Abstract
Difluoromethylation of 2-hydroxychalcones using sodium 2-chloro-2,2-difluoroacetate as the difluoromethylating agent was developed. Under facile conditions, a wide range of aryl difluoromethyl ethers were obtained in yields of 36%–80%. It is noteworthy that the new addition products, 2,2-difluoro-2H-benzofuran derivatives, were also synthesized in the reactions. The yield of 2,2-difluoro-2H-benzofuran derivative could be up to 35% when 3-methyl-2-hydroxychalcone was used as the reactant. A plausible reaction mechanism was proposed.
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Supported by the National Natural Science Foundation of China(Nos.21302071, 21261008, 21204031), the Natural Science Foundation of Jiangsu Province, China(No.BK20130484), the Scientific Research Foundation for Advanced Talents of Jiangsu University, China(No.12JDG089/14JDG054) and the Hainan International Science and Technology Cooperation, China (No.KJHZ2014-05).
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Wang, W., Hua, M., Huang, Y. et al. Difluoromethylation of 2-hydroxychalcones using sodium 2-chloro-2,2-difluoroacetate as difluoromethylating agent. Chem. Res. Chin. Univ. 31, 362–366 (2015). https://doi.org/10.1007/s40242-015-4456-0
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DOI: https://doi.org/10.1007/s40242-015-4456-0