A Forgotten Olefin: A Convenient One-pot Cascade Reaction Involving Suzuki–Miyaura and Mizoroki–Heck Couplings to Form (<i>E</i>)-1,2-Di(pyren-1-yl)ethylene
作者:Ken-ichi Yamashita、Keisuke Kimura、Shin Tazawa、Motoko S. Asano、Ken-ichi Sugiura
DOI:10.1246/cl.2011.1459
日期:2011.12.5
The addition of 0.5 equiv of vinylboronic acid pinacol ester I to 1-bromopyrene derivative 3 in the presence of [Pd(PPh3)4] and K2CO3 induced a cascade reaction involving Suzuki–Miyaura and Mizoroki–Heck couplings and afforded (E)-1,2-di(pyren-1-yl)ethylene derivative 1b. An alternative synthesis of 1b was carried out by an olefin metathesis. Formed 1b showed absorption bands in the visible region and a low oxidation potential attributable to a narrow HOMO–LUMO gap.
在[Pd(PPh3)4]和 K2CO3 的存在下,将 0.5 等量的乙烯基硼酸频哪醇酯 I 加入到 1-溴芘衍生物 3 中,引发了涉及 Suzukii-Miyaura 和 Mizoroki-Heck 偶联反应的级联反应,得到了 (E)-1,2-二(芘-1-基)乙烯衍生物 1b。1b 的另一种合成方法是烯烃偏析。生成的 1b 在可见光区域显示出吸收带,并由于 HOMO-LUMO 间隙较窄而具有较低的氧化电位。