Stereoselective Synthesis of 3'-Fluoro-and 3'-Azido-4'-methyl-2',3'-D-glycero-pentofuranoside-5-fluorouracils. -The synthesis of the title compounds is achieved via stereoselective formation of the epoxide (III) and its regioselective nucleophilic cleavage. -(RIEHOKAINEN, E.; MIKERIN, I. E.; SLOBODYAN, N. N.; SEVERIN, S.