Palladium-Catalyzed Arylation of Fluoroalkylamines
作者:Andrew T. Brusoe、John F. Hartwig
DOI:10.1021/jacs.5b02512
日期:2015.7.8
fluoroalkylaniline products are unstable under typical conditions for C-N coupling reactions (heat and strong base). However, the reactions conducted with the weaker base KOPh, which has rarely been used in cross-coupling to form C-N bonds, occurred in high yield in the presence of a catalyst derived from commercially available AdBippyPhos and [Pd(allyl)Cl]2. Under these conditions, the reactions occur with low
[EN] PALLADIUM-CATALYZED ARYLATION OF FLUOROALKYLAMINES<br/>[FR] ARYLATION CATALYSÉE PAR LE PALLADIUM DE FLUOROALKYLAMINES
申请人:UNIV CALIFORNIA
公开号:WO2016183101A1
公开(公告)日:2016-11-17
Methods for synthesizing trifluoroethyl, difluoroethyl, pentafluoropropyl, and difluorophenethyl anilines by palladium-catalyzed coupling of fluoroalkylamines with aryl bromides and aryl chlorides are provided herein. The reaction is conducted with a weaker base such as KOPh in the presence of a catalyst derived from AdBippyPhos and [Pd(allyl)Cl]2. The reactions occur with catalyst loadings less than about 0.50 mol% and tolerate the presence of various functional groups that react with the strong bases that are typically used in Pd-catalyzed C-N cross coupling reactions of aryl halides. The resting state of the catalyst is the phenoxide complex, (BippyPhosPd(Ar)OPh); due to the electron-withdrawing property of the fluoroalkyl substituent, the turn-over limiting step of the reaction is reductive elimination to form the C-N bond.