Mechanism of the Palladium-Catalyzed Intramolecular Hydroalkylation of 7-Octene-2,4-dione
作者:Hua Qian、Ross A. Widenhoefer
DOI:10.1021/ja0293002
日期:2003.2.1
cis-2-acyl-3,4-dideuteriocyclohexanone (cis-3-3,4-d(2)) in 64% yield as the exclusive isotopomer. This experiment, in conjunction with additional deuterium labeling experiments, was in accord with a mechanism for the conversion of 1 to 3 catalyzed by 2 involving attack of the enol carbon atom on a palladium-complexed olefin followed by palladium migration and protonolysis from a palladium enolate complex
A controlled selective synthesis of dihydropyrans through tandem reaction of alkynes with diazo compounds
作者:Junxiang Min、Guangyang Xu、Jiangtao Sun
DOI:10.1039/c7cc01616f
日期:——
A controlled synthesis of dihydropyrans via sequential reaction of allenoate formation and intramolecular oxo-Michael addition has been achieved.
通过烯尿酸酯形成和分子内氧代-迈克尔加成的顺序反应,实现了对二氢吡喃的受控合成。
Palladium-Catalyzed Carbonylative Cycloisomerization of γ-Propynyl-1,3-diketones: A Concise Route to Polysubstituted Furans
作者:Yu Li、Zhengkun Yu
DOI:10.1021/jo9020634
日期:2009.11.20
trisubstituted furan derivatives have been efficiently synthesized via palladium(II)-catalyzed intramolecular carbonylative cycloisomerization of γ-propynyl-1,3-diketones with aryl iodides and carbonmonoxide. The mechanism suggests that in situ generated acylpalladium species from the carbonylation of aryl iodide initiates the reaction followed by cyclization of the enolized isomer of a 1,3-diketone substrate
Yb(OTf)3-Promoted ZnCl2-Catalyzed Conia-Ene Reaction of Linear β-Alkynic β-Dicarbonyls
作者:Jin-Heng Li、Yu Liu、Ren-Jie Song
DOI:10.1055/s-0030-1258213
日期:2010.11
An atom-economical and solvent-freeytterbium(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 β-alkynic β-keto esters and β-alkynic β-diketones were cyclized under neat conditions in moderate to good yields. It
Copper/Silver-Cocatalyzed Conia-Ene Reaction of Linear β-Alkynic β<i>-</i>Ketoesters
作者:Chen-Liang Deng、Ren-Jie Song、Sheng-Mei Guo、Zhi-Qiang Wang、Jin-Heng Li
DOI:10.1021/ol7023289
日期:2007.11.1
A novel and general copper/silver catalytic system has been developed for the Conia-ene intramolecular reaction of linear beta-alkynic beta-ketoesters. In the presence of (CuOTf)(2)center dot C6H6 and AgSbF6 (or AgOAc), a variety of the linear 6-alkynic 6-ketoesters selectively underwent the Conia-ene intramolecular reaction in moderate to good yields.