title: Catalytic conjunctive cross-coupling enabled by metal-induced metallate rearrangement.
abstract: Transition metal catalysis plays a central role in contemporary organic synthesis. Considering the tremendously broad array of transition metal-catalyzed transformations, it is remarkable that the underlying elementary reaction steps are relatively few in number. Here, we describe an alternative to the organometallic transmetallation step that is common in many metal-catalyzed reactions, such as Suzuki-Miyaura coupling. Specifically, we demonstrate that vinyl boronic ester ate complexes, prepared by combining organoboronates and organolithium reagents, engage in palladium-induced metallate rearrangement wherein 1,2-migration of an alkyl or aryl group from boron to the vinyl α-carbon occurs concomitantly with C-Pd σ-bond formation. This elementary reaction enables a powerful cross-coupling reaction in which a chiral Pd catalyst merges three simple starting materials-an organolithium, an organoboronic ester, and an organotriflate-into chiral organoboronic esters with high enantioselectivity.
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
authors.forename: Gabriel J
authors.initials: GJ
authors.lastname: Lovinger
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
authors.forename: Emma K
authors.initials: EK
authors.lastname: Edelstein
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
authors.forename: Adam A
authors.initials: AA
authors.lastname: Szymaniak
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
authors.forename: Matteo P
authors.initials: MP
authors.lastname: Chierchia
authors.affiliation: Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA. morken@bc.edu.
authors.forename: James P
authors.initials: JP
authors.lastname: Morken
mesh_terms: D001895:Boron / Q000737:chemistry; D001897:Boronic Acids / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic / Q000379:methods*; D008094:Lithium / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*
chemical_list: D001897:Boronic Acids; D009942:Organometallic Compounds; D010165:Palladium; D002244:Carbon; D008094:Lithium; D001895:Boron