title: Rh(I)-catalyzed intramolecular [2 + 2 + 1] cycloaddition of allenenes: Construction of bicyclo[4.3.0]nonenones with an angular methyl group and tricyclo[6.4.0.0]dodecenone.
abstract: The [RhCl(CO)dppp](2)-catalyzed intramolecular carbonylative [2 + 2 + 1] cycloaddition of allenenes was developed to prepare bicyclo[4.3.0]nonenones possessing a methyl group at the ring junction, which is difficult to achieve by the Pauson-Khand reaction of the corresponding enynes. This method also provided a new procedure for the construction of the tricyclo[6.4.0.0(1,5)]dodecenone framework in a satisfactory yield.
authors.affiliation: Division of Pharmaceutical Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
authors.forename: Fuyuhiko
authors.initials: F
authors.lastname: Inagaki
authors.forename: Naoya
authors.initials: N
authors.lastname: Itoh
authors.forename: Yujiro
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Yumi
authors.initials: Y
authors.lastname: Matsui
authors.forename: Chisato
authors.initials: C
authors.lastname: Mukai