yields. The magnesium enolates derived from the α-chloro-α-sulfinyl acid derivatives were trapped with carbonyl compounds to afford the adducts, which were transformed to α, β-epoxy carboxylic acid derivatives. Thermal elimination of the sulfinyl group in the α-halo-α-sulfinyl acid derivatives and the α-halo-α-sulfinyl aldehydes gave α-halo-α, β-unsaturated carboxylic acid derivatives and α-halo-α,
描述了一种合成α-卤代(C1,F)
羧酸衍
生物和α-卤代醛的新方法。α-卤代-α-亚磺酰基
羧酸,酯和α-卤代-α-亚磺酰基醛分别容易地由芳基1-卤代烷基亚砜,
氯代
甲酸烷基酯和
甲酸乙酯制备,产率高。由(对
甲苯硫基)
乙酸合成α-
氯-α-亚磺酰基酰胺。这些酸,酯,酰胺和醛的亚磺酰基与
乙基溴化镁的
配体交换反应,得到了烯醇
镁,将其用
水处理后,以高收率得到α-卤代
羧酸衍
生物和α-
氯醛。用羰基化合物捕获由α-
氯代-α-亚磺酰基酸衍
生物衍生的烯醇
镁,以提供加合物,将其转化为α,β-环氧
羧酸衍
生物。