Synthesis of tricyclic benzimidazole-iminosugars as potential glycosidase inhibitors via a Mitsunobu reaction
作者:Lianhai Yan、Hui Lui、Jiajing Sun、Ligang Gao、Xin Lu、Xiaoliu Li、Hua Chen
DOI:10.1016/j.carres.2019.107807
日期:2019.11
iminosugar in satisfactory yield. The results of the glycosidase inhibitory activities of 1 and 2 showed that three compounds derived from d-ribose exhibited specific and good inhibitory effects on β-glucosidase. Among them, 1e-1 was the best one with IC50 value of 5.37 μM. All hydroxyl groups on β-position would be favourable to the inhibitory activity of such tricyclic benzimidazole-iminosugars against
合成了一系列三环苯并咪唑-亚氨基糖1(af)和2(af),并评估了它们对五种糖苷酶的抑制活性。合成从苄基保护的糖(醛)5开始,该糖与1,2-二氨基苯反应,通过碘诱导的氧化缩合反应生成醛基苯并咪唑6。然后,通过未保护的OH和NH在6中的分子内环化,通过关键的Mitsunobu反应,以73%-87%的高收率获得三环化合物7。在CF3SO3H中除去苄基后,目标三环苯并咪唑-亚氨基糖1和2实现了。该方案对于令人满意的产率的三环亚氨基糖的制备是有效的。1和2的糖苷酶抑制活性的结果表明,衍生自d-核糖的三种化合物对β-葡萄糖苷酶表现出特异性和良好的抑制作用。其中1e-1是最好的,IC50值为5.37μM。β位上的所有羟基将有利于这种三环苯并咪唑-亚氨基糖对β-葡萄糖苷酶的抑制活性。