title: Phosphine- and nitrogen-containing Lewis base catalyzed highly regioselective and geometric selective cyclization of isatin derived electron-deficient alkenes with ethyl 2,3-butadienoate.
abstract: An interesting phosphine-containing Lewis base catalyzed highly regioselective [3 + 2] cycloaddition and a novel nitrogen-containing Lewis base catalyzed highly geometric selective [4 + 2] cycloaddition of isatin derived α,β-unsaturated diesters with α-allenic ester have been disclosed to give the corresponding cyclic products in good to excellent yields under mild conditions. A plausible reaction mechanism has also been proposed on the basis of previous literature and our own investigation.
authors.affiliation: Key Laboratory for Advanced Materials, East China University of Science and Technology, Shanghai, China.
authors.forename: Xiu-Chun
authors.initials: XC
authors.lastname: Zhang
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Cao
authors.forename: Yin
authors.initials: Y
authors.lastname: Wei
authors.forename: Min
authors.initials: M
authors.lastname: Shi