A tandem reaction of thioesters with vinylmagnesium bromide is reported. The initial acyl substitution provides an α,β-unsaturated ketone which further reacts with the liberated thiolate. This transition-metal-free synthesis of β-sulfanyl ketones takes place under mild reaction conditions, whereas the addition of a second Grignard molecule is almost completely suppressed. The carefully chosen parameters
据报道,
硫酯与
乙烯基溴化镁发生串联反应。最初的酰基取代提供了α,β-不饱和酮,该酮进一步与释放的
硫醇盐反应。β-
硫烷基酮的这种无过渡
金属的合成在温和的反应条件下进行,而几乎完全抑制了第二个格氏分子的添加。精心选择的参数可以使不同的底物以中等到良好的产率转化。