Synthesis of Pyrrolo[2,1,5-<i>cd</i>]indolizine Rings via Visible-Light-Induced Intermolecular [3+2] Cycloaddition of Indolizines and Alkynes
作者:Yu Zhang、Yue Yu、Bing-bing Liang、Yong-yan Pei、Xiang Liu、Hua-gang Yao、Hua Cao
DOI:10.1021/acs.joc.0c01253
日期:2020.8.21
smoothly underwent visible-light-induced intermolecular [3+2] annulations with internal alkynes to afford pyrrolo[2,1,5-cd]indolizine in good to excellent yields with high regioselectivity. Through this cascade reaction, a series of fluoroactive fused indolizines with a large π-system were conveniently synthesized. The usage of visiblelight as energy source with air as a stoichiometric oxidant under
一系列吲哚并嗪通过内部炔烃顺利地进行了可见光诱导的分子间[3 + 2]环空拆分,从而以良好的产率和良好的区域选择性提供了吡咯并[2,1,5- cd ]吲哚并嗪。通过该级联反应,方便地合成了具有大π系统的一系列含氟稠合吲哚嗪。在简单条件下使用可见光作为能源,以空气作为化学计量的氧化剂,使该过程具有吸引力和实用性。
Visible-Light-Induced Regioselective Dicarbonylation of Indolizines with Oxoaldehydes via Direct C–H Functionalization
作者:Lili Teng、Xiang Liu、Pengfeng Guo、Yue Yu、Hua Cao
DOI:10.1021/acs.orglett.0c01094
日期:2020.5.15
A metal-free system for regioselective dehydrogenative cross-couplings between indolizines and oxoaldehydes catalyzed by visible light under mild conditions has been described. As an atom economical and eco-friendly protocol, the reaction proceeds in good yields using inexpensive, readily available visible-light sources and the environmentally friendly oxidant oxygen. Various valuable 1,2-dicarbonyl
Photoinduced successive oxidative ring-opening and borylation of indolizines with NHC–boranes
作者:Huitao Zheng、Honggang Xiong、Chaobo Su、Hua Cao、Huagang Yao、Xiang Liu
DOI:10.1039/d1ra08072e
日期:——
A facile photoinduced successive oxidative ring-opening and borylation of indolizines with NHC–boranes via a one-pot method has been unveiled. This photo-promoted strategy enables the formation of unsaturated NHC–boryl carboxylates under transition metal-free and radical initiator-free conditions. A wide array of pyridine-containing NHC–boryl carboxylates were directly prepared in moderate to good
Mechanochemically Induced Dehydrogenation Coupling and [3+2] Cycloaddition of Indolizines with Allenes Using Piezoelectric Materials
作者:Mingzhou Huang、Lichan Deng、Tianfeng Lao、Ziwu Zhang、Zhengquan Su、Yue Yu、Hua Cao
DOI:10.1021/acs.joc.1c02940
日期:2022.3.4
wide range of indolizines with allenes proceeded smoothly under mechanochemically induced conditions via a [3+2] annulation process, affording various substituted pyrrolo[2,1,5-cd]indolizines in good yields. The reaction efficiency was greatly improved by using piezoelectricmaterial as the charge transfer catalyst. The photophysical properties of the resulting pyrrolo[2,1,5-cd]indolizine were characterized