title: An opened route to 1,3-dimethylenecyclobutanes via sequential ruthenium-catalyzed [2 + 2] cycloaddition of allenyl boronate and palladium Suzuki coupling.
abstract: The regioselective head-to-head [2 + 2] cyclodimerization of allenyl boronate catalyzed by the ruthenium catalyst [Cp*RuCl(COD)] leads to a novel diboronated 1,3-dimethylenecyclobutane. Consecutive palladium-catalyzed C-C couplings open a route to novel disubstituted 1,3-dimethylenecyclobutane species. The X-ray crystalline structure of the phenyl-substituted 1,3-dimethylenecyclobutane is provided.
authors.affiliation: Institut de Chimie de Rennes, UMR 6509 Université de Rennes 1--CNRS, Organométalliques et Catalyse, Campus de Beaulieu, 35042 Rennes, France.
authors.forename: Emilio
authors.initials: E
authors.lastname: Bustelo
authors.forename: Carine
authors.initials: C
authors.lastname: Guérot
authors.forename: Alain
authors.initials: A
authors.lastname: Hercouet
authors.forename: Bertrand
authors.initials: B
authors.lastname: Carboni
authors.forename: Loïc
authors.initials: L
authors.lastname: Toupet
authors.forename: Pierre H
authors.initials: PH
authors.lastname: Dixneuf
mesh_terms: D001896:Boron Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D018360:Crystallography, X-Ray; D003500:Cyclization; D003503:Cyclobutanes / Q000138:chemical synthesis*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D001896:Boron Compounds; D003503:Cyclobutanes; D009942:Organometallic Compounds; D010165:Palladium; D012428:Ruthenium