title: Cyclization reaction of cyano-substituted unsaturated esters prompted by conjugate addition of organoborons.
abstract: [reaction: see text] Unsaturated esters possessing a pendent cyano moiety react with B-Ar-9-BBNs in the presence of a rhodium(I) catalyst to give the five- and six-membered beta-enamino esters in good yield. An (oxa-pi-allyl)rhodium(I) intermediate, formed by initial conjugate addition of an Ar-rhodium(I) species, undergoes a facile intramolecular addition to the cyano group to construct the carbocyclic skeletons.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Miura
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Harumashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Murakami