Stable 1H-1,3-diazepines 7–9,10,13,14,17 and 19 are obtained, often in high yields, by photolysis of triflouoromethyl-substituted azido- or tetrazolo-pyridines in the presence of alcohols or amines; in some cases 5H-1,3-diazepines are also formed(11,21 and 23).
A. Reisinger and C. Wentrup, Chem. Commun., 1996, 813 DOI: 10.1039/CC9960000813
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