Synthesis and applications of S-(trifluoromethyl)-2,8-bis(trifluoromethoxy)dibenzothiophenium triflate (Umemoto reagent IV)
作者:Sagar R. Mudshinge、Gerald B. Hammond、Teruo Umemoto
DOI:10.1016/j.jfluchem.2022.110015
日期:2022.9
trifluoromethylating agent, S-(trifluoromethyl)-2,8-bis(trifluoromethoxy)dibenzothiophenium triflate (Umemoto reagent IV), was developed. Due to the extraordinary electronic effect of trifluoromethoxy group, Umemoto reagent IV was easily synthesized by a one-pot method from readily available 3,3’-bis(trifluoromethoxy)biphenyl. It was shown that Umemoto reagent IV was more powerful than Umemoto reagent II and could trifluoromethylate
开发了一种新型、强效且易于操作的亲电三氟甲基化试剂,S- (三氟甲基)-2,8-双(三氟甲氧基)二苯并噻吩鎓三氟甲磺酸盐(Umemoto试剂IV)。由于三氟甲氧基的非凡电子效应,Umemoto试剂IV可以通过易得的3,3'-双(三氟甲氧基)联苯通过一锅法轻松合成。结果表明,Umemoto 试剂 IV 比 Umemoto 试剂 II 更强大,可以更有效地对多种亲核底物进行三氟甲基化。此外,Umemoto试剂IV成功地用于制备有用的三氟甲氧基化剂三氟甲基九氟磺酸酯。实现了用三氟甲磺酸酐将 2,8-双(三氟甲氧基)二苯并噻吩直接转化为 Umemoto 试剂 IV,尽管产率较低。