α-Fluoro-β-trifluoromethyl-α,β-unsaturated esters were synthesized via the reaction of diethyl (1-fluoro-1-
carbethoxymethyl) phosphonate with a variety of aromatic/heterocyclic trifluoromethyl ketones and trifluoroacetaldehyde
ethyl hemiacetal by the Horner-Wadsworth-Emmons (HWE) coupling. The effect of base, solvent, as well as reactant ratio
has been investigated. The present method is highly stereoselective, attractive and convenient for the synthesis of the
target compounds due to the availability of the reagents, simplicity of the approach and good yields of the products.
α-
氟-β-三
氟甲基-α,β-不饱和酯是通过(1-
氟-1-甲氧羰基甲基)
膦酸二乙酯与多种芳香族/三
氟甲基酮和三
氟乙醛乙基
半缩醛的反应,采用霍纳-沃兹沃斯-埃蒙斯(HWE)偶联法合成的。研究了碱、溶剂和反应物比例的影响。由于试剂易得、方法简单、产物收率高,本方法具有高度的立体选择性,对目标化合物的合成具有吸引力且非常方便。