作者:Shih-Wen Hsu、Hsiu-Yi Cheng、An-Chi Huang、Tse-Lok Ho、Duen-Ren Hou
DOI:10.1002/ejoc.201400064
日期:2014.5
The total synthesis of quebrachamine was achieved through the macrolactamization of cis-2-alkenylated indole 17, which was prepared by a Sonogashira reaction between indole 5b and piperidine 11 followed by cis-hydrogenation. We found that stoichiometric copper(I) iodide limited the undesired Glaser-type homocoupling of alkyne 11 that would otherwise take place during the Sonogashira coupling. This
quebrachamine 的全合成是通过 cis-2-alkenylated 吲哚 17 的大环内酰胺化实现的,它是通过吲哚 5b 和哌啶 11 之间的 Sonogashira 反应然后顺式氢化制备的。我们发现化学计量的碘化铜 (I) 限制了炔烃 11 的不需要的格拉泽型同偶联,否则会在 Sonogashira 偶联期间发生。这种直接方法允许从市售化学品开始以十个线性步骤进行全合成。氢化铝锂还原内酰胺 19 的条件是可调节的,因此可以制备 (±)-quebrachamine 或类似物 (±)-kopsiyunnanine D。