发明授权
US4434107A Process for preparing an optically active p-hydroxyphenylglycine or a salt thereof 失效
制备光学活性对羟基苯基甘氨酸或其盐的方法

Process for preparing an optically active p-hydroxyphenylglycine or a
salt thereof
摘要:
The present invention relates to the optical resolution of a p-hydroxyphenylglycine salt with simultaneous racemization of the undesired enantiomer thereof. The invention is carried out by preferential crystallizing out the desired enantiomer from a supersaturated solution of the racemic modification thereof in a lower aliphatic acid in the presence of an aliphatic or aromatic aldehyde.
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