The invention relates to a new process for the preparation of optically active amino acids and amino acid derivatives of the general formula (I), wherein *, X and R.sup.1 to R.sup.4 have the meaning given in the description. Starting from commercially obtainable (-)-menthol or (+)-menthol, the enantiomerically pure compounds of the formula (I) are obtained in high yields. The method is particularly suitable for the preparation of sterically demanding amino acids and amino acid derivatives.
该发明涉及一种制备光学活性
氨基酸和一般式(I)中的
氨基酸衍
生物的新工艺,其中*、X和R.sup.1至R.sup.4的含义如描述中所述。从商业上可获得的(-)-
薄荷脑或(+)-
薄荷脑出发,可以高产率地获得式(I)的对映纯化合物。该方法特别适用于制备立体位阻较大的
氨基酸和
氨基酸衍
生物。