P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Reductive Intramolecular Annulation of Benzoylformates Tethered with a Trisubstituted Alkene Unit and Synthesis of 2,2-Disubstituted 2<i>H</i>-Chromenes
作者:Jiayong Zhang、Yuhe Qiu、Biao Zhang、Zhiqiang Huang、Zhengjie He
DOI:10.1021/acs.orglett.1c00286
日期:2021.3.5
report, a P(NMe2)3-mediated reductive intramolecular annulation reaction has been developed with benzoyl formates bearing a trisubstituted alkene unit. It provides a facile synthesis of highly functionalized 2,2-disubstituted 2H-chromenes with a broad substratescope and high efficiency. Experimental results suggest this annulation reaction proceeds via a cascade of alkene isomerization/vinyl o-quinone
The synthesis, characterization and optical properties of novel 2-acyl 6-arylindolizines
作者:Yan Qing Ge、Xue Yong Gong、Guang Jie Song、Xiao Qun Cao、Jian Wu Wang
DOI:10.1016/j.saa.2014.06.146
日期:2015.1
A series of novel 2-acyl-6-aryl substituted indolizine derivatives was synthesized by a novel tandem reaction between 4-acyl-pyrrole-2-carbaldehyde derivatives and ethyl 4-bromo-3-arylbut-2-enoate under mild conditions. The compounds were characterized using IR, H-1 NMR C-13 NMR and HRMS. The crystal structure of 7a was determined using single crystal X-ray crystallography. The absorption results showed that compounds 7a-e presented their absorption maxima at ca. 270 nm, while compounds 7f and 7g with a larger conjugation system exhibited red-shifted absorption character (ca. 280 nm). Fluorescence spectra revealed that these compounds exhibited blue fluorescence (434-456 nm) in dilute solutions and showed quantum yields of fluorescence between 0.02 and 0.39 in dichloromethane. (C) 2014 Elsevier B.V. All rights reserved.