5-{Amino-[2-((3aR,4R,6R,6aR)-6-hydroxymethyl-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-2H-pyrazol-3-ylamino]-methylene}-2,2-dimethyl-[1,3]dioxane-4,6-dione 以
二苯醚 为溶剂,
以71%的产率得到6-amino-1-(2,3-O-isopropylidene-β-D-ribofuranosyl)-1,7-dihydropyrazolo<3,4-b>pyridin-4-one