The reaction of diethyl alkylphosphonates with chlorotrimethylsilane in the presence of lithium diisopropylamide leads to the corresponding diethyl 1-lithio(trimethylsilyl)alkylphosphonates which are cleanly halogenated (X = F, Cl, Br, I) with electrophilic reagents and then deprotected to give pure diethyl a-monohalogenoalkylphosphonates. The reaction has been extended by the onepot conversion of
在
二异丙基氨基
锂存在下,烷基
膦酸二乙酯与三
甲基氯硅烷反应生成相应的 1-
锂硫(三甲基甲
硅烷基)烷基
膦酸二乙酯,该二
乙酯用亲电子试剂完全卤化(X = F、Cl、Br、I),然后脱保护得到纯
二乙基α-单卤代烷基
膦酸酯。通过将
磷酸三乙酯单锅转化为α-单卤代
丁基膦酸二乙酯,该反应得到了扩展,总产率为 85-97%。