Easily oxidizable triarylamine materials with naphthalene and binaphthalene core: structure–properties relationship
作者:Lukáš Kerner、Katarína Gmucová、Jozef Kožíšek、Václav Petříček、Martin Putala
DOI:10.1016/j.tet.2016.09.063
日期:2016.11
We devised and synthesized a series of electron-rich compounds featuring diphenylamine, carbazole or dibenzo[c,g]carbazole connected via phenylacetylene linkers to an aromatic central unit. The key synthetic step was a high yielding cross coupling reaction between halogenated (bi)naphthalene and organometallic reagents prepared in situ from terminal alkynes (side-arms). By masking one of the iodo functions
我们设计并合成了一系列具有二苯胺,咔唑或二苯并[ c,g通过苯基乙炔连接基连接到芳族中心单元上的]咔唑。关键的合成步骤是卤化(双)萘与由末端炔烃(侧臂)就地制备的有机金属试剂之间的高产率交叉偶联反应。通过在侧臂前体中用二乙基三氮烯基掩盖碘官能之一,我们有效地避免了双胺化副产物的形成。尽管延长了一步,但与直接偶联途径相比,这种方法导致最终炔烃的收率更高。由计算证据支持的光谱和电化学测量结果表明,在1,4-二取代的萘骨架中的共轭优于1,5或2,6取代的核。与咔唑类似物相比,二苯胺衍生物更容易被氧化。