Two-Step Synthesis of π-Expanded Maleimides from 3,4-Diphenylfuran-2(5<i>H</i>)-ones
作者:Yang Kang、Wei Zhang、Tao Wang、Yong Liang、Zunting Zhang
DOI:10.1021/acs.joc.9b01792
日期:2019.10.4
An efficient two-step synthesis of π-expanded maleimide derivatives was reported, which proceeded via a photoinduced dehydrogenative annulation of 3,4-diphenylfuran-2(5H)-ones in EtOH at room temperature for 5 h under an argon atmosphere, followed by interaction with primary amine in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene and O2. The synthesis of highly conjugated maleimides demonstrated
报道了一种有效的两步合成π扩展的马来酰亚胺衍生物的方法,该方法是通过在室温,氩气气氛下于EtOH中3,4-二苯基呋喃-2(5H)-ones的光诱导脱氢环化反应进行的,历时5 h。 1,8-二氮杂双环[5.4.0]十一碳-7-烯和O2存在下与伯胺的相互作用。高度共轭的马来酰亚胺的合成表明3,4-二苯基呋喃-2(5H)-ones是合成π膨胀内酯和π膨胀马来酰亚胺的有用前体,不需要过渡金属催化剂。另外,表征了高度共轭的马来酰亚胺的荧光性质,并发现其在二氯甲烷溶液中具有高的荧光量子产率。