Efficient interconversion of α,α-difluoromethylenephosphonates and α,α-difluoromethylenephosphonothioates
作者:Serge R. Piettre
DOI:10.1016/0040-4039(96)00912-4
日期:1996.7
Treatment of dialkyl 1,1-difluoromethylenephosphonates 1 with Lawesson's reagent cleanly produces the corresponding dialkyl 1,1-difluoromethylenephosphonothioates 2. The reaction can be extended to dialkyl 1,1-difluoromethylenephosphinates and to dialkyl 1,1-difluoromethylenephosphine oxides. The reversed transformation (i.e. converting dialkyl 1,1-difluoromethylenephosphonothioates into dialkyl 1
用Lawesson试剂处理二烷基1,1-二氟亚甲基膦酸酯1可以干净地产生相应的二烷基1,1-二氟亚甲基膦硫酸酯2。该反应可以扩展为1,1-二氟亚甲基次膦酸二烷基酯和1,1-二氟亚甲基次膦氧化物二烷基。反转变换(即转换的二烷基1,1- difluoromethylenephosphonothioates成二烷基1,1- difluoromethylenephosphonates)是最方便地通过使用双环氧乙烷达到7或全氟-顺式-2- Ñ丁基-3- Ñ -propyloxaziridine 8,并产生所希望的高产率的膦酸酯。讨论了这些转换的综合兴趣。