Regioselective C–H Trifluoromethylation of Aromatic Compounds by Inclusion in Cyclodextrins
作者:Xu Lu、Ryohei Kawazu、Jizhou Song、Yusuke Yoshigoe、Takeru Torigoe、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.1c01259
日期:2021.6.4
A regioselective radical C–H trifluoromethylation of aromatic compounds was developed using cyclodextrins (CDs) as additives. The C–H trifluoromethylation proceeded with high regioselectivity to afford the product in good yield, even on the gram scale. In the presence of CDs, some substrates underwent a single trifluoromethylation selectively, whereas mixtures of single- and double-trifluoromethylated
使用环糊精 (CD) 作为添加剂开发了芳香族化合物的区域选择性自由基 C-H 三氟甲基化。C-H三氟甲基化以高区域选择性进行,以良好的收率提供产品,即使是克级规模。在 CD 存在的情况下,一些底物选择性地进行单三氟甲基化,而在没有 CD 的情况下形成单三氟甲基化产物和双三氟甲基化产物的混合物。1 H NMR 实验表明区域选择性是通过在 CD 腔内包含基底来控制的。