3-(3, 5-Dimethylbenzyl) uracil (3) was treated with alkyl halides in the presence of alkali to give 1-substituted congeners. Condensation of 3 with alcohols using the Mitsunobu reaction was also employed as an alternative method. The anti-HIV-1 activity of 1-substituted analogues of 3-(3, 5-dimethylbenzyl) uracil was evaluated according to previously established procedures. It appeared that the nitrogen of the 1-cyanomethyl group is ...