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Various new 5-substituted 3'-azido- and 3'-amino derivatives of 2'-deoxyuridine and 2'-deoxycytidine have been synthesized and biologically evaluated. Among these compounds, 3'-amino-2',3'-dideoxy-5-fluorouridine (3), 3'-amino-2',3'-dideoxycytidine (7a), and 3'-amino-2',3'-dideoxy-5-fluorocytidine (7c) were found to be the most active against murine L1210 and sarcoma 180 neoplastic cells in vitro, with an ED50 of 15 and 1 microM, 0.7 and 4 microM, and 10 and 1 microM, respectively. The 3'-azido derivatives, 2 and 6c, were less active in comparison with their 3'-amino counterparts. In addition, the 5-fluoro-3'-amino nucleosides, 3 and 7c, were tested against L1210 leukemia bearing CDF1 mice. Our preliminary findings indicate that compound 7c (6 X 200 mg/kg) was as active as the positive control, 5-fluorouracil (6 X 20 mg/kg), yielding a T/C X 100 of 146 and 129, respectively. However, 3 was found to be inactive in this experiment.
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