antibacterial nucleoside natural products, was conducted by scaffold-hopping of the structurally complex diazepanone moiety to the isoxazolidine scaffold. The designed isoxazolidine-containing uridine derivatives were synthesized by an intramolecular 1,3-dipolar cycloaddition of alkenyl nitrone as a key step. The lactone-fused isoxazolidine intermediate was easily converted to the target compounds by
通过将结构复杂的二氮杂one酮部分跃迁到
异恶唑烷骨架上,简化了有前途的抗菌核苷
天然产物辣椒素的简化。通过烯内酮的分子内1,3-偶极环加成反应合成了设计的含
异恶唑烷的
尿苷衍
生物。内酯稠合的
异恶唑烷中间体通过亲核取代和亲电子封端所得伯醇使内酯部分开环后,通过依次引入关键取代基,可以轻松地将其转化为目标化合物。几种类似物对流感嗜血杆菌A
TCC 10211(MIC 0.25-0.5杯mL(-1))表现出良好的活性,对耐
万古霉素的屎肠球菌SR7914(MIC 4-8杯mL(-1))表现出中等的活性。