title: Rh-catalyzed [5+1] and [4+1] cycloaddition reactions of 1,4-enyne esters with CO: a shortcut to functionalized resorcinols and cyclopentenones.
abstract: We have developed novel Rh-catalyzed [n+1]-type cycloadditions of 1,4-enyne esters, which involve an acyloxy migration as a key step. The efficient preparation of functionalized resorcinols, including biaryl derivatives, from readily available 1,4-enyne esters and CO was achieved by Rh-catalyzed [5+1] cycloaddition accompanied by 1,2-acyloxy migration. When enyne esters had an internal alkyne moiety, the reaction proceeded by a [4+1]-type cycloaddition involving 1,3-acyloxy migration, leading to cyclopentenones.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. fukuyama@c.s.osakafu-u.ac.jp
authors.forename: Takahide
authors.initials: T
authors.lastname: Fukuyama
authors.forename: Yuko
authors.initials: Y
authors.lastname: Ohta
authors.forename: Célia
authors.initials: C
authors.lastname: Brancour
authors.forename: Kazusa
authors.initials: K
authors.lastname: Miyagawa
authors.forename: Ilhyong
authors.initials: I
authors.lastname: Ryu
authors.forename: Anne-Lise
authors.initials: AL
authors.lastname: Dhimane
authors.forename: Louis
authors.initials: L
authors.lastname: Fensterbank
authors.forename: Max
authors.initials: M
authors.lastname: Malacria