridine ring carbon adjacent to nitrogen atom was successful, i. e., 6-methylpyridine-2-(II), 4-methylpyridine-2-(V), 4-methylquinoline-2-(VIII), 5-methylpyridine-2-(XI), pyridine-2-(XIV), quinoline-2-(XVII), and isoquinoline-1-(XIX) carboxyamides were obtained.