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Few examples of new heterocyclic 1-deazapyrimido[1,2,3- cd ]purine derivatives were synthesized by intramolecular cyclization of methyl 7-(oxiran-2-ylmethyl)-7 H -pyrrolo[2,3- d ]pyrimidine-6-carboxylates. The latter were obtained by iodolactonization of 7-allylpyrrolo[2,3- d ]pyrimidine-6-carboxylic acids.

7-Substituted pyrrolo[2,3-d]pyrimidines for the synthesis of new 1-deazapyrimido[1,2,3-cd]purines