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.
enriched 2',3'-dideoxynucleosides 14a-c (alpha and beta anomers of L- and D-series), 2',3'-dideoxy-4'-thionucleosides 21a-c (alpha and beta anomers of L- and D-series), and 2',3'-dideoxy-4'-azanucleosides 28a-c (beta anomers of L- and D-series) were synthesized, with uniform chemistry and high stereochemical efficiency, exploiting a triad of versatile heterocyclic siloxy dienes, namely, 2-(tert-but