Copper-Catalyzed Coupling of Hydroxylamines with Aryl Iodides
作者:Kerri L. Jones、Achim Porzelle、Adrian Hall、Michael D. Woodrow、Nicholas C. O. Tomkinson
DOI:10.1021/ol7029273
日期:2008.3.1
An efficient method for the copper-catalyzed N-arylation of hydroxylamines with aryliodides is described. A variety of N- and O-functionalized hydroxylamines were transformed in good to excellent yield with a broad range of arylcoupling partners. Methods for the selective deprotection of either the N- or O-substituents for further functionalization are also described.
Reaction of substituted N-aryl hydroxylamines with methanesulfonyl chloride, p-toluenesulfonyl chloride, or trifluoromethanesulfonic anhydride under basic conditions leads to the rearranged 2-aminophenols (45-94%). The overall reaction sequence can be performed using polymer-supported sulfonyl chloride resin allowing for the effective conversion of N-aryl hydroxylamines to the 2-aminophenols without the need for chromatography.