Process for the preparation of L-homoalanin-4-yl(methyl)-phosphinic acid (esters) of the formula I ##STR1## (R, R.sub.1 =H, alkyl) or salts thereof by reacting an R-3-isopropyl-2,5-dialkoxy-3,6-dihydropyrazine of the formula II with a .beta.-halogenoethyl(methyl)phosphinic acid ester of the formula IV ##STR2## (R', R.sub.1 '=alkyl) to give compounds of the formula V ##STR3## and then subjecting the latter to hydrolytic cleavage.
制备L-同型丙
氨酸-4-基(甲基)-
膦酸酯(盐)的方法如下:通过将式II中的R-3-异丙基-2,5-二烷氧基-3,6-二氢
吡嗪与式IV中的.beta.-卤代乙基(甲基)
膦酸酯(R',R1' =烷基)反应,得到式V的化合物,然后进行
水解裂解。其中,式I为:##STR1##(R,R1 = H,烷基),式II为:R-3-异丙基-2,5-二烷氧基-3,6-二氢
吡嗪,式IV为:##STR2##(R',R1' = 烷基),式V为:##STR3##。