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Paper | Regular issue | Vol 38, No. 9, 1994, pp.2065-2072
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6797
A Ready Entry to Substituted Derivatives of Pyrido[3",2":4‘,5‘]thieno[2‘,3‘:5,6]pyrido[2,3-d]pyrimidines, a New Tetraheterocyclic Ring System

Carlos Peinador, Ma. Carmen Veiga, Vicente Ojea, 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


Several 4-substituted pyrido[3",2":4‘,5‘]thieno[2‘,3‘:5,6]pyrido]2,3-d]pyrimidines (4) and (5) were prepared by reaction of an appropriate substituted thieno[2,3-b:4,5-b‘]dipyridine (2) and (dichloromethylene)dimethylammonium chloride.