Heterocyclic Compounds
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ChemInform Abstract: 1,6-Diazaphenanthrenes from 1,2-Dihydro-4,6-dimethyl-2-(2-nitrophenyl)pyridine-3,5-dicarboxylic Acid Esters.
First published: January 10, 1989
Abstract
The nitrophenyldihydropyridines (IV) are irradiated, forming the nitrosophenylpyridines (V) which are transformed into the dimers (VI) in the solid state.
ChemInform Abstract
The nitrophenyldihydropyridines (IV) are irradiated, forming the nitrosophenylpyridines (V) which are transformed into the dimers (VI) in the solid state. These are cyclized, yielding the chloro-6-hydroxybenzonaphthyridines (VII) which are also obtained directly from (IV). Oxidation of the dihydropyridines (IV) gives the pyridines (VIII) which undergo reductive cyclization, yielding the 6-hydroxybenzonaphthyridines (IX). The 6-hydroxybenzonaphthyridines (VII) and (IX) are deoxygenated, forming the benzonaphthyridines (X) and (XI).
