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
Perchloric Acid Catalyzed Homogeneous and Heterogeneous Addition of β-Dicarbonyl Compounds to Alcohols and Alkenes and Investigation of the Mechanism
作者:Pei Nian Liu、Li Dang、Qing Wei Wang、Shu Lei Zhao、Fei Xia、Yu Jie Ren、Xue Qing Gong、Jun Qin Chen
DOI:10.1021/jo100517k
日期:2010.8.6
The direct addition of various β-dicarbonylcompounds to a series of secondary alcohols and alkenes has been achieved using 1 mol % perchloric acid (HClO4) as the catalyst. The HClO4-catalyzed reactions could be conveniently conducted in commercial solvent and gave moderate to excellent yields. Moreover, the silica gel-supported HClO4 could also catalyze the heterogeneous addition for a series of substrates
Sulfuric acid catalyzed addition of β-dicarbonyl compounds to alcohols under conventional heating and microwave-assisted conditions
作者:Fei Xia、Zheng Le Zhao、Pei Nian Liu
DOI:10.1016/j.tetlet.2012.03.104
日期:2012.6
The highlyefficient direct addition of β-dicarbonylcompounds to secondaryalcohols has been achieved using one of the cheapest acids, H2SO4, as the catalyst. For a series of β-dicarbonylcompounds and various secondaryalcohols, the addition reactions all complete in 5 min with high yields both under the conventional heating condition and under the microwave heating condition. The comparison of the
使用最便宜的酸之一H 2 SO 4作为催化剂,已经实现了将β-二羰基化合物高效直接加成到仲醇中。对于一系列β-二羰基化合物和各种仲醇,在常规加热条件下和微波加热条件下,加成反应均在5分钟内完成,且收率很高。从微波加热条件获得的结果与从常规加热条件获得的结果的比较表明,在微波辅助的加成反应中不存在明显的特定或非热微波效应。
Base-free benzylation of 1,3-dicarbonyl compounds using sulfamic acid supported on silica by linker: a combined experimental and theoretical approach
AbstractSulfamic acid stabilized on the surface of silica by the n-propyl organic group linker which is named silica-bonded N-propylsulfamic acid was applied as an efficient heterogeneous catalyst with good recyclability and reusability for direct benzylation of 1,3-dicarbonyl compoundsusingsecondary aromatic alcohols or styrenes as alkylating agents in high yields and short reaction times. All the