dichlorofluoroacetate, easily prepared from methyl trichloroacetate and antimony(III) fluoride, underwent the reductive coupling–elimination reaction with carbonyl compounds in the presence of zinc(0), a catalytic amount of copper(I) chloride, acetic anhydride, and molecular sieves to give the corresponding (Z)-α-fluoro-α,β-unsaturated carboxylic acid methyl esters in high yields.
二
氯氟乙酸甲酯很容易由
三氯乙酸甲酯和
氟化
锑 (III) 制备,在
锌 (0)、催化量的
氯化
铜 (I)、
乙酸酐和
分子筛存在下,与羰基化合物发生还原偶联消除反应以高收率得到相应的(Z)-α-
氟-α,β-不饱和
羧酸甲酯。