Synthesis of novel benzo[<i>h</i>] [1,6]naphthyridines <i>via</i> a rearrangement of hexahydro‐5<i>H</i>‐pyrrolo [2,1 ‐<i>c</i>] [1,4]benzodiazepines

Abstract

Abstract Heating of hexahydro‐5 H ‐pyrrolo[2,1‐ c ][1,4]benzodiazepine‐2,5,11‐trione in boiling phosphoryl chloride led to a rearranged product like 3,5‐dichlorobenzo[ h ][1,6]naphthyridine. This structure was established from X‐ray diffraction analysis.