Abstract
A variety of tri-, tetra- and penta–cyclic pyrido[2′,3′:4,5]thieno[2,3-d]pyrimidines have been synthesised from 5-amino-6-formyl-4-methyl-2-phenylthieno[2,3-d]pyrimidine by Friedländer condensation with aliphatic, alicyclic, and heterocyclic ketones and other active methylene compounds.
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