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Racemic 4‐oxocyclopent‐2‐en‐1‐yl acetate was used in a short synthesis of nucleoside analogues with pyrimidine and purine heterobases. The protocol is based on a typical nucleophilic substitution process. Uracil, thymine, 6‐chloropurine, and some adenines gave the expected 4‐heterosubstituted products along with the isomeric 2‐heterosubstituted compounds as minor components. Samples of selected products...
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