First examples of 2,6-diarylnicotinaldehydes prepared under conventional and microwave conditions
摘要:
Enaminoketones undergo unexpected self condensation in acetic acid to produce a wide range of 2,3,6-trisubstituted pyridine derivatives in excellent yields in the presence of NH4OAc. This is the first Letter on the synthesis of 2,6-diarylnicotinaldehydes. The reaction was studied under microwave irradiation and conventional heating. However, mixed condensations were observed when two different enaminones are combined. (C) 2015 Published by Elsevier Ltd.
A Facile and General Approach to 3-((Trifluoromethyl)thio)-4<i>H</i>-chromen-4-one
作者:Haoyue Xiang、Chunhao Yang
DOI:10.1021/ol502751k
日期:2014.11.7
A facile and efficient synthetic strategy to 3-((trifluoromethyl)thio)-4H-chromen-4-one was developed. AgSCF3 and trichloroisocyanuric acid were employed here to generate active electrophilic trifluoromethylthio species in situ. This reaction could proceed under mild conditions in a short reaction time and be insensitive to air and moisture.
开发了一种简便有效的合成3-((三氟甲基)硫代)-4 H -chromen-4-one的策略。这里使用AgSCF 3和三氯异氰尿酸原位产生活性的亲电子三氟甲硫基物质。该反应可在温和的条件下在短的反应时间内进行,并且对空气和湿气不敏感。
Visible-light-mediated arylation of <i>ortho</i>-hydroxyarylenaminones: direct access to isoflavones
作者:Satenik Mkrtchyan、Viktor O. Iaroshenko
DOI:10.1039/c9cc09945j
日期:——
The first visible-light-promoted direct synthesis of isoflavones following the arylation of ortho-hydroxyarylenaminones by aryl onium salts was developed.
2,3-Unsubstituted chromones and their enaminone precursors as versatile reagents for the synthesis of fused pyridines
作者:Viktor O. Iaroshenko、Satenik Mkrtchyan、Ashot Gevorgyan、Mariia Miliutina、Alexander Villinger、Dmytro Volochnyuk、Vyacheslav Ya. Sosnovskikh、Peter Langer
DOI:10.1039/c1ob06494k
日期:——
A divergent and regioselective approach to fused pyridines was developed through formal [3 + 3] cyclocondensations from simple 2,3-unsubstituted chromones or their enaminone precursors.
Selectfluor-Triggered Tandem Cyclization of <i>o</i>-Hydroxyarylenaminones To Access Difluorinated 2-Amino-Substituted Chromanones
作者:Qinglan Zhao、Haoyue Xiang、Jun-An Xiao、Peng-Ju Xia、Jun-Jie Wang、Xiaoqing Chen、Hua Yang
DOI:10.1021/acs.joc.7b01339
日期:2017.9.15
difluorinated 2-amino-substituted chromanones. This novel protocol features mild reaction conditions, operational simplicity, and broad substrate scope. The enamine moiety in o-hydroxyarylenaminone played dual roles to enable high efficiency in the difluorination and intramolecular cyclization, leading to the accomplishment of a new class of difluorinated 2-amino-substituted chromanones for pharmaceutical studies
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