A facile and improved synthesis of tubercidin and certain related pyrrolo[2,3-<i>d</i>]pyrimidine nucleosides by the stereospecific sodium salt glycosylation procedure
作者:Kandasamy Ramasamy、Nobutaka Imamura、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1002/jhet.5570250652
日期:1988.11
simple synthesis of tubercidin (1), 7-deazaguanosine (2) and 2′-deoxy-7-deazaguanosine (14) has been accomplished using the sodium salt glycosylation procedure. Reaction of the sodium salt of 4-chloro- and 2-amino-4-chloro-pyrrolo[2,3-d]pyrimidine, 3 and 4, respectively, with 1-chloro-2,3-0-isopropylidene-5-0-(t-butyl)dimethylsilyl-α-D-ribofuranose (5) gave the corresponding protected nucleosides 6n and
使用钠盐糖基化方法已经完成了结核菌素(1),7-脱氮鸟苷(2)和2'-脱氧-7-脱氮鸟苷(14)的简单合成。4-氯-和2-氨基-4-氯-吡咯并[2,3- d ]嘧啶的钠盐分别为3和4与1-氯-2,3- 0-异亚丙基-5-的反应0-(叔丁基)二甲基甲硅烷基-α-D-呋喃呋喃糖(5)给出了具有β-端基异构构型的相应的受保护核苷6n和7。取消保护6个提供的8,其在与甲醇氨一起加热后以优异的产率得到了结核菌素(1)。官能团7的转化,然后进行异异丙基化,得到2-氨基tubercidin(10)和2-氨基-7-β-D-呋喃呋喃糖基吡咯并[2,3- d ]嘧啶-4(3 H)-硫酮(11)。用1 N甲醇钠处理7,然后将其暴露于三氟乙酸水溶液中,并进行醚裂解,得到7-脱氮鸟苷(2)。还通过使用类似的反应顺序(采用4)制备了2'-Deoxy-7-deazaguanosine(14)和2'-deoxy-7-de