Iron-Catalyzed Oxidative Cross-Coupling of Phenols and Alkenes
作者:Umesh A. Kshirsagar、Clil Regev、Regev Parnes、Doron Pappo
DOI:10.1021/ol401532a
日期:2013.6.21
A novel bioinspired iron-catalyzedoxidativecross-coupling reaction betweenphenols and conjugated alkenes was developed. This method enables the direct coupling of phenols with styrene, α-alkyl- and α-arylstyrenes, β-alkyl styrenes, and stilbenes, thereby providing a new strategy for the preparation of the pharmacologically important 2,3-dihydrobenzofuran motif. In addition, this study revealed that
Lewis Acid Mediated [3+2] Coupling of Masked Benzoquinones with Styrenes: Facile Synthesis of 2,3-Dihydrobenzofurans
作者:Rama Peddinti、Shivangi Sharma、Santosh Parumala
DOI:10.1055/s-0036-1588622
日期:——
We have developed an efficient, simple, mild, and rapid method for the construction of dihydrobenzofuran derivatives by the [3+2] coupling of masked o-benzoquinones with styrene derivatives triggered by boron trifluoride diethyl etherate. This new [3+2] coupling protocol proceeds smoothly to afford dihydrobenzofuran derivatives in good to high yields within one minute. The method was extended to cycloaddition
Covalent Triazine Framework Nanoparticles via Size‐Controllable Confinement Synthesis for Enhanced Visible‐Light Photoredox Catalysis
作者:Wei Huang、Niklas Huber、Shuai Jiang、Katharina Landfester、Kai A. I. Zhang
DOI:10.1002/anie.202007358
日期:2020.10.12
copolymerizing small amounts of benzothiadiazole into the conjugated molecular network. This optimization of electronic properties led to a further increase in observed photocatalytic efficiency, resulting in total an 18‐fold enhancement compared to the bulk material. Full recyclability of the heterogeneousphotocatalysts as well as catalyticactivity in dehalogenation, hydroxylation and benzoimidazole formation
Photocatalytic Synthesis of Dihydrobenzofurans by Oxidative [3+2] Cycloaddition of Phenols
作者:Travis R. Blum、Ye Zhu、Sarah A. Nordeen、Tehshik P. Yoon
DOI:10.1002/anie.201406393
日期:2014.10.6
We report a protocol for oxidative [3+2] cycloadditions of phenols and alkenesapplicable to the modular synthesis of a large family of dihydrobenzofuran natural products. Visible‐light‐activated transition metal photocatalysis enables the use of ammonium persulfate as an easily handled, benign terminal oxidant. The broad range of organic substrates that are readily oxidized by photoredox catalysis
Photocatalytic cycloadditions involving carbon–carbon bond formation in the absence of an external sensitizer are described. The use of a lithium perchlorate/nitromethaneelectrolytesolution exhibiting remarkable Lewis acidity is the key for the successful transformations.