Terashima, Masanao published the artcilePhotoinduced reactions. XXVII. Photochemistry of the phthalimide system. XIV. Photochemical synthesis of a pyridopyrrolo[2,1-a]isoindole system by cyclization of N-methylpyridylphthalimides, HPLC of Formula: 18437-58-6, the publication is Chemical & Pharmaceutical Bulletin (1977), 25(7), 1591-5, database is CAplus.
Photochem. reactions of N-(3-methyl-2-pyridyl)-(I), N-(4-methyl-3-pyridyl)-(II), and N-(3-methyl-4-pyridyl)phthalimide (III) were investigated. Although irradiation of II in an acetone solution gave only the dihydro product, 3-hydroxy-2-(3-methyl-2-pyridyl)phthalimidine, III afforded the expected cyclized product, 10b,11-dihydro-10b-hydroxy-6H-pyrido[4′,3′:4,5]pyrrolo[2,1-a]isoindol-6-one (IV) and dihydro product, 3-hydroxy-2-(4-methyl-3-pyridyl)phthalimidine. Under similar conditions, the cyclized product, 10b,11-dihydro-10b-hydroxy-6H-pyrido[3′,4′:4,5]pyrrolo[2,1-a]isoindol-6-one was obtained from the photolysis of III and none of the reduced product was isolated.
Chemical & Pharmaceutical Bulletin published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C15H14O3, HPLC of Formula: 18437-58-6.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem