title: Synthesis of triazole nucleoside derivatives.
abstract: 5'-O-Mesyl-2',3'-O-isopropylidene ribonucleosides (4 and 12) were converted to their 5'-substituted nucleosides in good yields by reacted with NaN3 or KI. 2',3'-O-Isopropylidene ribonucleosides (3 and 11) were prepared in good yields from ribonucleosides 1 and 2 with a reaction mixture of acetone and triethyl orthoformate instead of using acetone diethyl acetal. Compound 1 or 2 was treated with 2-acetoxyisobutyryl halide (Cl or Br) to give 1-[2-O-acetyl-3-halo-3-deoxy-5-O-(2,5,5-trimethyl-1,3-dioxolan-4-on-2-yl)-beta-D-xylofuranosyl]-1,2,4-triazole-3-carboxamide (19, 22, and 23) in high yields. Instead of using 2-acetoxyisobutyryl bromide, the mixture of 2-acetoxyisobutyryl chloride and NaBr was employed in the synthesis of 22 and 23. Treatment of 19 with an activated Zn/Cu couple and deprotection gave 2',3'-anhydro nucleoside (21), and treatment of 22 and 23 with an activated Zn/Cu couple and a little of HOAc and deprotection gave corresponding 2',3'-unsaturated triazole nucleosides (24 and 25), respectively. The biological activity of the compounds (7-10, 15-18, and 24) was examined in human liver cancer cells (A-549), lung cancer cells (BEL-7402), and Flu-A cells.
authors.affiliation: Faculty of Chemistry, Sichuan University, Chengdu Sichuan, PR China.
authors.forename: Zicheng
authors.initials: Z
authors.lastname: Li
authors.forename: Shuhua
authors.initials: S
authors.lastname: Chen
authors.forename: Ning
authors.initials: N
authors.lastname: Jiang
authors.forename: Gang
authors.initials: G
authors.lastname: Cui
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D006801:Humans; D009705:Nucleosides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D014230:Triazoles / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D000998:Antiviral Agents; D009705:Nucleosides; D014230:Triazoles