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Abstract
As part of our program on the synthesis of new heterocyclic compounds, we report here a one-step synthesis of [1,2,4]triazolo[4,3-d][1,4]benzodiazepine 3 and [1,2,4]oxadiazolo[4,5-d][1,4]benzodiazepine 5 by 1,3-dipolar cycloaddition of nitrilimines and nitrile oxides with 1,4-benzodiazepines 1.