Exploiting novel 2-(tert-butyldimethylsiloxy)thiophene (1, TBSOT) as versatile carbon nucleophile and bothenantiomers of glyceraldehyde acetonide as chiral sources, an entry to bothenantiomers of anti HIV-active 2′,3′-dideoxy-4′-thiocytidine 10 and ent-10 was devised and executed.