Synthesis and Molecular Structure of New S-Nucleosides of 5-(4-Pyridyl)-4-Aryl-4<i>H</i>-1,2,4-Triazole-3-Thiols
作者:Huan-Huan Zhang、Xiu-Qin Hu、Gui-Fang Fan、Peng-Fei Xu
DOI:10.1002/jccs.200800124
日期:2008.8
The synthesis of some new S-nucleosides of 5-(4-pyridyl)-4-aryl-4H-1,2,4-triazole-3-thiols (4a-n) is described. Direct glycosylation of (4a-n) with tetra-O-acetyl-a-D-glucopyranosyl bromide in the presence of potassium hydroxide followed by deacetylation using dry ammonia in methanol gave the corresponding 3-S-(β-D-glucopyranosyl)-5-(4-pyridyl)-4-aryl-4H-1,2,4-triazoles (6a-n) in good yields. All the
描述了 5-(4-pyridyl)-4-aryl-4H-1,2,4-triazole-3-thiols (4a-n) 的一些新的 S-核苷的合成。在氢氧化钾存在下,用四-O-乙酰基-aD-吡喃葡萄糖基溴将(4a-n)直接糖基化,然后用甲醇中的无水氨脱乙酰基,得到相应的3-S-(β-D-吡喃葡萄糖基)-5- (4-吡啶基)-4-芳基-4H-1,2,4-三唑(6a-n),收率良好。通过 1 H NMR、 13 C NMR 光谱和元素分析对所有化合物进行了充分表征。为了帮助解释光谱数据,3-S-(2',3',4',6'-四-O-乙酰基-β-D-吡喃葡萄糖基)-5-(4-吡啶基)的晶体结构)-4-苯基-4H-1,2,4-三唑(5a)通过X射线衍射测定。