title: Design, synthesis, and antiviral evaluation of some polyhalogenated indole C-nucleosides.
abstract: 2,5, 6-Trichloro-1-(beta-D-ribofuranosyl)benzimidazole (TCRB), 2-bromo-5, 6-dichloro-1-(beta-D-ribofuranosyl)benzimidazole (BDCRB) and 2-benzylthio-5,6-dichloro-1-(beta-D-ribofuranosyl)benzimidazole (BTDCRB) are benzimidazole nucleosides that exhibit strong and selective anti-HCMV activity. Polyhalogenated indole C-nucleosides were prepared as 1-deaza analogs of the benzimidazole nucleosides TCRB and BDCRB. A mild Knoevenagel coupling reaction between an indol-2-thione and a ribofuranose derivative was developed for the synthesis of 2-benzylthio-5, 6-dichloro-3-(beta-D-ribofuranosyl)indole (12). 3-(beta-D-ribofuranosyl)-2,5,6-trichloroindole (16) was prepared from 12 in 4 steps. A Lewis acid-mediated glycosylation method was then developed to prepare the targeted 2-haloindole C-nucleoside 16 stereoselectively in four steps from the corresponding 2-haloindole aglycons. Only 12 was active against HCMV but it also was somewhat cytotoxic.
authors.affiliation: Department of Chemistry, College of Literature, Sciences and the Arts, University of Michigan, Ann Arbor, Michigan 48109-1065, USA.
authors.forename: Jiong J
authors.initials: JJ
authors.lastname: Chen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wei
authors.forename: John D
authors.initials: JD
authors.lastname: Williams
authors.forename: John C
authors.initials: JC
authors.lastname: Drach
authors.forename: Leroy B
authors.initials: LB
authors.lastname: Townsend
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002460:Cell Line; D003587:Cytomegalovirus / Q000254:growth & development*; D004353:Drug Evaluation, Preclinical; D006219:Halogens / Q000737:chemistry; D006801:Humans; D007211:Indoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D009705:Nucleosides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D014779:Virus Replication / Q000187:drug effects*
chemical_list: D000998:Antiviral Agents; D006219:Halogens; D007211:Indoles; D009705:Nucleosides