A new version of Umemoto’s reagents: A three-step one-pot preparation of 2,3,7,8-tetrafluoro-S-(trifluoromethyl)dibenzothiophenium triflate
作者:Teruo Umemoto、Xiaocong Zhou、Yuanqiang Li
DOI:10.1016/j.jfluchem.2019.109347
日期:2019.10
method was developed for the practical preparation of powerful electrophilic trifluoromethylating agent, 2,3,7,8-tetrafluoro-S-(trifluoromethyl)dibenzothiophenium triflate 2. This method comprised of three steps; (1) in situ generation of trifluoromethanesulfinyl trifluoroacetate 7, (2) treatment of 3,3′,4,4′-tetrafluorobiphenyl with 7 in the presence of trifluoromethanesulfonic acid and trifluoroacetic
开发了一种新的一锅法,用于实用的强力亲电子三氟甲基化剂2,3,7,8-四氟-S-(三氟甲基)二苯并噻吩三氟甲磺酸盐2。该方法包括三个步骤。(1)在三氟甲磺酸和三氟乙酸酐的存在下用7原位生成三氟甲亚磺酰基三氟乙酸酯7,(2)用3处理3,3',4,4'-四氟联苯,以及(3)用氢处理所得混合物过氧化物。通过这种有效的三步一锅法,通过简单的水洗方法可以很好地分离得到2。因此,预计可以轻松访问2由于四氟试剂2的功能比2,8-二氟-S-(三氟甲基)二苯并噻吩三氟甲磺酸盐1强大得多,因此可能会导致其在许多领域的广泛应用或新应用。