One-Step Synthesis of Substituted Benzofurans from <i>ortho</i>
- Alkenylphenols <i>via</i>
Palladium-Catalyzed CH Functionalization
作者:Dejun Yang、Yifei Zhu、Na Yang、Qiangqiang Jiang、Renhua Liu
DOI:10.1002/adsc.201600082
日期:2016.6.2
A dehydrogenative oxygenation of C(sp2)H bonds with intramolecular phenolic hydroxy groups has been developed, which provides a straightforward and concise access to structurally diversely benzofuransfrom ortho‐alkenylphenols. The reaction is catalyzed by palladium on carbon (Pd/C) without any oxidants and sacrificing hydrogen acceptors.
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。
Benzofurans Prepared by CH Bond Functionalization with Acylsilanes
作者:Zengming Shen、Vy M. Dong
DOI:10.1002/anie.200804854
日期:2009.1.12
Instant carbenes—that's hot: The thermal 1,2‐Brook rearrangement of acylsilanes generates siloxycarbene intermediates that can undergo intramolecular CHbond insertion to provide benzofuran derivatives. This metal‐free tandem reaction occurs in less than 10 minutes in the microwave.
Unexpected detection of 3-aroylbenzofuran side products in the preparation of 2-arylbenzofurans: Identification, characterization, and comparison with chalcone's fragmentation patterns using EI/MS<sup>n</sup>
作者:Michela Begala、Giovanna Lucia Delogu
DOI:10.1002/jms.4425
日期:2019.9
ran, on the base of its mass spectrometric behaviour using a combination of electron ionization, exact mass measurement, multiple stage mass spectrometry, and labelled compounds. This study reports the common fragmentation pathways and discusses possible fragment structures of characteristic ions from a series of 3-aroyl-2-arylbenzofuran derivatives obtained as by-product under Wittig conditions. Emphasis
The ring-opening reaction of benzofuran is a highly desirable, yet underdeveloped transformation for the construction of valuable phenol derivatives. Herein, we report a nickel-catalyzed ring-opening transformation of benzofuran with silanes, giving ortho-alkene-, branched/linear alkyl silane-, and alkenyl silane-substituted phenol derivatives selectively. Control experiments and DFT calculations supported