[Synthesis of 1,4-benzodiazepine and 1,5-benzodiazocine through oxidative fission of the double bond of indole derivatives].

: A simplified new synthesis of some 5-phenyl-1,4-benzodiazepines and 6-phenyl-1,5-benzodiazocines, in satisfactory yields, by oxidation with sodium periodate of 1-alkylamino-2-methyl-3-phenylindoles, is described.