title: Controllable cyclization reactions of 2-(2',3'-allenyl)acetylacetates catalyzed by gold and palladium affording substituted cyclopentene and 4,5-dihydrofuran derivatives with distinct selectivity.
abstract: Efficient room-temperature syntheses of cyclopentenes and 4,5-dihydrofurans with different substitution patterns were performed starting from the same materials (i.e., 2-(2',3'-allenyl)acetylacetates). Depending on the choice of metal catalyst, the Au-catalyzed reaction afforded C-attack-5-endo cyclization products 2, whereas the Pd-catalyzed one led to the formation of O-attack-5-exo cyclization products 3. The selectivity may be explained by the steric and electronic effects of the substrates and catalysts.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai, China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Jiang
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Ma
authors.forename: Zilong
authors.initials: Z
authors.lastname: Zheng
authors.forename: Shengming
authors.initials: S
authors.lastname: Ma