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
Copper-Catalyzed Coupling of 2-Siloxy-1-alkenes and Diazocarbonyl Compounds: Approach to Multisubstituted Furans, Pyrroles, and Thiophenes
作者:Wei Wen Tan、Naohiko Yoshikai
DOI:10.1021/acs.joc.6b00904
日期:2016.7.1
We report herein copper(II)-catalyzed cyclization reactions of silylenolethersderivedfrom methyl ketones with α-diazo-β-ketoesters or α-diazoketones to afford 2-siloxy-2,3-dihydrofuran derivatives or 2,3,5-trisubstituted furans, respectively, under mild conditions. The former cyclization products serve as versatile 1,4-diketone surrogates, allowing facile preparation of 2,3,5-trisubstituted furans