Metal-Free Difluoromethylthiolation, Trifluoromethylthiolation, and Perfluoroalkylthiolation with Sodium Difluoromethane- sulfinate, Sodium Trifluoromethanesulfinate or Sodium Perfluoro- alkanesulfinate
A method for direct difluoromethylthiolation of Ar−H bonds is introduced. The stable and easy-to-handle HCF2SO2Na is reduced with (EtO)2P(O)H in the presence of TMSCl to generate HCF2S+ for the regioselective difluoromethylthiolation of aromatic compounds including indoles, pyrroles, and activated benzenes. This method is also applicable for the trifluoromethylthiolation with CF3SO2Na and the perf
介绍了一种直接的二氟甲硫基化Ar-H键的方法。在TMSCl存在下,用(EtO)2 P(O)H还原稳定易处理的HCF 2 SO 2 Na ,生成HCF 2 S +,用于芳香族化合物(包括吲哚,吡咯和活化)的区域选择性二氟甲基硫醇化反应苯。该方法也适用于用芳烃和杂芳烃用CF 3 SO 2 Na进行三氟甲基硫醇化和用R f SO 2 Na进行全氟烷基硫醇化。还讨论了与无金属亲电性氟代烷基硫基化反应相关的反应机理。
One-Pot Synthesis of Difluoromethyl Thioethers from Thiourea and Diethyl Bromodifluoromethylphosphonate
作者:Tianqi Ding、Lvqi Jiang、Wenbin Yi
DOI:10.1021/acs.orglett.7b03538
日期:2018.1.5
A straightforward one-pot synthesis of difluoromethyl thioethers from thiourea and diethyl bromodifluoromethylphosphonate has been developed. Thiourea is a cheap and friendly sulfur reagent, while diethyl bromodifluoromethylphosphonate is a low-cost and stable difluorocarbene precursor. The strategy enabled the introduction of SCF2H moieties into indoles, pyrroles, and activated arenes and formed a