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
已经通过用三苯基甲烷四氟硼酸酯对2-聚氟烷基-2 H-硫代吡喃进行氧化芳构化来合成2-多氟烷基硫代吡啶鎓盐。亲核加成甲醇中,在α位的碱性介质进行叠氮化钠,或尿素到2- trifluoromethylthiopyrylium四氟硼酸盐,得到相应的2-取代的6-三氟甲基-2- ħ -thiopyrans而咪唑,1,2-含氟, 3-三唑,硫羟乙酸钾和硝基甲烷钠提供2 H-和4 H-硫代吡喃的混合物。6-三氟甲基-2-甲氧基-2 H-噻喃的顺式-二羟基化反应可得到含氟的硫庚基吡喃糖苷衍生物8。