Carboxylation of Aryl Triflates with CO<sub>2</sub> Merging Palladium and Visible-Light-Photoredox Catalysts
作者:Samir Kumar Bhunia、Pritha Das、Shantanu Nandi、Ranjan Jana
DOI:10.1021/acs.orglett.9b01532
日期:2019.6.21
visible-light-promoted, highly practical carboxylation of readily accessible aryl triflates at ambient temperature and a balloon pressure of CO2 by the combined use of palladium and photoredox Ir(III) catalysts. Strikingly, the stoichiometric metallic reductant is replaced by a nonmetallic amine reductant providing an environmentally benign carboxylation process. In addition, one-potsynthesis of a carboxylic
Palladium-Catalyzed Conversion of Aryl and Vinyl Triflates to Bromides and Chlorides
作者:Xiaoqiang Shen、Alan M. Hyde、Stephen L. Buchwald
DOI:10.1021/ja107481a
日期:2010.10.13
The palladium-catalyzed conversion of aryl and vinyltriflates to aryl and vinyl halides (bromides and chlorides) has been developed using dialkylbiaryl phosphine ligands. A variety of aryl, heteroaryl, and vinyl halides can be prepared via this method in good to excellent yields.
Aryl–secondary alkyl cross-coupling with aryl sulfonate esters as coupling partners remains a significant challenge. Efficient cross-coupling between aryl/alkenyl triflates and acyclicsecondary alkylboronic acids is realized for the first time to provide a series of sterically congested acyclicsecondary alkyl arenes/olefins in good to excellent yields. The employment of sterically bulky P,PO ligand L1/L2 is
Formation of ArF from LPdAr(F): Catalytic Conversion of Aryl Triflates to Aryl Fluorides
作者:Donald A. Watson、Mingjuan Su、Georgiy Teverovskiy、Yong Zhang、Jorge García-Fortanet、Tom Kinzel、Stephen L. Buchwald
DOI:10.1126/science.1178239
日期:2009.9.25
currently in use is of great interest. We have prepared [LPd(II)Ar(F)] complexes, where L is a biaryl monophosphine ligand and Ar is an aryl group, and identified conditions under which reductive elimination occurs to form an Ar-F bond. On the basis of these results, we have developed a catalytic process that converts aryl bromides and aryl triflates into the corresponding fluorinated arenes by using simple