A convenient synthesis of 2′-deoxy-6-thioguanosine,<i>ara</i>-guanine,<i>ara</i>-6-thioguanine and certain related purine nucleosides by the stereospecific sodium salt glycosylation procedure
作者:Naeem B. Hanna、Kandasamy Ramasamy、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1002/jhet.5570250653
日期:1988.11
A simple and high-yield synthesis of biologically significant 2′-deoxy-6-thioguanosine (11), ara-6-thioguanine (16) and araG (17) has been accomplished employing the Stereospecific sodium salt glycosylation method. Glycosylation of the sodium salt of 6-chloro- and 2-amino-6-chloropurine (1 and 2, respectively) with 1-chloro-2-deoxy-3,5-di-O-(p-toluoyl)-α-D-erythro-pentofuranose (3) gave the corresponding
使用立体特异性钠盐糖基化方法已经完成了生物学上重要的2'-脱氧-6-硫鸟嘌呤(11),ara -6-硫鸟嘌呤(16)和ara G(17)的简单且高收率的合成。6-氯-和2-氨基-6-氯嘌呤(分别为1和2)的钠盐与1-氯-2-脱氧-3,5-二-O-(对甲苯甲酰基)-α-的糖基化D-赤型-五呋喃糖(3)给出了相应的N-9取代核苷,它们是具有β-端基异构体构型的主要产物(4和5,以及少量的N-7位置异构体(6和7)。在含有甲醇钠的甲醇中用硫化氢处理4,以93%的收率得到2'-deoxy-6-thioinosine(10)。类似地,将5以71%的产率转化为2'-脱氧-6-硫鸟苷(β-TGdR,11)。2的钠盐与1-氯-2,3,5-三-O-苄基-α-D-阿拉伯呋喃糖(8)的反应分别得到N-7和N-9糖基化产物13和9。9的脱苄基作用用三氯化硼在-78°下用62%的收率得到通用的中间体2-氨基-6-氯