Pyrroloindoles. 12. Synthesis of 1H, 10H-benzo[e]pyrrolo[3,2-g]indole

Cyclization of ethyl pyruvate 2,3-naphthylenehydrazone in polyphosphate ester gives 2,9-diethoxycarbonyl-1H,10H-benzo[e]pyrrolo[3,2-g]indole, which on hydrolysis and decarboxylation of the resulting acid affords the unsubtituted 1H,10H-benzo[e] pyrrolo[3,2-g]indole.For communication 11, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1222–1224, September, 1985.