The present invention provides a novel process for the preparation of 5-arylhydantoins as an important intermediate of (D)-arylglycines (e.g., (D)-p-hydroxyphenyl-glycine) useful for the synthesis of semisynthetic penicillines and cephalosporins, the process comprising (i) reacting a 5-unsubstituted hydantoin compound with a halogenating agent and (ii) reacting the resulting product with a p-unsubstituted phenol compound, the hydroxy group of which may be protected, to substitute the 5-position of the hydantoin compound with the phenol compound at the para position.
本发明提供了一种新型的制备5-芳基
咪唑啉的方法,作为(D)-芳基甘
氨酸(例如(D)-
对羟基苯甘氨酸)的重要中间体,用于合成半合成
青霉素和头霉素,该方法包括(i)将5-未取代
咪唑啉化合物与卤代试剂反应,(ii)将所得产物与p-未取代
酚类化合物反应,其中
酚类化合物的羟基可能被保护,以在
咪唑啉化合物的5位与
酚类化合物在对位进行取代。