2,5-Dioxopiperazine compound and processes for preparation thereof
申请人:Ajinomoto Co., Inc.
公开号:EP0493813A1
公开(公告)日:1992-07-08
2,5-Dioxopiperazine-3-acetamide is prepared by reacting a dialkyl-L-aspartate with monochloroacetic acid, monochloroacetyl chloride or monochloroacetic acid anhydride, and then treating the resulting dialkyl chloroacetyl-L-aspartate with ammonia.
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.
Pharmaceutical composition for inhibiting alpha-glucosidase
申请人:Tamkang University
公开号:US10159668B2
公开(公告)日:2018-12-25
A composition for inhibiting α-glucosidase has lower side effects to a user, other than the inhibition of α-glucosidase. The composition comprises adenine, (3-hydroxy-dl-proline, nicotinic acid, (3,6-dioxo-piperazin-2-yl)-acetic acid amide, 2-ethylhexyl heptanoate, and a pharmaceutically compatible salt.