Synthesis of the first examples of 5H-1,2-benzodiazepines
Abstract
Treatment of the 1H-1,2-benzodiazepines (1) with lead tetra-acetate affords the previously unknown 5H-1,2-benzodiazepines (2), which, on treatment with base, undergo tautomerization to the 1H-isomers (5), and on photolysis give the indole (8).