Synthesis and biological activity of certain 3,4-disubstituted pyrazolo[3,4-d]pyrimidine nucleosides
作者:Howard B. Cottam、Charles R. Petrie、Patricia A. McKernan、Richard J. Goebel、N. Kent Dalley、Richard B. Davidson、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1021/jm00375a006
日期:1984.9
A number of 3,4-disubstituted pyrazolo[3,4-d]pyrimidine ribonucleosides were synthesized and tested for their biological activity. Glycosylation of persilylated as well as nonsilylated 3-bromoallopurinol with 1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose (4) provided the key intermediate 3-bromo-1-(2,3,5-tri-O-benzoyl-beta-D-ribofuranosyl)-pyrazolo[3,4-d] pyrimidin-4(5H)-one (5a). Similar glycosylations
合成了许多3,4-二取代的吡唑并[3,4-d]嘧啶核糖核苷,并对其生物学活性进行了测试。使用1-O-乙酰基2,3,5-三-O-苯甲酰基-D-呋喃呋喃糖(4)对全硅烷基化的和未甲硅烷基化的3-溴代嘌呤醇进行糖基化,从而提供了关键的中间体3-溴代1-(2,3, 5-三-O-苯甲酰基-β-D-呋喃呋喃糖基)-吡唑并[3,4-d]嘧啶-4(5H)-一(5a)。3-氰基铝嘌呤醇和3-(甲硫基)铝嘌呤醇的类似糖基化提供了相应的受保护的N-1糖基衍生物(5b和5c)。这些核苷(5a-c)的脱苯甲酰化得到相应的3-溴-,3-氰基-和3-(甲硫基)alalpurinol核苷(6a-c)。根据光谱研究以及向别嘌呤醇核糖核苷的转化,确定了6a和6c的糖基化位点和异头构型,而6b的结构分配是通过单晶X射线分析得出的。5a和5b的常规官能团转化提供了许多新颖的3-取代的别嘌呤醇核苷,其中包括10a和18a-d。4-氨基-3-溴吡唑并[3