title: Asymmetric synthesis and antiviral activities of L-carbocyclic 2', 3'-didehydro-2',3'-dideoxy and 2',3'-dideoxy nucleosides.
abstract: Asymmetric syntheses of L-carbocyclic 2',3'-didehydro-2',3'-dideoxy- and 2',3'-dideoxypyrimidine and purine nucleoside analogues were accomplished, and their anti-HIV and anti-HBV activities were evaluated. The key intermediate, (1S, 4R)-1-benzoyloxy-4-(tert-butoxymethyl)cyclopent-2-ene (7), was prepared by benzoylation of the alcohol 2, selective deprotection of the isopropylidene group of 3, followed by thermal elimination via cyclic ortho ester or deoxygenation via cyclic thionocarbonate. The target compounds were also synthesized by thermal elimination via cyclic ortho esters from protected nucleosides. It was found that L-carbocyclic 2',3'-didehydro-2',3'-dideoxyadenosine (34) exhibited potent anti-HBV activity (EC(50) = 0.9 microM) and moderate anti-HIV activity (EC(50) = 2.4 microM) in vitro without cytotoxicity up to 100 microM.
authors.affiliation: Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, The University of Georgia, Athens, Georgia 30602, USA.
authors.forename: P
authors.initials: P
authors.lastname: Wang
authors.forename: B
authors.initials: B
authors.lastname: Gullen
authors.forename: M G
authors.initials: MG
authors.lastname: Newton
authors.forename: Y C
authors.initials: YC
authors.lastname: Cheng
authors.forename: R F
authors.initials: RF
authors.lastname: Schinazi
authors.forename: C K
authors.initials: CK
authors.lastname: Chu
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology / Q000633:toxicity; D000818:Animals; D019380:Anti-HIV Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology / Q000633:toxicity; D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology / Q000633:toxicity; D002460:Cell Line; D018360:Crystallography, X-Ray; D015497:HIV-1 / Q000187:drug effects; D006515:Hepatitis B virus / Q000187:drug effects; D066298:In Vitro Techniques; D020128:Inhibitory Concentration 50; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000821:virology; D008968:Molecular Conformation; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D019380:Anti-HIV Agents; D000998:Antiviral Agents; C116654:carbocyclic 2',3'-didehydro-2',3'-dideoxyadenosine; D000241:Adenosine