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Paper | Regular issue | Vol 53, No. 7, 2000, pp.1515-1522
Published online, 1st January, 1970
DOI: 10.3987/COM-00-8911
Chemistry of Indoles Carrying a Basic Function. Part VI. Synthesis of a New Ring System with Indole Nucleus

István Moldvai, Mihály Balázs, Eszter Gács-Baitz, Tünde Platthy, Eszter Temesvári-Major, and Csaba Szántay*

*Institute of Chemistry, Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budpest II, Pusztaszeri ut 59-67, P.O. Box 17, Hungary

Abstract

Stobbe condensed product half ester (2E;E-1,3,4,5-tetrahydrobenz[c,d]indole-5-ylidene-3’-ethoxycarbonylpropionic acid) afforded a monomer tetracyclic indole derivative (4; 5-ethoxycarbonyl-7-acetoxy-1H,9cH-3,4-dihydronaphto[c,d,e]indole) and a dimer (5; 5-ethoxycarbonyl-1H,9cH-3,4-dihydronaphto[c,d,e]indole-7-(O-E-1,3,4,5-tetrahydrobenz[c,d]indole-5-ylidene-3’-ethoxycarbonylethylpropionate) in an unexpected cyclisation.