3'-C-methyl-2'-deoxy-a-~-threo-pentofuranosyl) thymine was converted to a mixture of 3'4 '- methylidene-2 ', 3 '-dideoxy-5-methyluridine and 3 '-C-methyl-2 ', 3 '-dideoxy-2 ', 3'-didehydro- 5-methyluridine, which were separated. The stereoselectivity of the Grignard reagent's attachment to 2-deoxyfuranose 3-ulosides has been ruled by the substitute configuration at C1. Also, the effect of the hydroxyl or OBz group configuration at C3 on the condensation ...
