Efficient Atropodiastereoselective Access to 5,5′-Bis-1,2,3-triazoles: Studies on 1-Glucosylated 5-Halogeno 1,2,3-Triazoles and Their 5-Substituted Derivatives as Glycogen Phosphorylase Inhibitors
作者:David Goyard、Aikaterini S. Chajistamatiou、Anastasia I. Sotiropoulou、Evangelia D. Chrysina、Jean-Pierre Praly、Sébastien Vidal
DOI:10.1002/chem.201304989
日期:2014.4.25
type. Attempts to achieve Heck coupling to methyl acrylate failed, but a stable palladium‐associated triazole was isolated and analyzed by 1H NMR and MS. O‐Unprotected derivatives were tested as inhibitors of glycogen phosphorylase. The modest inhibition activities measured showed that 4,5‐disubstituted 1‐glucosyl‐1,2,3‐triazoles bind weakly to the enzyme. This suggests that such ligands do not fit
乙酰化的β- D之间的铜催化的叠氮化物-炔烃环加成反应(CuAAC)葡糖基叠氮化物和烷基或苯基乙炔以良好的收率产生相应的4取代的1葡糖基1,2,3-三唑,使用相似的条件,但使用2当量的CuI或CuBr生成5卤代类似物(> 71%)。相比之下,当使用2当量的CuCl和乙酸炔丙酯或苯基乙炔时,主要产物(> 56%)表现出两个由5-5'-连接的三唑环,这是由于1-葡糖基-4-取代的1,2,3的均偶联而产生的三唑 NMR光谱分析表明,4-苯基取代的化合物(乙酰化,O-未保护基)和乙酰化的4-乙酰氧基甲基衍生物以单一形式(dr> 95:5)存在于溶液中。X射线衍射分析首次明确地确定了两个被4-苯基取代的结构,是具有R的阻转异构体立体化学。这代表了以葡萄糖为基础的双三唑作为单一阻转异构体的首批有效且高度阻转非对映选择性的方法之一。产物通过标准硅胶色谱纯化。通过Sonogashira或Suzuki交叉偶联,1-葡萄糖基-5-卤代1