title: Novel synthesis of seco type of acyclo C-nucleosides of 1,2,4-triazole and 1,2,4-triazol.
abstract: The seco C-nucleosides 3-(1,2,3,4,5-penta-O-acetyl-D-gluco- and D-galacto-pentitol-1-yl)-1H-1,2,4-triazoles (8 and 9) were obtained in a one pot by deamination and dethiolation of 4-amino-3-(D-gluco- and D-galacto-pentitol-1-yl)-5-mercapto-1,2,4-triazoles (1 and 2), respectively, using sodium nitrite in orthophosphoric acid and subsequent acetylation. Condensation of 1, 2, and 4-amino-3-(D-glycero-D-gulo-hexitol-1-yl)-5-mercapto-1,2,4-triazole (12) with phenacylbromide (11) afforded the corresponding 3-(D-gluco-, D-galactopentitol-1-yl) and 3-(D-glycero-D-gulo-hexitol-1-yl)-6-phenyl-7H-1,2,4-triazolo[3,4-b][1,3,4] thiadiazines (15, 16, and 17). Acetylation of 15-17 gave the penta- and hexa-O-acetyl derivatives 18-20, respectively. The structures were confirmed by using 1H, 13C, and 2D NMR spectra, DQFCOSY, HMQC, and HMBC experiments. The favored conformational structures were deduced from the vicinal coupling constants of the protons.
authors: Chemistry Department, Faculty of Science, Alexandria University, Egypt. elashry@internetalex.com
authors: E S
authors: ES
authors: El Ashry
authors: L F
authors: LF
authors: Awad
mesh_terms: D000107:Acetylation; D000212:Acyclovir / Q000737:chemistry; D000998:Antiviral Agents / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009705:Nucleosides / Q000138:chemical synthesis / Q000737:chemistry*; D013829:Thiadiazines / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*; D014498:Uracil / Q000031:analogs & derivatives / Q000737:chemistry
chemical_list: D000998:Antiviral Agents; D009705:Nucleosides; D013829:Thiadiazines; D014230:Triazoles; C045575:1,2,4-triazole; D014498:Uracil; C046151:N-(2-(hydroxyethoxy)methyl)-5-methyluracil; D000212:Acyclovir