申请人:SHIONOGI & CO., LTD.
公开号:EP0739885A1
公开(公告)日:1996-10-30
A process for the preparation of 3-isoxazolecarboxlic acid which is an intermediate for prepearing useful compounds is provided, said process being characterized in that a compound of formula (I) is reacted with hydroxylamine to obtain a compound of formula (II), and the compound thus obtained is treated with an alkali:
wherein R1 is a lower alkyl, R2 is a carboxy protecting group, X is a halogen atom, and Y is a hydrogen atom, or X and Y together may form a single bond.
本发明提供了一种制备 3-异噁唑羧酸的工艺,该工艺是预生成有用化合物的中间体,其特征在于,将式(I)化合物与羟胺反应得到式(II)化合物,然后用碱处理由此得到的化合物:
其中 R1 为低级烷基,R2 为羧基保护基团,X 为卤素原子,Y 为氢原子,或 X 和 Y 可一起形成单键。