8 rn-ClPBA= m-chloroperbenzoic acid oxide derivative 3 gave a mixture of two products, compounds 4 and 5, both of which, while containing the anticipated new ring formed between the 1 and 2 positions of the benzodiazepine ring, were further modified as indicated by the structures shown. Treatment of the 3-acetoxy benzodiazepine 6 under the same conditions also gave a mixture of two products, compounds 5 and 7.
