General Zinc-Catalyzed Conia-Ene Reactions of 1,3-Dicarbonyl Compounds with Alkynes Including the Classically Challenging Substrates under Neat Conditions
作者:Chen-Liang Deng、Ren-Jie Song、Yi-Lin Liu、Jin-Heng Li
DOI:10.1002/adsc.200900588
日期:2009.12
products has been developed by zinc-catalyzed intramolecular Conia-enereactions of 1,3-dicarbonylcompounds with alkynes. This new route allows a wide range of dicarbonyl compounds, including the classicallychallenging 1,3-diesters and N,N′-disubstituted 1,3-keto amides, to be used for the Conia-enereaction with inexpensive zinc chloride (ZnCl2) underneatconditions.
Boronic acid catalyzed ene carbocyclization of acetylenic dicarbonyl compounds
作者:Meiling Li、Ting Yang、Darren J. Dixon
DOI:10.1039/b924899d
日期:——
The discovery and development of an efficient ene carbocyclization of 1,3-dicarbonyl compounds bearing pendent terminal alkyne substituents under 3-nitrobenzeneboronic acid catalysis is described. The reaction is efficient, easy to perform and general to a wide range of ketoester substrates.
Mechanistic Investigations into the Enantioselective Conia-Ene Reaction Catalyzed by Cinchona-Derived Amino Urea Pre-Catalysts and Cu<sup>I</sup>
作者:Filippo Sladojevich、Ángel L. Fuentes de Arriba、Irene Ortín、Ting Yang、Alessandro Ferrali、Robert S. Paton、Darren J. Dixon
DOI:10.1002/chem.201200832
日期:2013.10.11
Conia‐ene cyclization of alkyne‐tethered β‐ketoesters is efficiently catalyzed by the combination of cinchona‐derived amino‐urea pre‐catalysts and copper(I) salts. The reaction scope is broad and a series of substrates can be efficiently cyclized with high yields and enantioselectivities. Herein, we present a detailed mechanistic study based on experimental considerations and quantum mechanical calculations
The development of a novel cooperative catalytic system for an amine–silver co-catalyzed Conia-ene reaction of alkyne-tethered C–H-acidic compounds is reported.
Copper/Silver-Cocatalyzed Conia−Ene Reactions of 2-Alkynic 1,3-Dicarbonyl Compounds
作者:Chen-Liang Deng、Tao Zou、Zhi-Qiang Wang、Ren-Jie Song、Jin-Heng Li
DOI:10.1021/jo802133w
日期:2009.1.2
A copper/silver-catalyzed Conia−enereaction has been developed for selectively constructing five-membered and six-membered rings. In the presence of (CuOTf)2·C6H6 and AgBF4, a variety of 2-alkynic 1,3-dicarbonylcompounds underwent the Conia−ene intramolecular reaction smoothly in moderate to good yields. It is noteworthy that both 2-phenylacetylhept-6-ynenitrile and diethyl 2-(pent-4-ynyl)malonate
已经开发出铜/银催化的Conia-ene反应,用于选择性地构建五元环和六元环。在(CuOTf)2 ·C 6 H 6和AgBF 4的存在下,各种2-炔基1,3-二羰基化合物顺利进行了Conia-ene分子内反应,产率中等至良好。值得注意的是,在标准条件下,2-苯基乙酰庚基-6腈和2-(戊-4-炔基)丙二酸二乙酯也是合适的底物,对内-或外-产物的选择性取决于末端的取代基。炔烃。