Transition-Metal-Free<i>N</i>-Arylation of Pyrazoles with Diaryliodonium Salts
作者:Zsombor Gonda、Zoltán Novák
DOI:10.1002/chem.201502995
日期:2015.11.16
developed for the N‐arylation of pyrazoles using diaryliodoniumsalts. The transformation does not require any transition‐metal catalyst and provides the desired N‐arylpyrazoles rapidly under mild reaction condition in the presence of aqueous ammonia solution as a mild base without the use of inert atmosphere. The chemoselectivity of unsymmetric diaryliodoniumsalts was also explored with large number
A phosgene‐ and metal‐free synthesis of O‐aryl carbamates is realized through a three‐component coupling of carbondioxide, amines and diaryliodoniumsalts. The reaction only requires a base as the promoter, providing access to a diverse array of O‐aryl carbamates in moderate to high yields with excellent chemoselectivity.
Domino <i>N</i>-/<i>C</i>- or <i>N</i>-/<i>N</i>-/<i>C</i>-arylation of imidazoles to yield polyaryl imidazolium salts <i>via</i> atom-economical use of diaryliodonium salts
作者:Shiqing Li、Hongxu Lv、Yu Yu、Xiuqing Ye、Baisong Li、Songming Yang、Yanru Mo、Xiangfei Kong
DOI:10.1039/c9cc05237b
日期:——
Herein, we disclose a Cu-mediated domino di-/triarylation reaction of imidazoles to efficiently access polyaryl imidazolium salts in a single step by using two aryls as well as an anion of a diaryliodonium salt. The diarylation shows high atom economy and excellent selectivity with unsymmetrical iodonium salts.
A practical, metal-free, and highly chemoselective approach was developed for the synthesis of ortho-CHO diaryl ethers by a three-component sequential coupling of arynes, N,N-dimethylformamide (DMF), and diaryliodoniumsalts. Diverse functional groups including halo, nitryl, and bulky substituents and heteroaromatics are well tolerated. Mechanistically, isotopic tracer experiments reveal that the diaryliodonium