title: Phosphine-catalyzed cascade [3 + 2] cyclization-allylic alkylation, [2 + 2 + 1] annulation, and [3 + 2] cyclization reactions between allylic carbonates and enones.
abstract: The phosphine-catalyzed annulations between Morita-Baylis-Hillman adduct carbonates and enones are reported. Under the catalysis of PBu(3) (20 mol %), cascade [3 + 2] cyclization-allylic alkylation, [2 + 2 + 1] annulation, and [3 + 2] cyclization reactions chemoselectively occur depending on the substituent variation of both the carbonate and enone. These reactions provide efficient syntheses of highly functionalized cyclopentenes and cyclopentanes.
authors.affiliation: The State Key Laboratory of Elemento-Organic Chemistry and Department of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, P.R. China.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhou
authors.forename: Jianfang
authors.initials: J
authors.lastname: Wang
authors.forename: Haibin
authors.initials: H
authors.lastname: Song
authors.forename: Zhengjie
authors.initials: Z
authors.lastname: He