title: Pyrazolo[4,3-d]pyrimidine nucleosides. Synthesis and antiviral activity of 1-beta-D-ribofuranosyl-3-methyl-6-substituted-7H-pyrazolo[4,3-d]pyr imi din-7-ones.
abstract: N1 analogues of formycin B, with substituents at the 3 and 6 positions of the pyrazolo[4,3-d]pyrimidine moiety were synthesized by the direct SnCl4-catalyzed ribosylation method. The site of the glycosidic linkage and the anomeric configurations were established on the basis of X-ray crystallography, as well as 1H and 13C nuclear magnetic resonance spectroscopy. Preliminary results of the antiviral testing of these derivatives in vitro are described.
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000138:chemical synthesis*; D000998:Antiviral Agents / Q000138:chemical synthesis*; D002460:Cell Line; D002522:Chlorocebus aethiops; D005573:Formycins / Q000138:chemical synthesis* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D018139:Simplexvirus; D010948:Viral Plaque Assay
chemical_list: D000903:Antibiotics, Antineoplastic; D000998:Antiviral Agents; D005573:Formycins