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Paper | Regular issue | Vol 38, No. 6, 1994, pp.1299-1305
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6678
A Synthesis of Heterocyclic Ring Systems. Pyrido[3‘,2‘:4,5]thieno[2,3-b]pyrrolizine and Pyrido[6‘,5‘:4,5][3‘,2‘:4,5]dithieno[2,3-b‘:2,3-b]dipyrrolizine

Carlos Peinador, Ma. Carment Veiga, Juan Vilar, and José Ma. Quintela*

*Departamento de Química Fundamental Industrial, Facultad de Ciencias, Universidad de La Coruña, Campus de A Zapateria, s/n, E-15071, La Coruña, Spain

Abstract

A synthesis for two new polycyclic heterocyclic ring systems is reported. Cyclization of pyrrolidinocarboxamide derivatives of ethyl 3-(pyrrol-1-yl)thieno[2,3-b]pyridine-2-carboxylate (4) and ethyl 3,5-di(pyrrol-1-yl)dithieno[3‘,2‘-e:2,3-b]pyridine-2,6-dicarboxylate (11) afford iminium salts that were transformed into the new heterocyclic compounds (6) and (13), respectively.