title: Pyrazolopyrimidine nucleosides. 3. Synthesis of 1- and 2-( -D-ribofuranosyl)pyrazolo(3,4-d)pyrimidines from pyrazole nucleoside derivatives.
mesh_terms: D003500:Cyclization; D007536:Isomerism; D008722:Methods; D011720:Pyrazoles / Q000138:chemical synthesis*; D011743:Pyrimidines / Q000138:chemical synthesis*; D012263:Ribonucleosides / Q000138:chemical synthesis*
chemical_list: D011720:Pyrazoles; D011743:Pyrimidines; D012263:Ribonucleosides