tuberculosis, including several multidrug resistant strains. The configuration of all but one of the stereogenic centers of gladiolin has previously been elucidated using a combination of NOESY NMR experiments and predictive sequence analysis of the polyketide synthase responsible for its assembly. However, it was not possible to assign the configuration of the C-35 methyl group using such methods. Here we report
唐diol蒲素是一种从大伯克霍尔德氏菌BCC0238中分离出来的大环
内酯类抗生素,具有抗结核分枝杆菌(包括几种耐多药菌株)的有前途的活性。之前已使用NOESY NMR实验和负责组装的聚酮化合物合酶的预测序列分析相结合,阐明了格拉迪林除立体异构中心以外的所有立体构型中心的构型。然而,使用这种方法不可能分配C-35甲基的构型。这里,我们报告C-33 / C-35-的合成顺式和C-33 / C-35-反的模拟物C-30从(到gladiolin的C-38片段- [R )和(小号)-
香茅醇。比较模拟物和
天然产物的HSQC NMR数据,结果表明C-35甲基抗C-33羟基,表明格拉迪林具有35 S构型。