title: Rhodium-catalyzed oxidative coupling between salicylaldehydes and internal alkynes with C-H bond cleavage to produce 2,3-disubstituted chromones.
abstract: A direct oxidative coupling of salicylaldehydes with internal alkynes proceeds efficiently with cleavage of the aldehyde C--H bond to produce the corresponding chromone derivatives. A rhodium catalyst in combination with a cyclopentadiene ligand and a copper oxidant promote this straightforward annulation reaction. Solid-state luminescence was observed for certain chromone products.
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Shimizu
authors.forename: Hayato
authors.initials: H
authors.lastname: Tsurugi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Satoh
authors.forename: Masahiro
authors.initials: M
authors.lastname: Miura