A Unified and Practical Method for Carbon–Heteroatom Cross‐Coupling using Nickel/Photo Dual Catalysis
作者:Randolph A. Escobar、Jeffrey W. Johannes
DOI:10.1002/chem.202000052
日期:2020.4.21
While carbon-heteroatom cross-couplingreactions have been extensively studied, many methods are specific and limited to a particular set of substrates or functional groups. Reported here is a general method that allows for C-O, C-N and C-Scross-couplingreactions under one general set of conditions. We propose that an energy transfer pathway, in which an iridium photosensitizer produces an excited
Palladium-Catalyzed 2,2,2-Trifluoroethoxylation of Aromatic and Heteroaromatic Chlorides Utilizing Borate Salt and the Synthesis of a Trifluoro Analogue of Sildenafil
作者:Bálint Pethő、Márton Zwillinger、János T. Csenki、Anna E. Káncz、Balázs Krámos、Judit Müller、György T. Balogh、Zoltán Novák
DOI:10.1002/chem.201704205
日期:2017.11.7
A simple and convenient method was developed for the introduction of a 2,2,2‐trifluoroethoxy group to various aromatic and heteroaromatic systems. The novel process utilizes aromatic chlorides as substrates, and tetrakis(2,2,2‐trifluoroethoxy) borate salt as an inexpensive and readily available fluoroalkoxy source in a palladium‐catalyzed cross‐coupling reaction. The power of the developed methodology
A convenient and practical method for the preparation of fluoroalkylarylethers via substitution of iodoalkyl fluorides is described. This method involves KF complexation of the phenol, which increases the nucleophilicity of oxygen for the formation of the ether linkage.