Photochemistry of Conjugated Nitrogen-Carbonyl Systems. III. Photosensitized Oxygenation of 3-and 6-Substituted 2-Pyridones

抄録

Irradiation of solutions of 3-and 6-substituted 2-pyridones (1) in the presence of methylene blue as a sensitizer under an oxygen atmosphere gave 3-substituted pyridine-2, 6- (1H, 3H) -diones (2) and 6-substituted pyridine-2, 3- (1H, 6H) -diones (3), respectively, which are probably derived from the intermediate endoperoxides (6).