Palladium-Catalyzed α-Arylation of Aryloxyketones for the Synthesis of 2,3-Disubstituted Benzofurans
作者:Jin Ho Lee、Myungock Kim、Ikyon Kim
DOI:10.1021/jo500885w
日期:2014.7.3
A highly efficient palladium-catalyzed α-arylation of aryloxyketones has been developed, allowing for facile installation of various (hetero)aryl groups at C2 position in good to excellent yields. Subsequent cyclodehydration of the resulting α-arylated aryloxyketones provided rapid access to diverse 2,3-disubstitured benzofurans.
Abstract A one-pot synthesis of functionalized benzofurans has been developed via O-alkylation, carbon–carbon coupling/cyclization, and dehydration/olefination tandem reactions from phenacyl bromide and phenols undermicrowaveirradiation and solvent-freeconditions in the presence of mineral-supported reagent and inorganic base. The best selectivity for forming benzofuran product has been achieved
A convenient process for the synthesis of 3-arylbenzofurans and their derivatives by 2-phenoxy-1-phenylethanones via TfOH-SiO2 catalyzed is developed. This method provides several advantages such as simple work-up procedure, simple post-treatment process, high yields, broad applicability, practicability, and recycling of the catalyst.
Synthesis of benzofurans from the cyclodehydration of α-phenoxy ketones mediated by Eaton’s reagent
作者:Zhanwei Ma、Min Zhou、Lin Ma、Min Zhang
DOI:10.1177/1747519820907244
日期:2020.7
acid) is used to prepare 3-substituted or 2,3-disubstituted benzofurans with moderate to excellent yields under mild conditions. The method provides a facile access to benzofurans from readily available starting materials such as phenols and α-bromo ketones. The reaction is highly efficient, which is attributed to the good reactivity and fluidity of Eaton’s reagent. The reaction can be applied to prepare
A series of new polyetherketones was prepared by Rh-catalyzed polycondensation of bis(diazocarbonyl) compounds 1a−c with aromatic diols 2A−C in cyclic ethers (THF, THP, and 1,4-dioxane). In addition to the expected insertion of diazo-bearing carbon of 1a−c into O−H of 2A−C releasing N2, unexpected incorporation of the ring-opened cyclic ethers between the diazo-bearing carbon of 1a−c and phenolic oxygen