作者:Ian Paterson、David Yu-Kai Chen、Alison S. Franklin
DOI:10.1021/ol017082w
日期:2002.2.1
The spirocyclic core of the siphonarins was constructed by a directed cyclization of a linear triketone, prepared using a Sn(II)-mediated aldol coupling and Swern oxidation at C9 and C13. To circumvent a facile retro-Claisen pathway generating a baconipyrone-type ester, a Ni(II)/ Cr(II)-mediated coupling reaction with vinyl iodide was used to complete the first synthesis of siphonarin B and dihydrosiphonarin
通过使用Sn(II)介导的羟醛偶联和在C9和C13处的Swern氧化制备的线性三酮,通过直接环化来构建虹吸素的螺环核心。为了规避生成baconipyrone型酯的简便的逆克莱森途径,使用Ni(II)/ Cr(II)介导的与碘乙烯的偶联反应完成了虹吸素B和二氢虹吸素B的首次合成。还制备了不能与虹吸蛋白骨架平衡的药物。