Process for preparing 1-substituted 5-hydroxy-imidazoline-2,4-diones and 1-substituted 5-alkoxy-imidazoline-2,4-diones
申请人:Bayer Aktiengesellschaft
公开号:US06365752B1
公开(公告)日:2002-04-02
A process for preparing specific 1-substituted 5-hydroxy-imidazoline-2,4-diones by reacting glyoxylic acid with N-substituted ureas is provided, where this process is carried out in a 10-80% strength aqueous solution and in the presence of an acid catalyst. The 1-substituted 5-hydroxy-imidazoline-2,4-diones can subsequently be converted in a further reaction step to give 1-substituted 5-alkoxy-imidazoline-2,4-diones.
提供一种制备特定的1-取代的5-羟基咪唑啉-2,4-二酮的方法,该方法通过将乙醛酸与N-取代脲反应,在10-80%浓度的水溶液中,在酸催化剂的存在下进行。随后,1-取代的5-羟基咪唑啉-2,4-二酮可以在进一步的反应步骤中转化为1-取代的5-烷氧基咪唑啉-2,4-二酮。