Novel 2,5-dioxopiperazine compounds and method for preparing alpha-aspartyl-L-phenylalanine methyl ester derivatives
申请人:Ajinomoto Co., Inc.
公开号:EP0538882A1
公开(公告)日:1993-04-28
A method of preparing α-APM derivatives without using an expensive L-phenylalanine is provided, wherein 2,5-dioxopiperazine-3-acetamide is reacted with acetic anhydride to give N,N'-diacetyl-6-cyanomethyl-2,5-dioxopiperazine, which is then reacted with benzaldehyde in the presence of a strong base to give 1-acetyl-3-benzylidene-6-cyanomethyl-2,5-dioxopiperazine. This is treated with hydrazine to give 3-benzylidene-6-cyanomethyl-2,5-dioxopiperazine, which is then reduced to prepare 3-benzyl-6-cyanomethyl-2,5-dioxopiperazine, which is converted by reaction with methanol in the presence of a strong acid to an α-APM derivative for use as a sweetener.
本发明提供了一种不使用昂贵的 L-苯丙氨酸而制备 α-APM 衍生物的方法,其中 2,5-二氧代哌嗪-3-乙酰胺与乙酸酐反应生成 N,N'-二乙酰基-6-氰基甲基-2,5-二氧代哌嗪,然后在强碱存在下与苯甲醛反应生成 1-乙酰基-3-亚苄基-6-氰基甲基-2,5-二氧代哌嗪。再用肼处理,得到 3-亚苄基-6-氰甲基-2,5-二氧代哌嗪,然后将其还原,制备出 3-苄基-6-氰甲基-2,5-二氧代哌嗪,在强酸存在下与甲醇反应,将其转化为用作甜味剂的 α-APM 衍生物。