Palladium-Catalyzed Addition of Potassium Aryltrifluoroborates to Aliphatic Nitriles: Synthesis of Alkyl Aryl Ketones, Diketone Compounds, and 2-Arylbenzo[<i>b</i>]furans
developed, leading to a wide range of alkylarylketones with moderate to excellent yields. Moreover, several dinitriles (e.g., malononitrile, glutaronitrile, and adiponitrile) were applicable to this process for the construction of 1,3-, 1,5-, or 1,6-dicarbonyl compounds. The scope of the developed approach is successfully explored toward the one-step synthesis of 2-arylbenzo[b]furans via sequential
已经开发了钯催化的芳基三氟硼酸钾加成到脂肪族腈中的方法,从而产生了范围广泛的烷基芳基酮,并具有中等至极好的收率。此外,几种二腈(例如丙二腈,戊二腈和己二腈)适用于该方法,用于构建1,3-,1,5-或1,6-二羰基化合物。通过顺序加成和分子内环化反应,一步一步合成2-芳基苯并[ b ]呋喃已成功探索了所开发方法的范围。该方法学接受了广泛的底物,并适用于文库合成。
Catalyst-Free Synthesis of Benzofuran Derivatives from Cascade Reactions between Nitroepoxides and Salicylaldehydes
作者:Mohammad A. Ranjbari、Hossein Tavakol
DOI:10.1021/acs.joc.1c00143
日期:2021.3.19
Different benzofuran derivatives are synthesized via a catalyst-free reaction between nitroepoxides and salicylaldehydes. In the employed methodology, K2CO3 and DMF have been used at 110 °C, and the reactions were completed after 12 h in 33–84% yields. The highest yields were obtained using 3-nitrosalicylaldehyde. Finally, a plausible mechanism was proposed for the reaction, and some evidence was provided
通过硝基环氧化物和水杨醛之间的无催化剂反应合成不同的苯并呋喃衍生物。在所采用的方法中,已在110°C下使用K 2 CO 3和DMF,反应12小时后以33-84%的收率完成反应。使用3-硝基水杨醛可获得最高的收率。最后,提出了一种可行的反应机理,并为该机理提供了一些证据,例如检测释放的乙酸根阴离子(使用FTIR)以及分离和确定关键中间体的结构。
2-Phenylbenzo[ b ]furans: Synthesis and promoting activity on estrogen biosynthesis
2-phenylbenzo[b]furan glycosides could promote estrogen biosynthesis. To find high active 2-phenylbenzo[b]furans, fifty-four 2-phenylbenzo[b]furans were prepared via four strategies according to corresponding substrate scopes. Biological evaluation in HEK293A cells showed that some compounds exhibited promotive activity on estrogen biosynthesis. 2-(4-Chlorophenyl)-7-methoxybenzo[b]furan possessed the
Copper-catalyzed decarboxylative intramolecular C–O coupling: synthesis of 2-arylbenzofuran from 3-arylcoumarin
作者:Wen-Chen Pu、Guan-Min Mu、Guo-Lin Zhang、Chun Wang
DOI:10.1039/c3ra46414h
日期:——
A copper-catalyzed decarboxylative intramolecular CâO coupling reaction was established. Under aerobic conditions in the presence of cupric chloride/1,10-phenathroline, a variety of 2-arylbenzofurans were prepared from 3-arylcoumarins in one-pot with yields from 26% to 84%.
Palladium-catalyzed cross-couplings of functionalized 2-bromobenzofurans for atom-economic synthesis of 2-arylbenzofurans using triarylbismuth reagents
作者:Maddali L.N. Rao、Dheeraj K. Awasthi、Jalindar B. Talode
DOI:10.1016/j.tetlet.2012.03.059
日期:2012.5
The palladium catalyzed, atom-economic synthesis of various functionalized 2-arylbenzofurans was achieved through cross-coupling reaction of 2-bromobenzofurans with triarylbismuth reagents. The palladium catalytic protocol is very efficient to furnish various cross-coupled functionalized 2-arylbenzofurnas in high yields using triarylbismuth reagents with three aryl couplings as multi-coupling organometallic nucleophiles in one-pot operation. All the coupling reactions were completed in 1 h short reaction time involving three couplings from triarylbismuths under heating condition. (C) 2012 Elsevier Ltd. All rights reserved.