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Synthesis of 1,2,4-triazoles

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[1,2,4]Triazolo[1,5-a]pyridines have been prepared in good yields from 2-aminopyridines by cyclization of N-(pyrid-2-yl)formamidoximes under mild reaction conditions with trifluoroacetic anhydride.
E. Huntsman, J. Balsells, Eur. J. Org. Chem., 2005, 3761-3765.