Mild and Functional Group Tolerant Method for Tandem Palladium-Catalyzed Carbocyclization-Coupling of ε-Acetylenic β-Ketoesters with Aryl Bromides and Chlorides
作者:Wojciech Chaładaj、Sylwester Domański
DOI:10.1002/adsc.201600175
日期:2016.6.2
report a new protocol for the annulative difunctionalization of acetylenes via tandem carbocyclization–coupling of ε‐acetylenic β‐ketoesters with aryl and heteroaryl bromides and chlorides catalyzed by the palladium species derived from an air‐ and moisture‐stable palladacyclic precatalyst. In the tandem process, the palladiumcomplex combines appropriate carbophilic Lewis acidity and redox activity to catalyze
Ni(II)-Catalyzed Conia-Ene Reaction of 1,3-Dicarbonyl Compounds with Alkynes
作者:Qiang Gao、Bao-Fu Zheng、Jin-Heng Li、Dan Yang
DOI:10.1021/ol050532q
日期:2005.5.1
We have discovered a Ni(II)-catalyzed Conia-ene reaction of 1,3-dicarbonyl compounds with alkynes. In the presence of Ni(acac)(2) and Yb(OTf)(3), various acetylenic 1,3-dicarbonyl compounds underwent Conia-ene reaction to give mono- and bicyclic olefinic cyclopentanes. A mechanism involving the enol-yne-Ni complex formation is proposed and supported by deuterium-labeling experiments.
Gold(I)-Catalyzed Conia-Ene Reaction of β-Ketoesters with Alkynes
作者:Joshua J. Kennedy-Smith、Steven T. Staben、F. Dean Toste
DOI:10.1021/ja049487s
日期:2004.4.1
The intramolecular addition of beta-ketoesters to unactivated alkynes under neutral conditions and at room temperature is described. The method employs triphenylphosphinegold(I) cation as a catalyst for the formation of exo-methylenecycloalkanes. Both monocyclic and bicyclic cyclopentanes and cyclohexanes can be formed in excellent yields and with good diastereoselectivity.