Higly efficienthydroarylation and hydroalkylation of styrenes with various arenes and 1,3-dicarbonyl compounds respectively have been developed using Amberlyst-15 as a heterogeneous catalyst. The ...
Metal Triflate-Catalyzed Cationic Benzylation and Allylation of 1,3-Dicarbonyl Compounds
作者:Masahiro Noji、Yosuke Konno、Keitaro Ishii
DOI:10.1021/jo0705216
日期:2007.7.1
The rare earth metal and hafnium triflate-catalyzed secondary benzylation and allylation of 1,3-diketones, ketoesters, and ketoamides are described. The procedure was carried out under non-anhydrous conditions. Various 1-phenylethyl cations were generated from substituted 1-phenylethanols using 0.5 mol % of the metal triflates in CH3NO2. The cations reacted with 1,3-diketones and ketoesters to give
描述了稀土金属和三氟甲磺酸ha催化的1,3-二酮,酮酸酯和酮酰胺的二次苄基化和烯丙基化。该程序在无水条件下进行。在CH 3 NO 2中使用0.5摩尔%的金属三氟甲磺酸酯,由取代的1-苯基乙醇生成各种1-苯基乙基阳离子。。阳离子与1,3-二酮和酮酸酯反应生成苄基化产物,收率很高。根据GC分析,可根据三氟甲磺酸的路易斯酸度和反应温度通过选择催化剂轻松优化反应条件。叔烷基化的二酮和相应的酮酸酯也被苄基化,以57-84%的收率得到具有季碳原子的产物。与二酮和酮酯反应中使用的那些相比,酮酰胺反应需要更强的路易斯酸。在Hf(OTf)4的存在下,研究了在芳环上具有各种取代基的苄醇与作为二酮的二苯甲酰甲烷(2b)的反应。富电子苄醇与2b反应以86-96%的产率收率,缺电子醇则以79-65%的收率得到所需的产物。尽管具有强的吸电子基团,但是1-(4-硝基苯基)乙醇的反应以61%的收率得到了相应的产物。也可以
Amberlyst-15® in ionic liquid: an efficient and recyclable reagent for the benzylation and hydroalkylation of β-dicarbonyl compounds
作者:Ziyauddin S. Qureshi、Krishna M. Deshmukh、Pawan J. Tambade、Bhalchandra M. Bhanage
DOI:10.1016/j.tetlet.2009.11.122
日期:2010.1
Benzylation and hydroalkylation of 1,3-dicarbonylcompounds using Amberlyst-15 immobilized in ionic liquid [Bmim][PF6] as an efficient reusable reagent was studied. The reagent was compared with other solid acid reagents along with role of the ionic liquid. The effect of various reaction parameters like type of reagent, solvent, substrate molar ratio, reaction time, and temperature were studied. Present
The Lewis Acidic Ruthenium-Complex-Catalyzed Addition of β-Diketones to Alcohols and Styrenes Is in Fact Brønsted Acid Catalyzed
作者:Pei Nian Liu、Zhong Yuan Zhou、Chak Po Lau
DOI:10.1002/chem.200700705
日期:2007.10.15
toward 1-phenylethanol in the presence of HClO4; it also fails to catalyze the addition of acetylacetone to 1-phenylethanol. On the basis of these observations, it is proposed and confirmed by independent experiments that the catalytic addition of beta-diketones to the secondary alcohols is in fact catalyzed by the Bronsted acid HClO4, which is generated by the reaction of cis-[Ru(6,6'-Cl2bipy)2(H2O)2](ClO4)2
Copper-Catalyzed Oxidative Coupling of Benzylic C−H Bonds with 1,3-Dicarbonyl Compounds
作者:Nadine Borduas、David A. Powell
DOI:10.1021/jo801322p
日期:2008.10.3
A copper-catalyzedoxidativecoupling of benzylic C-H bonds with 1,3-dicarbonyl compounds is described. The reaction utilizes an inexpensive copper catalyst-oxidant system that is suitable for the coupling of a range of benzylic C-H bonds with various 1,3-dicarbonyl compounds. Kinetic isotope studies support a mechanism involving a benzylic hydrogen abstraction.