Pd-catalyzed intramolecular addition of active methylene compounds to alkynes, followed by subsequent cross-coupling with (hetero)aryl bromides and chlorides. The reaction proceeds under mild conditions, providing excellent functional group tolerance, including unprotected OH, NH2 groups, enolizable ketones, or a variety of heterocycles. Mechanistic studies point towards a catalyticcycle involving oxidative
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.
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。
An Efficient and General Microwave-Assisted Copper-Catalyzed Conia-Ene Reaction of Terminal and Internal Alkynes Tethered to a Wide Variety of Carbonucleophiles
作者:Sonia Montel、Didier Bouyssi、Geneviève Balme
DOI:10.1002/adsc.201000351
日期:2010.9.10
This paper describes a highly efficient, microwave‐assisted, Conia‐ene reaction of alkynes bearing a stabilizing carbon nucleophile. The reaction, catalyzed by a commercially available copper catalyst, proceeds under neutral conditions and is generally applicable even to less reactive nucleophiles such as malonate, cyanoacetate, and sulfonylacetate derivatives. This copper‐mediated cycloisomerization
N′-disubstituted cyclic thioureas as ligands for gold(I) catalysis. X-ray crystal structures of the thiourea-gold(I) complexes presented important information about the nature of the complexation. These complexes were found to be active catalysts for the cyclization of 1,3-dicarbonylcompounds with alkynes (Conia-ene reaction). Various acetylenic 1,3-dicarbonylcompounds underwent cycloisomerization to give mono-