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 ...
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。
Triflic acid adsorbed on silica gel as an efficient and recyclable catalyst for the addition of β-dicarbonyl compounds to alcohols and alkenes
作者:Pei Nian Liu、Fei Xia、Qing Wei Wang、Yu Jie Ren、Jun Qin Chen
DOI:10.1039/b926142g
日期:——
The silicagel supported triflic acid was readily prepared via simple absorption of TfOH onto chromatographic silicagel. This solid acid was applied as an efficient catalyst for the heterogeneous addition of various β-dicarbonyl compounds to a series of alcohols and alkenes, which afforded moderate to excellent yields under solvent-free conditions or in nitromethane. Moreover, this silicagel supported
Alkylation of 1,3-dicarbonyl compounds with benzylic and propargylic alcohols using Ir–Sn bimetallic catalyst: synthesis of fully decorated furans and pyrroles
作者:Paresh Nath Chatterjee、Sujit Roy
DOI:10.1016/j.tet.2011.04.092
日期:2011.6
The heterobimetallic complex [Ir(COD)(SnCl3)Cl(μ-Cl)]2 catalyzes the direct substitution of hydroxyl groups in benzylic and propargylicalcohols by 1,3-dicarbonyl moiety. In 4-hydroxycoumarin, benzylation and propargylation occurs at the 3-position. Selective propargylation or allenylation takes place depending on the nature of propargylicalcohol. By applying the methodology, multi-substituted furans
The vinyl arenes undergo smooth hydroalkylation with 1,3-diketones in the presence of 10 mol% of iodine to afford phenethyl diketones and ketoesters in good yields in short reaction times. The use of inexpensive and readily available molecular iodine makes this method quite simple, more convenient and practical. (C) 2010 Elsevier Ltd. All rights reserved.