title: Platinum-catalyzed intramolecular vinylchalcogenation of alkynes with beta-phenylchalcogeno conjugated amides.
abstract: Platinum-catalyzed intramolecular vinylthiolation and -selenation of internal alkynes with vinylchalcogenides 1 having a carbamoyl group on cis-beta-position of vinyl moiety was developed. The conjugated six-membered lactam framework 2 was constructed in high yields. Density functional theory calculations for alkyne insertion processes suggest seven-membered platinacycle 3 is a kinetically favored intermediate of this catalytic system.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Toyofuku
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Fujiwara
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Shin-ike
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kuniyasu
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Kambe