One-pot synthesis of 5,5′-dibromo-2,2′-dipyridylacetylene and its boronic acid derivative
作者:Hyung Joon Jeon、Jung Hoon Choi、Jeung Ku Kang
DOI:10.1016/j.tetlet.2010.09.062
日期:2010.12
5,5′-Dibromo-2,2′-dipyridylacetylene was prepared from 2,5-dibromopyridine and (trimethylsilyl)acetylene via the new one-pot synthesis approach using a regioselective palladium-catalyzed coupling reaction with a 60% yield. Several protocols of lithium–halogen exchange were then attempted to synthesize 6,6′-(1,2-ethynediyl)bis[3-pyridylboronic acid] from 5,5′-dibromo-2,2′-dipyridylacetylene. The former
通过2,5-二溴吡啶和(三甲基甲硅烷基)乙炔,通过新的一锅合成方法,使用区域选择性钯催化的偶联反应,以60%的收率制备了5,5'-二溴-2,2'-二吡啶基乙炔。然后尝试了几种锂-卤素交换的方案,从5,5'-二溴-2,2'-二吡啶基乙炔合成6,6'-(1,2-乙炔二基)双[3-吡啶基硼酸]。前者是通过使用甲苯和THF的逆向添加方法成功获得的,产率为54%,它显示出潜力,可用于形成碳-碳键的交叉偶联反应。