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Abstract
The synthesis of four 3,9-dideazapurines is described. In order to achieve the desired substitution pattern, a new approach to the pyrrolo[2, 3-c]pyridine ring system was devised utilizing the Gassman reaction as the key step for its construction. The four target heterocycles were all evaluated for their ability to inhibit human erythrocytic purine nucleoside phosphorylase.