Electrochemical trifluoromethylation of 3-sulpholene. Synthesis of meso- and DL-3,4-bis(trifluoromethyl) sulpholanes
作者:Wojciech Dmowski、Tomasz Kozłowski
DOI:10.1016/s0022-1139(97)00142-5
日期:1998.2
consisting of meso- and DL-3,4-bis(trifluorometayl)sulpholanes (2a) and (2b) as the major components and isomeric trifluoromethylsulpholenes 3a and 3b, 3,4-bis(trifluoromethyl)sulpholenes 4a and 4b, 3-trifluoromethylsulpholane 5 and 2,3,4-tris(trifluoromethyl) sulpholanes 6a-c as the minor components with a 40–50% total yield. Compounds 2a and 2b were efficiently isolated from the crude reaction mixture
在CF 3 COOH / CF 3 COONa / CH 3 CN / H 2 O系统中对3-硫丁烯(1)进行电化学三氟甲基化,得到由内消旋和DL-3,4-双(三氟甲基)磺砜(2a)组成的复杂混合物和(2b)作为主要成分,同分异构的三氟甲基亚砜3a和3b,3,4-双(三氟甲基)亚砜4a和4b,3-三氟甲基亚砜5和2,3,4-三(三氟甲基)砜6a-c为次要组分。组件的总产量为40%至50%。化合物2a和2b从粗制反应混合物中高效分离得到的苯并通过光谱方法完全鉴定。在没有乙腈的CF 3 COOH / CF 3 COONa / H 2 O系统中进行反应,尽管总收率很低,但得到的主要产物是4-三氟甲基-2-亚砜(3a)。