作者:James A. Marshall、Gregory M. Schaaf
DOI:10.1021/jo0348930
日期:2003.9.1
hydrogenolysis of the derived bromide 19. Hydrostannation of the terminal alkyne converted 21 to 22, which was then treated with iodine to afford the vinyl iodide 23. The dihydropyranone precursor 40 was prepared by addition of allenystannane 29 to aldehyde 27. Partial hydrogenation of the derived propargylic alcohol then protection as the TBS ether afforded the (Z)-olefin 34. Further homologation was effected
描述了呋喃呋喃丁酮D的收敛的全合成。通过将衍生自甲磺酸酯12的手性烯丙基锌试剂添加到手性醛11中,组装线性聚酮化合物C12-C24片段。将加合物13定向加氢氢化,然后进行碘裂解和Sonogashira偶联,生成烯炔16,将其转化为苯乙炔。通过衍生的溴化物19的氢解,将甲基取代的烯基20甲基化。将末端炔烃转化为21到22的炔烃进行氢化,然后用碘进行处理,得到乙烯基碘23。二氢吡喃酮前体40是通过将烯丙基锡烷29添加到醛中而制得的27.将衍生的炔丙醇部分氢化,然后将其作为TBS醚进行保护,得到(Z)-烯烃34。通过醛36与衍生自溴化phospho37的叶立德的维特希缩合反应实现进一步的同源性。38的伯TES醚的选择性脱保护,然后将醇39转化为碘40,完成了C1-C11链段的合成。由碘化物40制备的硼酸酯41与乙烯基碘化物23的Suzuki偶联生成二烯42,具有上呋喃丹D的完整碳骨架。通过氧化未