title: Nickel-catalyzed enantioselective three-component coupling of bis-1,3-dienes, aldehydes, and dimethylzinc.
abstract: Nickel-catalyzed three-component coupling of bis-1,3-dienes, aldehyde, and dimethylzinc was investigated. In the presence of catalytic amounts of Ni(acac)2 and PPh3, bis-1,3-dienes smoothly react with an aldehyde and dimethylzinc via intramolecular cyclodimerization of bis-1,3-diene moiety. The reaction proceeds through formation of a cyclic bis-allylnickel complex, insertion of an aldehyde, and addition of dimethylzinc to the resulting oxanickellacycle intermediate. An enantioselective coupling was also achieved by the use of a chiral monodentate phosphine ligand, H-MOP.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido 060-0812, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Takimoto
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Kajima
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Sato
authors.forename: Miwako
authors.initials: M
authors.lastname: Mori
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D008697:Methane / Q000737:chemistry*; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D013237:Stereoisomerism; D015032:Zinc / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D000475:Alkenes; D009942:Organometallic Compounds; D009532:Nickel; C511262:dimethylzinc; D015032:Zinc; D008697:Methane