Excellent Z or E selectivity is observed in the
HornerâWadsworthâEmmons reactions of methyl
bis(trifluoroethyl)phosphonoacetate 2 with aryl alkyl ketones 3aâd
or aldehydes 3f,g using Sn(OSO
2
CF
3
)
2
in
the presence of N-ethylpiperidine, which should have a different
reaction mode to those using sodium hydride.
在甲基双(三
氟乙基)
膦酸酯2与芳基烷基酮3a~d或醛3f、g的Horner-Wadsworth-Emmons反应中,使用Sn(OSO2CF3)2并在
N-乙基哌啶的存在下,观察到了优异的Z或E选择性,这与使用氢化
钠的反应模式应有所不同。