title: Ni(II)-catalyzed Conia-ene reaction of 1,3-dicarbonyl compounds with alkynes.
abstract: [reaction: see text]. We have discovered a Ni(II)-catalyzed Conia-ene reaction of 1,3-dicarbonyl compounds with alkynes. In the presence of Ni(acac)2 and Yb(OTf)3, various acetylenic 1,3-dicarbonyl compounds underwent Conia-ene reaction to give mono- and bicyclic olefinic cyclopentanes. A mechanism involving the enol-yne-Ni complex formation is proposed and supported by deuterium-labeling experiments.
authors.affiliation: Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Bao-Fu
authors.initials: BF
authors.lastname: Zheng
authors.forename: Jin-Heng
authors.initials: JH
authors.lastname: Li
authors.forename: Dan
authors.initials: D
authors.lastname: Yang