1-(4-Chlorophenyl)-3a-methyl-5-phenyl-3a,4-dihydro-1,2,4-oxadiazolo[4,5-a][1,5]benzodiazepine

We report here the peri- and regioselectivity experienced in the 1,3-dipolar cycloaddition of 1,5-benzodiazepine to nitrile oxide. The crystal structure of the title cycloadduct, C₂₃H₁₈ClN₃O, shows that the condensation occurs at the N=C double bond at the 1 and 2 positions of the benzodiazepine.

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