We report a general, direct C–Harylation of anilide derivatives using reusable palladium or copper oxide on magnetite as heterogeneous precatalysts. Highly selective ortho and meta arylations are achieved using electronically and sterically diverse diaryliodonium salts. Catalytically active soluble species from the heterogeneous precursors were detected by experimental techniques. Preliminary mechanistic
Twofold C−H Functionalization: Palladium-Catalyzed <i>Ortho</i> Arylation of Anilides
作者:Gordon Brasche、Jorge García-Fortanet,、Stephen L. Buchwald
DOI:10.1021/ol800619c
日期:2008.6.5
The ortho arylation of anilides to form biphenyls via a twofold C-H functionalization/C-C bond-forming process is described. The oxidative coupling takes place in the presence of 5-10 mol % of Pd(OAC)(2), 10-20 mol % of DMSO, and 4-11 equiv of the aryl substrate in TFA under an oxygen atmosphere. No metal-containing cocatalyst is required.