TOTAL SYNTHESES OF N-BOC-PROTECTED 3'-DEOXY-4'-AZATHYMIDINE AND 4'-AZAURIDINE

Novel modified nucleosides 4, 11, ent-11, and 17, wherein the furanose ring oxygen is replaced by nitrogen, have been synthesized by reacting azasugars 3, 10, ent-10, and 15 with silylated uracil or thymine bases.