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
Base-Mediated Tandem Reaction of α-Aryloxyacetophenones with Phosphonates: Selective Synthesis of Enol Phosphates
作者:Ye-Xiang Xie、Jin-Heng Li、Ren-Jie Song、Yan-Yun Liu、Ji-Cheng Wu、Guo-Bo Deng、Xu-Heng Yang、Yu Liu
DOI:10.1055/s-0031-1289717
日期:2012.4
A new, simple method for the synthesis of enol phosphates by base-mediated tandem reaction of α-aryloxyacetophenones with phosphonates is described. In the presence of Cs2CO3, a variety of α-aryloxyacetophenones smoothly underwent the sequential O-P bond-forming/C-O bond cleavage/isomerization tandem reaction with phosphonates at room temperature, providing the corresponding enol phosphates in moderate to excellent yields.
Base-Mediated Synthesis of 1-Aryl-4-(phenylsulfonyl)butan-1-ones from 1,2-Bis(phenylsulfonyl)ethane and Ketones
作者:Ren-Jie Song、Jian-Nan Xiang、Jin-Heng Li、Ye-Xiang Xie、Yu Liu、Zhi-Qiang Wang
DOI:10.1055/s-0033-1338557
日期:——
Abstract A new, simple, base-mediated addition reaction of 1,2-bis(phenylsulfonyl)ethane to ketones has been developed for the synthesis of 1-aryl-4-(phenylsulfonyl)butan-1-ones. This method represents the first example of preparing sulfones using 1,2-bis(phenylsulfonyl)ethane as the sulfone resource. A new, simple, base-mediated addition reaction of 1,2-bis(phenylsulfonyl)ethane to ketones has been
Abstract A new, practical, base-mediated method has been developed for the synthesis of 2,4-bis(aryloxy)-1,5-diarylpentane-1,5-diones by a tandem α-methylenation–Michael reaction through activation of two C–Cl bonds. This method permits the use of dichloromethane instead of dibromomethane as a source of one carbon atom for the α-methylenation reaction. The products are useful in syntheses of polysubstituted