.alpha.-Alkylated, acyclic .alpha.-aminocarboxylic acids of the formula ##STR1## where * represents a center of asymmetry, R.sup.1 is a lower alkyl, allyl, benzyl or substituted benzyl group and R.sup.2 is a lower alkyl, methoxymethyl, lower alkylmercaptoethyl, phenyl, phenyl substituted with alkyl or alkoxy, benzyl, or benzyl substituted with alkyl, alkoxy or halo are produced by an enantio-selective plural step process from the corresponding .alpha.-aminocarboxylic acid monomethyl or monoethyl amide. A particular advantage of the new process is that there can be produced from one educt-enantiomer, i.e. from an (S)- or an (R)-.alpha.-aminocarboxylic acid, selectively depending on the reaction conditions used the two enantiomeric forms of the desired .alpha.-alkyl-.alpha.-aminocarboxylic acid.
该方法通过对应的
α-氨基酸单甲基或单乙基酰胺进行对映选择性的多步骤过程,制备具有以下式子的α-烷基化,无环α-
氨基
羧酸:##STR1## 其中*表示不对称中心,R1为较低的烷基,烯丙基,苄基或取代苄基基团,R2为较低的烷基,甲氧基甲基,较低的烷基巯基乙基,苯基,取代烷基或烷氧基的取代苯基,苄基或取代烷基,烷氧基或卤素的取代苄基。该新方法的一个特殊优点是,可以从一个底物对映体即从(S)-或(R)-α-
氨基
羧酸,根据所使用的反应条件有选择性地产生所需的α-烷基-α-
氨基
羧酸的两种对映异构体。