title: Unusual Formal [1+4] Annulation through Tandem P(NMe2 )3 -Mediated Cyclopropanation/Base-Catalyzed Cyclopropane Rearrangement: Facile Syntheses of Cyclopentenimines and Cyclopentenones.
abstract: An unusual formal [1+4] annulation of α-dicarbonyl compounds with 1,1-dicyano-1,3-dienes has been realized, leading to facile syntheses of cyclopentenimines and cyclopentenones in a unique manner. Mechanistic investigation implies that this reaction takes place through a P(NMe2 )3 -mediated cyclopropanation followed by a base-catalyzed cyclopropane rearrangement. It therefore represents an unprecedented [1+4] annulation mode involving Kukhtin-Ramirez adducts.
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, P. R. China. zhourong@tyut.edu.cn.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhou
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, P. R. China.
authors.forename: Ling
authors.initials: L
authors.lastname: Han
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, P. R. China.
authors.forename: Yusong
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, P. R. China.
authors.forename: Ruifeng
authors.initials: R
authors.lastname: Li
authors.affiliation: The State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China.
authors.forename: Zhengjie
authors.initials: Z
authors.lastname: He
keywords: annulation; cyclopentenes; cyclopropanation; dipoles; rearrangement