2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-Mediated Tandem Oxidative-Coupling/Annulation of o-Hydroxyaryl Enaminones with Cycloheptatriene
作者:Dongping Cheng、Xiaoliang Xu、Yueqi Pu、Mingliang Wang、Yinqiang Shen、Jing Shen、Jizhong Yan
DOI:10.1055/s-0040-1705973
日期:2021.4
A DDQ-mediated tandem reaction of easily available o-hydroxyaryl enaminones and cycloheptatriene is disclosed. It provides an effective and convenient method for the synthesis of 3-(cycloheptatrienyl)-substituted chromones in moderate to excellent yields with good functional group tolerance; this reaction involves an oxidative coupling and intramolecular annulation pathway.
Cascade <i>in Situ</i> Iodination, Chromone Annulation, and Cyanation for Site-Selective Synthesis of 2-Cyanochromones
作者:Yan Lin、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.joc.3c00206
日期:2023.3.17
A facile cascade reaction for the site selective synthesis of 2-cyanochromones is described. By using simple o-hydroxyphenyl enaminones and potassium ferrocyanide trihydrate (K4[Fe(CN)6]3·3H2O) as starting materials and I2/AlCl3 as promoters, the products are furnished via tandem chromone ring formation and C–H cyanation. The in situ formation of 3-iodochromone and a formal 1,2-hydrogen atom transfer
Electrochemical-induced solvent-tuned selective C(sp3)–H bond activation towards the synthesis of C3-functionalized chromone derivatives
作者:Ying Gao、Mingxu Wang、Jingxian Sun、Xiao-Jing Zhao、Yonghui He
DOI:10.1039/d4cc00919c
日期:——
An unprecedented solvent-tuned electrochemical method for selective C(sp3)–H bond activation towards the synthesis of C3 functionalized chromonederivatives has been developed. This electrosynthesis protocol provides an efficient and green way to access various C3-functionalized chromones by avoiding traditionally employed transition metals and high temperatures. The swappable chemoselectivity was
Synthesis, optical properties, and application of novel chalcone skeleton as pH fluorescent probe: Based AIE + ESIPT strategy
作者:Xiao-Tian Wu、Ying-Ying Zheng、Shan-Shan Ma、Shu-Heng Ai、Qi-Wang Zhou、Di Yang、Chen Ma
DOI:10.1016/j.saa.2024.124199
日期:2024.6
series of “turn off” pH fluorescence probes with chalcone skeleton for basic system have been developed. The molecules emitted bright yellow fluorescence under acidic condition, resulting AIE coupled ESIPT characteristic and ICT process. What’s more, the compounds exhibited excellent sensitivity and selectivity for detecting pH as a facile “On-Off” fluorescence probe, and the fluorescence of them were