The oxidative C-H aryloxydifluoromethylation and arylthiodifluoromethylation of heteroaromatic compounds through the decarboxylation of easily accessible aryloxydifluoroacetic acids and arylthiodifluoroacetic acids, respectively, are disclosed. These reactions are promoted by the combination of catalytic AgNO3 and Selectfluor or K2S2O8 to give ArOCF2- and ArSCF2-substituted heteroaromatic compounds in moderate to high yields.
Radical coupling of arylthiodifluoroacetic acids and ethynylbenziodoxolone (EBX) reagents to access arylthiodifluoromethylated alkynes
A practical and efficient radical coupling of easily available arylthiodifluoroacetic acids and ethynylbenziodoxolone (EBX) reagents has been reported. Under transition metal-free conditions, aryl-substituted EBXs were converted to the corresponding ArSCF2-substituted alkynes in moderate to good yields, whereas TIPS-EBX underwent silver-catalyzed decarboxylative conditions to deliver the desired coupling
<i>O</i>-Trifluoromethylation of Phenols: Access to Aryl Trifluoromethyl Ethers by <i>O</i>-Carboxydifluoromethylation and Decarboxylative Fluorination
作者:Min Zhou、Chuanfa Ni、Zhengbiao He、Jinbo Hu
DOI:10.1021/acs.orglett.6b01779
日期:2016.8.5
A new strategy for the synthesis of aryl trifluoromethyl ethers (ArOCF3) by combining O-carboxydifluoromethylation of phenols and subsequent decarboxylativefluorination is reported. This protocol allows easy construction of functionalized trifluoromethoxybenzenes and trifluoromethylthiolated arenes (ArSCF3) in moderate to good yields. Moreover, it utilizes accessible and inexpensive reagents sodium