2-Polyfluoroalkyl thiopyrylium salts: synthesis and reactions with nucleophiles
作者:Sergiy A. Siry、Vadim M. Timoshenko
DOI:10.1016/j.tetlet.2010.09.131
日期:2010.12
2-Polyfluoroalkylthiopyrylium salts have been synthesized by oxidative aromatization of 2-polyfluoroalkyl-2H-thiopyrans with triphenylmethane tetrafluoroborate. Nucleophilic addition of methanol, sodium azide, or urea to 2-trifluoromethylthiopyrylium tetrafluoroborate in a basic medium proceeds at the α-position to give the corresponding 2-substituted 6-trifluoromethyl-2H-thiopyrans whereas imidazoles