Three-step synthesis of an array of substituted benzofurans using polymer-supported reagents
作者:Jörg Habermann、Steven V. Ley、René Smits
DOI:10.1039/a904384e
日期:——
achieved by the bromination of acetophenones to α-bromoacetophenones by polymer-supported pyridiniumbromideperbromide (PSPBP). The subsequent clean substitution of the obtained bromides by phenols using 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD-P) and cyclodehydration of the resulting α-phenoxyacetophenones using Amberlyst 15, affords pure products without the need for any chromatographic purification
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
Facile synthesis of regio-isomeric naphthofurans and benzodifurans
作者:Kwanghee Koh Park、Jinsuk Jeong
DOI:10.1016/j.tet.2004.11.022
日期:2005.1
Naphtho[1,2-b]furans 1a–f, naphtho[2,1-b]furans 2a–f, benzo[1,2-b:5,4-b′]difurans 3a–b, benzo[1,2-b:4,5-b′]difurans 4a–b, and benzo[1,2-b:4,3-b′]difurans 5a–b were synthesized by base-catalyzed cyclization reaction of the corresponding o-alkoxybenzoylarene derivatives. The o-alkoxybenzoylarenes were obtained from the etherification reaction of the o-hydroxybenzoylarenes, which were prepared either
萘并[1,2- b ]呋喃1a - f,萘并[2,1- b ]呋喃2a - f,苯并[1,2- b:5,4- b ']双呋喃3a - b,苯并[1,通过相应的邻烷氧基苯并芳基芳烃的碱催化环化反应合成了2- b:4,5- b ']二呋喃4a - b和苯并[1,2- b:4,3- b ']二呋喃5a - b衍生品。该Øα-烷氧基苯甲酰基芳烃是由邻羟基苯甲酰基芳烃的醚化反应制得的,该反应是通过在氯化铝存在下甲氧基芳烃与苯甲酰氯的反应或通过芳基苯甲酸酯的光-弗里斯重排而制备的。
Novel One-Pot Synthesis of 3-Phenylnaphtho[2,3-b]furan and 3-Phenylbenzofurans Under Microwave Irradiation and Solvent-Free Conditions
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