开发了一种方便的方法,可使用酸和碱支持的试剂系统'Na 2 CO 3 / Al 2 O 3 -PPA / SiO 2 '从β-酮酯和α-卤代酮一锅合成呋喃。PPA / SiO 2促进了β-酮酸酯与α-卤代酮在Na 2 CO 3 / Al 2 O 3存在下的反应而形成的三酮缩合反应,得到了相应的呋喃。产量。与分步法相比,该方法简单易行,收率好。 呋喃-一锅合成-支持的试剂
Auto-Tandem Catalysis-Induced Synthesis of Trisubstituted Furans through Domino Acid-Acid-Catalyzed Reaction of Aliphatic Aldehydes and 1,3-Dicarbonyl Compounds by using<i>N</i>-Bromosuccinimide as Oxidant
作者:Wenbo Huang、Changhui Liu、Yanlong Gu
DOI:10.1002/adsc.201700074
日期:2017.6.6
A simple aluminium(III) chloride‐catalyzed synthesis of tri‐substitutedfurans from aliphatic aldehydes and 1,3‐dicarbonyl compounds was developed by using N‐bromosuccinimide (NBS) as an oxidant. This method was effective for the synthesis of various furan derivatives. Some of the products were not accessible with the previously reported methods. Mechanically, this reaction involved an auto‐tandem
Chemoselective cyclizations of 1,3-dicarbonyl compounds with hydroxyketones for the selective formation of two 2,3,5-trisubstituted furans have been reported. While TsOH-mediated cyclization in DCM afforded 2-acylfurans, the additional copper catalyst in acetone turned over the selectivity for the generation of 3-acylfurans. The featured advantages of both reactions include simple conditions, high
convenient method for the one-pot synthesis of furans from β-keto esters and α-halo ketones was developed using an acid- and base-supported reagent system ‘Na2CO3/Al2O3-PPA/SiO2’. The condensation reaction of triketones, which are formed from the reaction of β-keto esters with α-halo ketones in the presence of Na2CO3/Al2O3, was promoted by PPA/SiO2 to give the corresponding furans in good yields. This method
开发了一种方便的方法,可使用酸和碱支持的试剂系统'Na 2 CO 3 / Al 2 O 3 -PPA / SiO 2 '从β-酮酯和α-卤代酮一锅合成呋喃。PPA / SiO 2促进了β-酮酸酯与α-卤代酮在Na 2 CO 3 / Al 2 O 3存在下的反应而形成的三酮缩合反应,得到了相应的呋喃。产量。与分步法相比,该方法简单易行,收率好。 呋喃-一锅合成-支持的试剂