Reaction of the Ruppert–Prakash reagent (Me3SiCF3) with aromatic aldehydes in the presence of triphenylphosphine, lithium iodide and lithium tetrafluoroborate selectively furnishes gem-difluorinated phosphonium salts. Simple alkaline hydrolysis of these salts results in difluoromethylated products. Thus, one-pot nucleophilic difluoromethylation of aromatic aldehydes using Me3SiCF3 has been accomplished
在
三苯基膦,
碘化
锂和四
氟硼酸锂的存在下,Ruppert-Prakash试剂(Me 3 SiCF 3)与芳族醛的反应选择性地提供了宝石二
氟化phospho盐。这些盐的简单碱性
水解产生二
氟甲基化产物。因此,已经实现了使用Me 3 SiCF 3一锅法
芳香族醛的亲核二
氟甲基化。该方案容许吸电子以及给电子取代基。