Copper-catalyzed addition of water affording highly substituted furan and unusual formation of naphthofuran ring from 3-(1-alkenyl)-2-alkene-1-al
作者:Rathin Jana、Sunanda Paul、Anup Biswas、Jayanta K. Ray
DOI:10.1016/j.tetlet.2009.10.125
日期:2010.1
We have developed a novel one-pot reaction to generate highly substituted furan through the addition of water followed by oxidation and unusual cyclization to naphthofuran ring under the same reaction condition.
For the first time, the selective oxidative transformation of 2-naphthols with terminal alkynes is disclosed, which enables the straightforward synthesis of 2-arylnaphtho[2,1-b]furans in satisfactory yields under metal-free conditions. Mechanistic study suggests that the reaction proceeds via free-radical-mediated sp2-C–H bond activation, C–C coupling, and C–O cyclization.
首次公开了2-萘酚与末端炔烃的选择性氧化转化,其使得在无金属条件下以令人满意的产率直接合成2-芳基萘[2,1- b ]呋喃成为可能。机理研究表明,该反应通过自由基介导的sp 2 -C–H键激活,CC偶联和CO环化来进行。