title: Rhodium-catalyzed cyclopropanation using ene-yne-imino ether compounds as precursors of (2-pyrrolyl)carbenoids.
abstract: [reaction: see text] The reaction of alkenes with conjugated ene-yne-imino ether or ene-yne-aldimine in the presence of a catalytic amount of [Rh(OAc)(2)](2) gives (2-pyrrolyl)cyclopropanes in good yields. The key intermediate of this cyclopropanation is a (2-pyrrolyl)carbenoid generated by the nucleophilic attack of imine nitrogen atom at an internal alkyne carbon activated by rhodium complex. The intramolecular reaction also proceeds to afford a polycyclic pyrrole.
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Nishino
authors.forename: Koji
authors.initials: K
authors.lastname: Miki
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Kato
authors.forename: Kouichi
authors.initials: K
authors.lastname: Ohe
authors.forename: Sakae
authors.initials: S
authors.lastname: Uemura