2,3‐Dichloro‐5,6‐Dicyano‐1,4‐Benzoquinone (DDQ)‐Mediated Tandem Oxidative Coupling/Intramolecular Annulation/Dehydro‐Aromatization for the Synthesis of Polysubstituted and Fused Pyridines
作者:Dongping Cheng、Zhiteng Deng、Xianhang Yan、Mingliang Wang、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201900956
日期:2019.11.5
A DDQ‐mediated tandem reaction of 1,3‐diarylpropenes and β‐enaminoesters/4‐aminocoumarins is disclosed. It involves oxidative coupling, intramolecular annulation and dehydro‐aromatization reaction, which provides an efficient and mild method for the synthesis of polysubstituted and fused pyridines under metal‐free conditions.
Transition-metal free C(sp<sup>2</sup>)–C(sp<sup>2</sup>) bond formation: arylation of 4-aminocoumarins using arynes as an aryl source
作者:Abhilash Sharma、Pranjal Gogoi
DOI:10.1039/c9ob01919g
日期:——
A mild, efficient and transition-metal free synthetic strategy has been developed for the α-arylation of 4-aminocoumarins using arynes as an aryl source. This synthetic strategy proceeds via C(sp2)–C(sp2) bond formation between 4-aminocoumarins and aryne precursors in a single step in the absence of a metal-catalyst.
Acetic acid promoted an efficient and eco-friendly one-pot synthesis of functionalized novel isoxazolyl amino chromenopyrrole derivatives in aqueous medium
作者:Nallamothu Vanaja Rani、Ravindhranath Kunta
DOI:10.1080/00397911.2020.1846058
日期:2021.2.16
An efficient, economical, and environmentally friendly method has been reported for one-potsynthesis of isoxazolyl amino chromenopyrrole derivativesfrom 4-amino-3-methyl-5-styrylisoxazoles, aryl ...
An effective tandem reaction of 4-aminocoumarins and 1,3-diarylpropenes mediated by Cu(OTf)2/TBHP (tert-butyl hydroperoxide)/O2 that provides various benzopyrano[4,3-b]pyridines in moderate to good yields is disclosed. The reaction proceeds through oxidative coupling, intramolecular cyclization, and dehydro-aromatization. This approach has the advantages of high atom-economy, environmental compatibility
2,3-Dichloro-5,6-dicyano-1,4-benzoquinone(DDQ)/Tert-butyl nitrite(TBN)/O2-mediated tandem reaction for the synthesis of 1-aza-anthraquinones and pyridocoumarins
reaction of 2-aminonaphthoquinone/4-aminocoumarins with 1,3-diarylpropenes mediated by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)/tert-butyl nitrite (TBN)/O2 is disclosed. It involves oxidativecoupling, intramolecular annulation and dehydro-aromatization reaction, which provides an efficient and mild method for the synthesis of 1-aza-anthraquinones and pyridocoumarins.