The invention discloses a process for enantiomeric enrichment of 2',6'-pipecoloxylidide using a chiral carbamoyl benzoic acid to provide (S)-enantiomer in high yield and high enantiomeric purity. The invention also discloses novel intermediates formed in the process of enantiomeric enrichment of 2',6'-pipecoloxylidide, preparation of N- substituted amidic acids and alkylation of 2',6'-pipecoloxylidide.
该发明揭示了一种利用手性碳酰
苯甲酸对2',6'-
哌啶甲醯氧乙酰胺进行对映体富集的过程,以高产率和高对映体纯度提供(S)-对映体。该发明还揭示了在对2',6'-
哌啶甲醯氧乙酰胺进行对映体富集的过程中形成的新型中间体,N-取代酰胺酸的制备以及对2',6'-
哌啶甲醯氧乙酰胺进行烷基化的方法。