An amino-protected L-aspartic acid, such as t-butyloxycarbonyl-beta-benzyl-L-aspartic acid, is prepared by first forming the amino-protected compound in the presence of a tertiary amine base having a pKa value of about 9 to about 12, water, and a water-immiscible polar organic solvent so as to produce a non-aqueous solution containing a salt form of amino-blocked-beta-benzyl-L-aspartic acid. The thus produced non-aqueous solution is then isolated, or next acidified and treated further to ultimately recover therefrom the amino-protected L-aspartic acid in crystalline form.
制备
氨基保护的
L-天冬氨酸(如 t-丁氧羰基-beta-苄基-
L-天冬氨酸)的方法是,首先在 pKa 值约为 9 至 12 的叔胺碱、
水和不溶于
水的极性有机溶剂存在下形成
氨基保护的化合物,从而制得含有
氨基受阻的-beta-苄基-
L-天冬氨酸盐形式的非
水溶液。 然后将制得的非
水溶液分离出来,或接下来进行酸化和进一步处理,最终从中回收结晶形式的
氨基保护的
L-天冬氨酸。