申请人:Evonik Degussa GmbH
公开号:US08299293B2
公开(公告)日:2012-10-30
A method for preparing α-keto acids, especially α-ketomethionine, and/or derivatives thereof, whereby an aldehyde is reacted with thiols to give a corresponding dithioacetal, the dithioacetal formed, is reacted with an electrophile in the presence of a strong base, and the resulting α,α-(dithio)carboxylic acid is solvolyzed with acid-catalysis to release thiol and give the α-keto acid or a derivative thereof. Umpolung of aliphatic or aromatic aldehydes is effected by reaction with thiols.
一种制备α-酮酸,特别是α-酮甲硫氨酸和/或其衍生物的方法,通过将醛与硫醇反应以形成相应的二硫代缩醛,所形成的二硫代缩醛在强碱存在下与亲电试剂反应,得到α,α-(二硫)羧酸,然后通过酸催化的溶解作用释放出硫醇并给出α-酮酸或其衍生物。通过与硫醇反应实现脂肪族或芳香族醛的Umpolung。