Improved methods for preparation of the tetrasodium and disodium salts of N-(phosphonoacetyl)-L-aspartic acid (PALA) are disclosed. The present methods are well suited for preparation of these products in large amounts. Particular aspects of these methods include: (1) initial preparation of the PALA moiety as the dibenzyl ester; (2) the complete removal of impurities in the form of acetic acid and sodium acetate from disodium PALA by turbulent flow precipitation; and (3) preparation and purification of the cyclohexylammonium salt of dibenzyl PALA which ultimately results in a purer final product.
本文揭示了制备N-(
磷酸乙酰)-L-天冬酰胺酸(PA
LA)的四钠盐和二钠盐的改进方法。目前的方法非常适合大量制备这些产品。这些方法的特定方面包括:(1)将PA
LA基团最初制备为二苯甲酯;(2)通过湍流沉淀完全去除
乙酸和
醋酸钠形式的杂质,从而制备出二
钠PA
LA;以及(3)制备和纯化二苯甲酰PA
LA的
环己胺盐,最终导致更纯净的最终产品。