An improved process for the preparation of L-aspartic acid N-thiocarboxyanhydride by the reaction of a 0.75 to 1.25 molar solution of an N-alkoxy-thiocarbonyl L-aspartic acid in a lower alkyl acetate solvent with a phosphorous trihalide. The desired product is substantially insoluble in the lower alkyl acetate solvent and is recovered in pure form without further purification or separation steps.
一种改进的制备
L-天冬氨酸N-
硫代
羧酸酐的方法,通过将0.75至1.25摩尔的N-烷氧基
硫代
羧酸L-天冬氨酸在较低的烷基
醋酸溶剂中与三
卤化磷反应。所需产品在较低的烷基
醋酸溶剂中几乎不溶,可以在不需要进一步纯化或分离步骤的情况下以纯形式回收。