Absolute stereochemistry of antifouling cembranoid epimers at C-8 from the Caribbean octocoral Pseudoplexaura flagellosa. Revised structures of plexaurolones
作者:Edisson Tello、Leonardo Castellanos、Catalina Arevalo-Ferro、Jaime Rodríguez、Carlos Jiménez、Carmenza Duque
DOI:10.1016/j.tet.2011.09.094
日期:2011.11
7, and 8 have been reported previously, their structures and NMR assignments are revised, completed or corrected. The structures of these compounds were established on the basis of detailed analysis of their spectroscopic data. Furthermore, the relative configurations of compounds 1–3 and 7 were confirmed by single-crystal X-ray diffraction. The absolute configurations of compounds 1–8 were determined
在C-8(八个西松烷差向异构体1 - 8)从哥伦比亚加勒比海octocoral的有机提取物中分离Pseudoplexaura flagellosa。化合物2,4,和6报道首次。尽管化合物1,3,5,7,和8之前已经报道,它们的结构和NMR分配被修改,完成或校正。这些化合物的结构是在对其光谱数据进行详细分析的基础上确定的。此外,化合物的相对构型1 - 3通过单晶X射线衍射确认了图7和图7。化合物1 – 8的绝对构型是使用改良的Mosher方法和明确的化学相互转化方法确定的。使用群体感应的抑制(QSI)生物膜抑制生物测定其防污性能和评价结果表明,化合物3,6,和7具有针对优异的QSI活性紫色色杆菌,如通过抑制生产紫色杆菌素颜料的测量,而没有与它的增长的干扰。此外,化合物3,5,6,和8表现出抑制生物膜的成熟而不会干扰铜绿假单胞菌,哈维弧菌和金黄色葡萄球菌的生长。这是关于cembranoids作为细菌生物膜抑制剂和干扰C