title: Synthesis and anti-HIV activity of 4'-substituted 4'-thiothymidines: a new entry based on nucleophilic substitution of the 4'-acetoxy group.
abstract: Diacetoxylation of 1-(2,5-dideoxy-beta-L-glycero-pent-4-eno-4-thiofuranosyl)thymine (13) with Pb(OAc) 4 allowed introduction of an acetoxy leaving group to the 4'-position. Nucleophilic substitution of the resulting 4'-acetoxy derivative (14) with silicon reagents enabled us to prepare the 4'-phenylthio (17a), 4'-azido (18a), 4'-methoxy (20a), and 4'-allyl (21a) analogues of 4'-thiothymidine. 4'-Cyano ( 25a) and 4'-ethynyl (31) nucleosides were also synthesized from 3',5'-bis-O-TBDMS derivative (24). Among novel 4'-substituted 4'-thiothymidines, the 4'-azido (33), 4'-cyano (36), and 4'-ethynyl (37) derivatives were found to show potent inhibitory activity against HIV-1 and HIV-2. It is noteworthy that 36 and 37 were also inhibitory against replication of HIV variant resistant to 3TC (HIV-1 M184V), being as potent as against HIV-1 IIIB.
authors.affiliation: School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan. harakazu@pharm.showa-u.ac.jp
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Haraguchi
authors.forename: Hisashi
authors.initials: H
authors.lastname: Shimada
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Takayuki
authors.initials: T
authors.lastname: Hamasaki
authors.forename: Masanori
authors.initials: M
authors.lastname: Baba
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Gullen
authors.forename: Ginger E
authors.initials: GE
authors.lastname: Dutschman
authors.forename: Yung-Chi
authors.initials: YC
authors.lastname: Cheng
mesh_terms: D019380:Anti-HIV Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002460:Cell Line; D015497:HIV-1 / Q000187:drug effects*; D015498:HIV-2 / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D008968:Molecular Conformation; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013936:Thymidine / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000494:pharmacology; D014779:Virus Replication / Q000187:drug effects
chemical_list: D019380:Anti-HIV Agents; D013936:Thymidine