(Trifluoromethyl)thiolation of 2-Alkynylbenzoates: An Efficient Route to 4-[(Trifluoromethyl)thio]-1<i>H</i>-isochromen-1-ones
作者:Yuewen Li、Guangming Li、Qiuping Ding
DOI:10.1002/ejoc.201402629
日期:2014.8
The incorporation of the (trifluoromethyl)thio group into the isocoumarin scaffold through a Lewis-acid-mediated electrophilic cyclization reaction of 2-(2-alkynyl)benzoates with trifluoromethanesulfanylamide is reported. The transformation proceeds well in the presence of BiCl3 and BF3·Et2O under mild conditions to give 4-[(trifluoromethyl)thio]-1H-isochromen-1-ones regioselectively and in good yields
Trifluoromethylthiolation/Selenolation and Lactonization of 2-Alkynylbenzoate: The Application of Benzyl Trifluoromethyl Sulfoxide/Selenium Sulfoxides as SCF<sub>3</sub>/SeCF<sub>3</sub> Reagents
作者:Haofeng Shi、Xingzong Wang、Xiaoxian Li、Beibei Zhang、Xuemin Li、Jingran Zhang、Jingyue Yang、Yunfei Du
DOI:10.1021/acs.orglett.2c00563
日期:2022.3.25
The combined use of BnS(O)CF3/BnSe(O)CF3 with Tf2O as SCF3/SeCF3 reagents was implemented to realize an efficient synthesis of biologically interesting 4-(trifluoromethylthio/trifluoromethylseleno)isocoumarins from 2-alkynylbenzoates. The mechanistic pathway was postulated to involve formation of the electrophilic SCF3/SeCF3 species via interrupted Pummerer reactions followed by a concerted triflu