139888-11-2Relevant articles and documents
Nucleophilic substitution approach to 4′-substituted thymidines by employing 4′-benzenesulfonyl leaving group
Shimada, Hisashi,Kikuchi, Satoshi,Okuda, Saori,Haraguchi, Kazuhiro,Tanaka, Hiromichi
experimental part, p. 6008 - 6016 (2011/03/18)
Synthesis of 4′-substituted thymidines was investigated based on nucleophilic substitution using organosilicon and organoaluminum reagents. Two substrates having a benzenesulfonyl leaving group at the 4′-position were prepared for this purpose: 1-[4-benzenesulfonyl-3,5-bis-O-(tert-butyldimethylsilyl)-2-deoxy-α-l-threo-pentofuranosyl]thymine (8α) and the 4′-(benzenesulfonyl)thymidine derivative (8β). The reaction of 8α with organosilicon reagents (Me3SiCH2CH{double bond, long}CH2 and Me3SiN3) in combination with SnCl4 gave preferentially the 4′-substituted β-d-isomer: the 4′-allyl (12β) and 4′-azido (15β) derivatives, respectively. The reaction of 8α with AlMe3, however, gave the 4′-methyl-α-l-isomer (16α) as the major product, presumably through an ion pair mechanism. By employing the substrate 8β in this reaction, the 4′-methylthymidine derivative (16β) was obtained exclusively in high yield. The 4′-ethyl (20β) and 4′-cyano (24β) derivatives were also synthesized by reacting 8β with the respective organoaluminum reagent.
Synthesis of 4'-cyanothymidine and analogs as potent inhibitors of HIV
O-Yang,Wu,Fraser-Smith,Walker
, p. 37 - 40 (2007/10/02)
4'-Cyanothymidine inhibits HIV in A301 (Alex) cells with an IC50 of 0.002 μM. The uridine and cytidine analogs show similar potencies.