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 deoxygenation of the phenoxythiocarbonyl compound 3 afforded 4a and yielded 5 after removal of the protecting groups. The N-glycosylic bond stability of 5 to acid was higher than that of 2', 3'-dideoxyadenosine (ddA). Compound 5 showed no appreciable activity against human immunodeficiency virus. It was converted into allopurinol 2', 3'-dideoxyribofuranoside (6) by adenosine deaminase but at a lower rate than the conversion of ddA into ddl.
4-Amino-1-(2, 3-dideoxy-β-D-glycero-pentofuranosyl)-1H-pyrazolo [3, 4-d] pyrimidine (5) 由 8-aza-7-deaza-2'-deoxyadenosine (1) 合成。对 1 的 4-
氨基进行苯甲酰基化,然后对 5'-羟基进行 4,4'-二甲氧基三苯甲基化,得到 2b。苯氧基
硫代羰基化合物 3 的巴顿脱氧反应得到 4a,去除保护基团后得到 5。5 的 N-糖苷键对酸的稳定性高于 2',3'-二脱氧
腺苷(ddA)。化合物 5 对人类免疫缺陷病毒没有明显的活性。它能被
腺苷脱氨酶转化为异
嘌呤醇 2',3'-双脱氧核苷(6),但转化率低于 ddA 转化为 ddl 的转化率。