Synthesis and hydrolytic stability of 4-substituted pyrazolo[3,4-d]pyrimidine 2′-deoxyribofuranosides
作者:Frank Seela、Herbert Steker
DOI:10.1039/p19850002573
日期:——
4-chloro-1H-pyrazolo[3,4-d]pyrimidine (1) with 2-deoxy-3,5-di-O-(p-toluoyl)-α-D-erythro-pentofuranosyl chloride (2) yielded the N-1 glycosylation product (3) in 42%. The protected intermediate (3) was converted into pyrazolo[3,4-d]pyrimidine 2′-deoxyribofuranosides with amino, oxo, and thioxo substituents at C-4. Kinetic data of proton-catalysed hydrolysis showed that pyrazolo[3,4-d]pyrimidine 2′-deoxyribofuranosides
的4-氯-1-相转移糖基化ħ -吡唑并[3,4- d ]嘧啶(1)与2-脱氧-3,5-二- Ö - (p甲苯甲酰)-α- d -赤-pentofuranosyl氯化物(2)产生42%的N-1糖基化产物(3)。将被保护的中间体(3)转化为在C-4具有氨基,氧代和硫代氧取代基的吡唑并[3,4- d ]嘧啶2'-脱氧核糖呋喃糖苷。质子催化水解的动力学数据表明,吡唑并[3,4- d ]嘧啶2'-脱氧核糖呋喃糖苷在N处更稳定。-糖基键比母体嘌呤核苷高。