title: Rhenium-catalyzed regio- and stereoselective addition of two carbon units to terminal alkynes via carbon-carbon bond cleavage of β-keto sulfones.
abstract: Treatment of β-keto sulfones with terminal alkynes gave unsaturated δ-keto sulfones in good to excellent yields under rhenium catalysis. In this reaction, the insertion of the alkynes into the nonstrained carbon-carbon single bond between the α- and β-positions of the β-keto sulfones proceeded smoothly, and (Z)-isomers were produced with high regio- and stereoselectivities.
authors.affiliation: Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Kita-ku, Okayama, Japan. kuninobu@cc.okayama-u.ac.jp
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Kuninobu
authors.forename: Hironori
authors.initials: H
authors.lastname: Matsuzaki
authors.forename: Mitsumi
authors.initials: M
authors.lastname: Nishi
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Takai