Studies on Diazepines. XI. Oxidation of 1H-1, 2-Benzodiazepines with Lead Tetraacetate : Formation and Some Reactions of Novel 5H-1, 2-Benzodiazepines

抄録

Treatment of 1H-1, 2-benzodiazepines having an electron-withdrawing group such as methoxycarbonyl or cyano in the 3-position with lead tetraacetate resulted in the formation of the corresponding 5-acetoxy-5H-1, 2-benzodiazepines, which are the first reported examples of 5H-1, 2-benzodiazepines. The 5H-diazepines, on treatment with base, underwent tautomerization to the 1H-isomers, and on photolysis gave 3-acetoxyindole via the tricyclic valence isomers. Furthermore, treatment of a 5H-diazepine with methanol or acetic acid gave the corresponding 4-methoxy- or 4-acetoxy-4, 5-dihydro-1H-1, 2-benzodiazepine, respectively, by 1, 4-addition of the reagent.