Synthesis of gem-difluorinated nucleoside analogues of the liposidomycins and evaluation as MraY inhibitors
作者:Xiu-Hua Xu、Amy E. Trunkfield、Timothy D. H. Bugg、Feng-Ling Qing
DOI:10.1039/b713068f
日期:——
Two gem-difluoromethylenated nucleoside moieties of liposidomycins, 3 and 4, were designed and synthesized. Compound 3 was assembled from lactol5 and gem-difluoromethylenated nucleoside6. In the synthesis of target molecule 4, the coupling of the trichloroacetimidate derivative of gem-difluoromethylenated furanose7 with nucleoside8 in the presence of TMSOTf gave the unexpected compound 16 when CH3CN was used as solvent. This results from acetonitrile acting as a nucleophile and participating in the glycosylation reaction. This unusual process may be correlated with the presence of the electron-withdrawing gem-difluoro substituents at the C-2 position of furanose. Compound 3 demonstrated 29% inhibition of MraY at 11.4 mM.
两种含有gem-二氟亚甲基的核苷部分的脂肪霉素,3和4,进行了设计和合成。化合物3是由醇盐5和gem-二氟亚甲基核苷6组装而成。在目标分子4的合成中,gem-二氟亚甲基呋喃糖7的三氯乙酰亚胺衍生物与核苷8的耦合在TMSOTf的存在下,使用CH3CN作为溶剂时意外产生了化合物16。这是因为乙腈作为亲核试剂参与了糖苷化反应。这一异常过程可能与呋喃糖C-2位置上存在的吸电子gem-二氟取代基有关。化合物3在11.4 mM浓度下对MraY表现出29%的抑制作用。