copper(I)-catalyzed C-O/S coupling reactions of abundant aryl bromines with related phenols or thiophenols. The key to this very discovery is the identification of an N-donor tripod ligand (DPA), and such a reaction allows the conversion of simple starting materials to complexdiaryl ethers or diaryl thioethers, which are important synthetic intermediates in the preparation of bioactive molecules.
Room Temperature, Metal-Free Synthesis of Diaryl Ethers with Use of Diaryliodonium Salts
作者:Nazli Jalalian、Eloisa E. Ishikawa、Luiz F. Silva、Berit Olofsson
DOI:10.1021/ol200265t
日期:2011.3.18
A fast, high-yielding synthesis of diaryl ethers with use of mild and metal-free conditions has been developed. The scope includes bulky ortho-substituted diaryl ethers, which are difficult to obtain by metal-catalyzed protocols. Halo-substituents, racemization-prone amino acid derivatives, and heteroaromatics are also tolerated. The methodology is expected to be of high utility in the synthesis of complex molecules and in the pharmaceutical industry.