title: Exomethylene pyranonucleosides: efficient synthesis and biological evaluation of 1-(2,3,4-trideoxy-2-methylene-beta-d-glycero-hex-3-enopyranosyl)thymine.
abstract: A new series of unsaturated pyranonucleosides with an exocyclic methylene group and thymine as heterocyclic base have been designed and synthesized. d-Galactose (1) was readily transformed in three steps into the corresponding 1-(beta-d-galactopyranosyl)thymine (2). Selective protection of the primary hydroxyl group of 2 with a t-butyldimethylsilyl (TBDMS) group, followed by specific acetalation, and oxidation gave 1-(6-O-t-butyldimethylsilyl-3,4-O-isopropylidene-beta-d-lyxo-hexopyranosyl-2-ulose)thymine (5). Wittig reaction of the ketonucleoside 5, deprotection and tritylation of the 6'-hydroxyl group gave 1-(2-deoxy-2-methylene-6-O-trityl-beta-d-lyxo-hexopyranosyl)thymine (9). Exomethylene pyranonucleoside 9 was converted to the olefinic derivative 10, which after detritylation afforded the title compound 1-(2,3,4-trideoxy-2-methylene-beta-d-glycero-hex-3-enopyranosyl)thymine (11). These novel synthesized compounds were evaluated for antiviral activity against rotaviral infection and cytotoxicity in colon cancer. As compared to AZT, compounds 1-(2-deoxy-2-methylene-beta-d-lyxo-hexopyranosyl)thymine (7) and 1-(beta-d-lyxo-hexopyranosyl-2-ulose)thymine (8) showed to be more efficient, in rotavirus infections and in treatment of colon cancer.
authors.affiliation: Department of Biochemistry and Biotechnology, Laboratory of Organic Chemistry, University of Thessaly, 26 Ploutonos Street, 41221 Larissa, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Agelis
authors.forename: Niki
authors.initials: N
authors.lastname: Tzioumaki
authors.forename: Tanja
authors.initials: T
authors.lastname: Botić
authors.forename: Avrelija
authors.initials: A
authors.lastname: Cencic
authors.forename: Dimitri
authors.initials: D
authors.lastname: Komiotis
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000633:toxicity; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D020128:Inhibitory Concentration 50; D008745:Methylation; D015394:Molecular Structure; D009705:Nucleosides / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity*; D013329:Structure-Activity Relationship; D013941:Thymine / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000633:toxicity*
chemical_list: C522701:1-(2,3,4-trideoxy-2-methylene-beta-d-glycero-hex-3-enopyranosyl)thymine; D000998:Antiviral Agents; D009705:Nucleosides; D013941:Thymine