Regio-selective diazepine formation from 3-azidopyridines: The first examples of monocyclic 2H-1,4-diazepines.

Abstract
Photolysis of the 2-substituted 3-azidopyridines (5) having no substituent in the 4-position in the presence of sodium methoxide gave the novel 2H-1, 4-diazepines (8), whereas 2-unsubstituted (1) and 2, 4-disubstituted 3-azidopyridines (10), upon irradiation under similar conditions, afforded the 5H-1, 3-diazepines.

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