Selective preparation of 1-substituted 2,2-difluoroethenyl phosphates or 1-hydroxyalkanephosphonates through the reaction of chlorodifluoromethyl ketones with dialkyl or diaryl phosphites
作者:Takashi Ishihara、Masayuki Yamana、Takashige Maekawa、Manabu Kuroboshi、Teiichi Ando
DOI:10.1016/s0022-1139(00)83035-3
日期:1988.1
Various chlorodifluoromethyl ketones react readily with dialkyl or diaryl phosphites in the presence of triethylamine at the reflux temperature of tetrahydrofuran to give the corresponding dialkyl or diaryl 1-substituted-2,2-difluoroethenyl phosphates in good yields, whereas the similar reaction conducted at lower temperature (0-20 °C) affords 1-(chlorodifluoromethyl)-1-hydroxyalkanephosphonates almost
在三乙胺的存在下,在四氢呋喃的回流温度下,各种氯二氟甲基酮很容易与亚磷酸二烷基酯或亚磷酸二芳酯反应,以较高的收率得到相应的二烷基或二芳基1-取代的2,2-二氟乙烯基磷酸酯,而在较低的温度下进行类似的反应(0-20℃)几乎只得到1-(氯二氟甲基)-1-羟基链烷膦酸酯。通过在回流的四氢呋喃中用三乙胺或甲醇钠处理,将后一种化合物转化为前一种烯醇式磷酸酯。