A novel compound has pharmacological activities comparable to those of Nahlsgen and is storable excellently stably. The compound can be produced by a method according to the present invention for producing an optically active 2-amino-phosphonoalkanoic acid salt. In the method, a starting material DL-2-amino-phosphonoalkanoic acid represented by Formula (1) or a hydrate thereof is reacted with an optically active basic compound other than an optically active lysine, to give a diastereomeric salt mixture including a first salt (including a hydrate salt) between a D-2-amino-phosphonoalkanoic acid represented by Formula (1-1) and the optically active basic compound, and a second salt (including a hydrate salt) between an L-2-amino-phosphonoalkanoic acid represented by Formula (1-2) and the optically active basic compound. The diastereomeric salt mixture is fractionally crystallized to isolate one of the first and second diastereomeric salts.
一种新的化合物具有与Nahlsgen相媲美的药理活性,并且具有出色的稳定性。该化合物可以通过根据本发明用于生产光学活性2-
氨基
磷酸酯盐的方法来生产。在该方法中,以式(1)表示的起始材料D
L-2-
氨基
磷酸酯或其
水合物与光学活性的碱性化合物(不包括光学活性赖
氨酸)发生反应,形成一个不对映异构盐混合物,其中包括D-2-
氨基
磷酸酯(式(1-1)表示)和光学活性碱性化合物之间的第一盐(包括
水合盐),以及
L-2-
氨基
磷酸酯(式(1-2)表示)和光学活性碱性化合物之间的第二盐(包括
水合盐)。将不对映异构盐混合物进行分级结晶以分离第一和第二不对映异构盐中的一种。