title: Fulvene Synthesis by Rhodium(I)-Catalyzed [2+2+1] Cycloaddition: Synthesis and Catalytic Activity of Tunable Cyclopentadienyl Rhodium(III) Complexes with Pendant Amides.
abstract: It has been established that a RhI+/segphos complex catalyzes the [2+2+1] cycloaddition of 1,6-diynes with cyclopropylideneacetamides to give substituted fulvenes in good yields. The reductive complexation of the product fulvenes with RhCl3in EtOH furnished the corresponding dinuclear cyclopentadienyl RhIIIcomplexes bearing a pendant amide moiety. These RhIIIcomplexes were highly active catalysts for oxidative annulation and cyclization through C(sp2)-H and C(sp3)-H functionalization.
authors.affiliation: Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan.
authors.forename: Soichi
authors.initials: S
authors.lastname: Yoshizaki
authors.affiliation: Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan.
authors.forename: Yu
authors.identifier: 0000-0003-1017-0436
authors.initials: Y
authors.lastname: Shibata
authors.affiliation: Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan.
authors.forename: Ken
authors.identifier: 0000-0001-8108-5808
authors.initials: K
authors.lastname: Tanaka
keywords: C−H functionalization; annulation; cyclopentadienyl complexes; fulvenes; rhodium