Synthesis and biological evaluation of certain C-4 substituted pyrazolo[3,4-b]pyridine nucleosides
作者:Yogesh S. Sanghvi、Steven B. Larson、Randall C. Willis、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1021/jm00125a004
日期:1989.5
C-4 substituted pyrazolo[3,4-b]pyridine nucleosides have been synthesized and evaluated for their biological activity. Successful synthesis of various C-4 substituted pyrazolo[3,4-b]pyridine nucleosides involves nucleophilic displacement by a suitable nucleophile at the C-4 position of 4-chloro-1H-pyrazolo[3,4-b]pyridine (5), followed by glycosylation of the sodium salt of the C-4 substituted pyrazolo[3
已合成了一系列C-4取代的吡唑并[3,4-b]吡啶核苷,并对其生物学活性进行了评估。成功合成各种C-4取代的吡唑并[3,4-b]吡啶核苷涉及在4-氯-1H-吡唑并[3,4-b]吡啶的C-4位置通过合适的亲核试剂进行亲核置换(5) ,然后将C-4取代的吡唑并[3,4-b]吡啶的钠盐与受保护的α-卤代呋喃呋喃糖进行糖基化。这种方法的使用为C-4取代的吡唑并[3,4-b]的β-D-呋喃核糖基,β-D-阿拉伯呋喃糖基和2-脱氧-β-D-戊戊呋喃糖基核苷提供了简单直接的途径。吡啶,其中C-4取代基是叠氮基,氨基,甲氧基,氯或氧代。根据UV数据确定这些糖基化的区域特异性,并通过1 H NMR分析确定端基构型。通过对三种化合物15、31和42的单晶X射线衍射研究确定了结构分配,分别代表了核糖2'-脱氧核糖核苷和核糖核苷。所有三个α-卤代糖的立体定向连接似乎是通过吡唑并[3,4-b]吡啶的阴离子N-1在卤