已经报道了由2-甲氧基查耳酮环氧化物构造2-芳基苯并[ b ]呋喃的有效方法。2-甲氧基查尔酮环氧化物在2 mol%的BF 3 ·Et 2 O催化下进行Meerwein重排,然后在一锅中进行甲酰化反应,成功制得2-甲氧基脱氧安息香素。之后,通过2-甲氧基脱氧安息香与48%HBr的分子间环脱水,获得了高收率(87%–100%)的2-芳基苯并[ b ]呋喃。利用这种方法,可以方便地合成天然产物呋喃喃甲酸酯A和类花生四烯酸类化合物6的关键中间体。
Visible light mediated desilylative C(sp<sup>2</sup>)–C(sp<sup>2</sup>) cross-coupling reactions of arylsilanes with aryldiazonium salts under Au(<scp>i</scp>)/Au(<scp>iii</scp>) catalysis
作者:Indradweep Chakrabarty、Manjur O. Akram、Suprakash Biswas、Nitin T. Patil
DOI:10.1039/c8cc03925a
日期:——
Desilylative C(sp2)–C(sp2) cross-coupling reactions of arylsilanes with aryldiazonium salts under Au(I)/photoredox catalysis have been reported. The addition of Cu-salts as catalysts was found to be crucial for the success of this transformation.
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。
Scalable, Transition-Metal-Free Direct Oxime<i>O</i>-Arylation: Rapid Access to<i>O</i>-Arylhydroxylamines and Substituted Benzo[<i>b</i>]furans
O‐Aryloximes, generated from readily available and inexpensive oximes through transition‐metal‐free O‐arylation, can either be hydrolyzed to O‐arylhydroxylamines or conveniently converted to structurally diverse benzo[b]furans through an environmentally benign, one‐pot [3,3]‐sigmatropic rearrangement/cyclization sequence.
通过无过渡金属的O-芳基化反应从廉价和廉价的肟中生成的O-芳基肟可以水解为O-芳基羟胺,也可以通过对环境有益的单锅[3]方便地转化为结构多样的苯并[ b ]呋喃。 ,3]-σ重排/环化序列。
One-Pot Preparation of 2-Arylbenzofurans from Oximes with Diaryliodonium Triflate
作者:Hideo Togo、Kotaro Miyagi、Katsuhiko Moriyama
DOI:10.3987/com-14-13071
日期:——
A variety of 2-arylbenzofurans were obtained in good yields by the O-arylation of oximes with diaryliodonium triflates, followed by the treatment with HCl in dioxane under warming conditions through the [3,3]-sigmatropic reaction. The present reaction is one-pot transition metal-free method for the preparation of various 2-arylbenzofurans from oximes, which are easily available from the reaction of alkyl aryl ketones with hydroxylamine