Ethylenediamine-N,N'-diacetic acid-N'-cyanomethyl, salts thereof, and their preparation
申请人:HAMPSHIRE CHEMICAL CORP.
公开号:EP0546866A2
公开(公告)日:1993-06-16
A novel intermediate useful in the synthesis of ethylenediaminetriacetic acid (ED3A) or its salts. A salt of N,N′-ethylenediaminediacetic acid (ED2AH₂) is condensed with formaldehyde to form a stable 5-membered ring intermediate. The addition of cyanide across this cyclic material forms ethylenediamine N,N′-diacetic acid-N′-cyanomethyl or salts thereof (mononitrile-diacid), which is a useful intermediate in the production of ED3A. The nitrile in aqueous solutions may be spontaneously cyclized to form 2-oxo-1,4-piperazinediacetic acid (3KP) or salts thereof. In the presence of excess base, salts of ED3A are formed in excellent yield and purity.
一种可用于合成乙二胺三乙酸(ED3A)或其盐类的新型中间体。N,N′-乙二胺三乙酸(ED2AH₂)的一种盐与甲醛缩合形成稳定的五元环中间体。在这种环状物质上加入氰化物会形成乙二胺 N,N′-二乙酸-N′-氰基甲基或其盐类(一腈二酸),这是生产 ED3A 的有用中间体。水溶液中的腈可自发环化形成 2-氧代-1,4-哌嗪二乙酸(3KP)或其盐。在过量碱的存在下,ED3A 的盐类会以极高的产率和纯度生成。