Nucleosides. 146. 1-Methyl-5-(2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)uracil, the C-nucleoside isostere of the potent antiviral agent, 1-(2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)thymine (FMAU). Studies directed toward the synthesis of 2'-deoxy-2'-substituted arabino nucleosides. 6

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Abstract
The synthesis of 5-(2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)-1-methyluracil (1, C-FMAU), an isostere of the potent antiviral and antitumor nucleoside 1-(2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)thymine (2''-fluoro-5-methyl-ara-U or FMAU), was achieved. Pseudouridine (2) was converted into 4,5''-anhydro-3''-O-acetyl-2''-O-triflylpseudouridine (4), which was treated with tris(dimethylamino)sulfur(1+) difluorotrimethylsilicate (TASF)to give 4,5''-anhydro-5-(3-O-acetyl-2-deoxy-2-fluoro-.beta.-D-arabinofuranosyl)-1-methyluracil (5b) in 40% yield. Acid hydrolysis of the 4,5''-anhydro linkage of 5b with Dowex 50 (H+) afforded C-FMAU. The inhibitory activity of C-FMAU against HSV-1 and HSV-2 was about 10-fold less than that of FMAU in tissue culture. This compound, however, did not show significant activity in mice inoculated with HSV-1 or HSV-2.

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