Synthesis of symmetric anhydrides using visible light-mediated photoredox catalysis
作者:Marlena D. Konieczynska、Chunhui Dai、Corey R. J. Stephenson
DOI:10.1039/c2ob25463h
日期:——
A new approach to anhydride formation is reported via activation of C–O bonds by the Vilsmeier–Haack reagent formed by Ru(bpy)3Cl2 and CBr4 in DMF. Various aryl and alkyl carboxylic acids are converted to the corresponding anhydrides in excellent yields.
Facile Synthesis of CarboxylicAnhydrides Using 4,5-Dichloro-2-[(4-nitrophenyl)sulfonyl]pyridazin-3(2<i>H</i>)-one
作者:Yong-Jin Yoon、Jeum-Jong Kim、Yong-Dae Park、Woo Song Lee、Su-Dong Cho
DOI:10.1055/s-2003-40512
日期:——
A novel and facile synthesis of carboxylic anhydrides from carboxylicacidusing 4,5-dichloro-2-[(4-nitrophenyl)sulfonyl[pyridazin-3(2H)-one (2) is presented. Treatment of aliphatic or aromaticcarboxylicacids with 2 in the presence of base in organic solvents gave the corresponding anhydrides in good or excellent yields.
Ligand-Free Palladium-Catalyzed Aerobic Oxidative Coupling of Carboxylic Anhydrides with Arylboronic Acids
作者:Weiyan Yin、Haifeng He、Yani Zhang、Tong Long
DOI:10.1002/asia.201402314
日期:2014.9
We report a new, effective and environmentally friendly protocol for selective aerobic oxidativecoupling of arylboronicacids with carboxylic anhydrides in the presence of ligand‐free palladium catalyst. The aryl benzoates are obtained in good to excellent yields.
A novel method for the mild photoredox‐mediated tandem radical acylarylation and tandem acylation/semipinacol rearrangement has been developed. The synthesis of highly functionalized ketones bearing all‐carbon α‐ or β‐quaternary centers has been achieved using easily available symmetric aromatic carboxylic anhydrides as the acyl radical source. The method allows for a straightforward introduction of
One-pot synthesis of thioesters with sodium thiosulfate as a sulfur surrogate under transition metal-free conditions
作者:Yen-Sen Liao、Chien-Fu Liang
DOI:10.1039/c8ob00178b
日期:——
In this paper, we report an efficient synthetic method for thioester formation fromsodium thiosulfate pentahydrate, organic halides, and aryl anhydrides. In the one-pot two-step reactions developed in this study, sodium thiosulfate was used as the sulfur surrogate for acylation with anhydrides, followed by substitution with organic halides through the in situ generation of thioaroylate. Furthermore