.beta.-Chloroalanine is prepared by reacting in an aqueous medium an aziridine-2-carboxylate with hydrogen chloride in an amount of 2.0-5.0 moles per mole of the aziridine-2-carboxyalte and causing the thus-formed .beta.-chloroalanine to selectively crystallize out from the liquid reaction mixture. Since the solution recovered after the isolation of the crystallized .beta.-chloroalanine still contains .beta.-chloroalanine and by-produced .alpha.-chloro-.beta.-alanine dissolved therein, they may be converted into an aziridine-2-carboxylate by treating them with a base to recirculate it for reuse.
.beta.-
氯丙
氨酸是通过在
水介质中反应2-氮杂环
丙酸酯与氢
氯酸反应,反应物的摩尔比为2.0-5.0,从而使所形成的.beta.-
氯丙
氨酸从液态反应混合物中选择性结晶出来制备的。由于在分离结晶出的.beta.-
氯丙
氨酸后,溶液中仍含有.beta.-
氯丙
氨酸和副产物α-
氯-.beta.-丙
氨酸,因此可以通过用碱处理它们将其转化为2-氮杂环
丙酸酯以便再次循环使用。