title: Rhodium-catalyzed enantio- and diastereoselective intramolecular [2 + 2 + 2] cycloaddition of unsymmetrical dienynes.
abstract: A cationic rhodium(i)/(R)-H(8)-BINAP or (R)-Segphos complex catalyzes an intramolecular [2 + 2 + 2] cycloaddition of unsymmetrical dienynes, leading to fused tri- and tetracyclic cyclohexenes bearing two tertiary or quaternary carbon centers in high yields with high enantio- and diastereoselectivity.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Sagae
authors.forename: Keiichi
authors.initials: K
authors.lastname: Noguchi
authors.forename: Masao
authors.initials: M
authors.lastname: Hirano
authors.forename: Ken
authors.initials: K
authors.lastname: Tanaka