The α, α-gem-difluorination of 2', 4'-difluoro-α-(methylthio)acetophenone (1a) with N-fluoropyridinium salts gave 2', 4', α, α-tetrafluoro α-(methylthio)acetophenone (3a). This reaction was accelerated by the addition of zinc chloride, zinc bromide or anhydrous iron(III) chloride, and higher yields than the reaction without additives were obtained. The gem-difluorination reaction using FP-T300 in the presence of zinc bromide was applicable to other α-(alkylthio)acetophenone derivatives (1).
用 N-
氟吡啶鎓盐对 2',4'-二
氟-α-(甲
硫基)
苯乙酮 (1a) 进行α,α-
锗二
氟化反应,可得到 2',4',α,α-四
氟-α-(甲
硫基)
苯乙酮 (3a)。加入
氯化锌、
溴化锌或无
水氯化
铁(III)可加速该反应,并获得比不加入添加剂时更高的产率。在
溴化锌存在下使用 FP-T300 进行的宝石二
氟化反应适用于其他 α-(烷
硫基)
苯乙酮衍
生物 (1)。