[reaction: see text]. In the presence of GaCl3, silyl enol ethers derived from alpha-substituted beta-ketoesters or malonates are ethenylated at the alpha-carbon atom with trimethylsilylethyne in high yields. Ethenylmalonates can also be synthesized by this method.
[反应:请参见文字]。在GaCl 3存在下,以高收率将由α-取代的β-
酮酸酯或
丙二酸酯衍生的甲
硅烷基烯醇醚在α-碳原子处用三甲基甲
硅烷基
乙炔进行
乙烯基化。烯
丙二酸酯也可以通过该方法合成。