| Summary: | A novel approach to indolo[3,2-<i>c</i>]isoquinoline and dibenzo[<i>c</i>,<i>h</i>][1,6]naphthyridine tetracyclic systems was discovered based on switchable reduction of 2-methoxy-3-(2-nitrophenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid prepared via Castagnoli–Cushman reaction. Reduction with ammonium formate resulted in the expected selective transformation of the nitro group (thus providing access to substituted dibenzo[<i>c</i>,<i>h</i>][1,6]naphthyridine via cyclization and dehydrogenation). However, attempted reduction with sodium sulfide initiated a previously unknown reaction cascade including double reduction, cyclization, and decarboxylation, leading to formation of indolo[3,2-<i>c</i>]isoquinoline polyheterocycle in one synthetic step.
|
|---|
