4-Amino-1-(2, 3-dideoxy-β-D-glycero-pentofuranosyl)-1H-pyrazolo [3, 4-d] pyrimidine (5) was synthesized from 8-aza-7-deaza-2'-deoxyadenosine (1). Benzoylation of the 4-amino group of 1 followed by 4, 4'-dimethoxytritylation of the 5'-hydroxyl function gave 2b. Barton
![4-amino-1-(2,3-dideoxy-β-D-glycero-pentofuranosyl)-5'-O-(4,4'-dimethoxytriphenylmethyl)-1H-pyrazolo[3,4-d]pyrimidine结构式](https://image.chemsrc.com/caspic/306/119898-94-1.png)
![[(2S,5R)-5-(4-aminopyrazolo[3,4-d]pyrimidin-1-yl)oxolan-2-yl]methanol结构式](https://image.chemsrc.com/caspic/268/119898-95-2.png)
![4-benzoylamino-1-(2,3-dideoxy-β-D-glycero-pentofuranosyl)-5'-O-(4,4'-dimethoxytriphenylmethyl)-1H-pyrazolo[3,4-d]pyrimidine结构式](https://image.chemsrc.com/caspic/344/119898-93-0.png)