The process described makes it possible to obtain optically pure 4-amino-3-hydroxycarboxylic acids by means of a series of stereoselective steps. The starting material is an alpha-amino acid in the L or D configuration, with which Meldrum's acid is reacted. The resulting pyrrolone derivative is reduced prior to opening of the pyrrolidine ring. The invention also relates to the new products obtained by the said process and to the pyrrolone derivatives obtained as intermediates.
所描述的过程通过一系列立体选择性步骤使得获得光学纯的4-
氨基-3-羟基
羧酸成为可能。起始材料是具有L或D构型的
α-氨基酸,与Meldrum's酸反应。在打开
吡咯烷环之前,所得的
吡咯酮衍
生物被还原。该发明还涉及所述过程获得的新产品以及作为中间体所得的
吡咯酮衍
生物。