title: Mechanistic study of copper-catalyzed aerobic oxidative coupling of arylboronic esters and methanol: insights into an organometallic oxidase reaction.
abstract: Copper-catalyzed aerobic oxidative coupling of arylboronic acid derivatives and heteroatom nucleophiles is a highly useful method for the formation of aryl-heteroatom bonds. Mechanistic studies reveal that this reaction proceeds via an "oxidase"-style mechanism. Kinetic and spectroscopic studies establish that transmetalation of the aryl group from boron to Cu(II) is the turnover-limiting step and reoxidation of the reduced catalyst by O(2) is rapid. Further mechanistic analysis implicates the involvement of an aryl-copper(III) intermediate that undergoes facile C-O bond formation.
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.
authors.forename: Amanda E
authors.initials: AE
authors.lastname: King
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Brunold
authors.forename: Shannon S
authors.initials: SS
authors.lastname: Stahl
mesh_terms: D001896:Boron Compounds / Q000737:chemistry*; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004952:Esters / Q000737:chemistry*; D007700:Kinetics; D000432:Methanol / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*
chemical_list: D001896:Boron Compounds; D004952:Esters; D003300:Copper; D010100:Oxygen; D000432:Methanol