Abstract
Abstract As part of a synthetic program on cyclic oligomers of DNA, the cyclic dimer of 5-fluoro-2′-deoxyuridylic acid (FdUMP) was synthesized. The fully protected dimer 5 was obtained following Catlin and Cramer′s phosphotri-ester strategy. Autocondensation and deprotection then afforded the title compound 9 [cyclo(5FdUp5FdUp)] in excellent yield. In vitro, 9 proved slightly less active than FdUrd in inhibiting the proliferation of various murine and human tumor cells, but, in vivo, 9 was equally effective, and less toxic than 5-FdUrd in inhibiting adenocarcinoma tumor growth in mice.
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