A method for synthesizing enantiomerically enriched chemical intermediates with predetermined chirality is described. The method comprises formation of a pseudoephedrine amide, followed by stereoselective alkylation at the alpha carbon. The chiral auxiliary can then be cleaved off, affording chiral end products useful for further transformations. The enantiomeric enrichment of the chiral end products may exceed 98%, and the chiral auxiliary can be recovered. Novel amides of pseudoephedrine used in this method are also disclosed.
描述了一种合成拥有预定手性的对映体富集
化学中间体的方法。该方法包括形成伪
麻黄碱酰胺,然后在α-碳上进行立体选择性烷基化。然后可以将手性辅助基解离,得到有用于进一步转化的手性终产物。这些手性终产物的对映体富集度可能超过98%,手性辅助基可以回收利用。该方法中使用的伪
麻黄碱酰胺的新颖酰胺也被揭示。