title: TfOH-catalyzed intramolecular alkyne-ketone metathesis leading to highly substituted five-membered cyclic enones.
abstract: The intramolecular carbocyclization of tethered alkynyl ketones to five-membered cyclic enones is shown to be catalyzed by trifluoromethanesulfonic acid in MeOH, proceeding in good to excellent yields and with high selectivities.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8548, Japan. tjin@mail.tains.tohoku.ac.jp
authors.forename: Tienan
authors.initials: T
authors.lastname: Jin
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Chunli
authors.initials: C
authors.lastname: Liu
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Yamamoto