α-L-Aspartyl-L-phenylalanine methyl ester (α-APM) is prepared by catalytic hydrogenation of N-benzyloxycarbonyl-α-L-aspartyl-L-phenylalanine methyl ester (Z-α-APM). The catalytic hydrogenation is conducted in an aqueous suspension containing the Z-α-APM in the form of particles whose average particle size is not greater than 800 µm. The starting Z-α-APM may contain up to 30 wt.% of its β-isomer provided that the process additionally includes recrystallization of the α-APM, collection of the α-APM by filtration and recycling of the filtrate for use in the aqueous suspension of Z-α-APM.
α-L-天冬
氨酰-
L-苯丙氨酸甲酯(α-
APM)是通过催化加
氢 N-苄氧羰基-α-L-天冬
氨酰-
L-苯丙氨酸甲酯(Z-α-
APM)制备的。催化
氢化在含有 Z-α-
APM 的
水悬浮液中进行,Z-α-
APM 为平均粒径不大于 800 微米的颗粒形式。起始 Z-α-
APM 可含有多达 30 重量%的其 β-异构体,条件是该工艺还包括 α-
APM 的重结晶、通过过滤收集 α-
APM 以及回收滤液用于 Z-α-
APM 的
水悬浮液。