Yb(OTf)(3)-Promoted ZnCl2-Catalyzed Conia-Ene Reaction of Linear beta-Alkynic beta-Dicarbonyls

[摘要]：An atom-economical and solvent-free ytterbium(III) triflate promoted, zinc(II) chloride catalyzed Conia-ene method has been developed for the construction of five-to six-membered-ring carbocycles. In the presence of zinc(II) chloride and ytterbium(III) triflate, a variety of linear beta-alkynic beta-keto esters and beta-alkynic beta-diketones were cyclized under neat conditions in moderate to good yields. It is noteworthy that the selectivity toward five- or six-membered-ring carbocycles depends on substituents at the terminal alkynes.

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