Processes for efficiently producing α-halo ketones, α-halohydrins and epoxides on an industrial scale. The prosesses include one for producing an α-halo ketone of general formula (3) by decarboxylating a product of reaction between a carboxilic acid derivative of general formula (1) and a metal enolate prepared from an α-haloacetic acid of general formula (2) or an acceptable salt thereof, one for producing an by reducing the α-halo ketone (3), and one for producing an epoxide (13) by treating the α-halohydrin (11) with a base to effect ring closure. The above prosesses are particularly suitable for producing optically active α-halo ketones, α-halohydrins and epoxides from the corresponding α-amino acid derivatives.
R1COA (1)
在工业规模上高效生产α-卤酮、α-卤素和
环氧化物的工艺。这些工艺包括通过对通式(1)的
羧酸衍
生物与通式(2)的α-卤
乙酸或其可接受的盐制备的
金属烯醇反应产物进行脱羧来生产通式(3)的α-卤酮的工艺,通过还原α-卤酮(3)来生产
环氧化物的工艺,以及通过用碱处理α-卤
水林(11)以实现闭环来生产
环氧化物(13)的工艺。上述方法特别适用于从相应的
α-氨基酸衍
生物中生产光学活性α-卤酮、α-卤代卤素和
环氧化物。
R1COA (1)