The present invention relates to a process for preparing a pharmaceutical starting compound compound by hydrolyzing a compound of the general formula (II): Wherein R
1
is protected carboxy, R
2
is lower alkoxy or higher alkoxy, A
1
is an aromatic bivalent group, heterocyclic bivalent group or cyclo(lower)alkane bivalent group, and A
2
is an aromatic bivalent group, heterocyclic bivalent group or cyclo(lower)alkane bivalent group, with aqueous potassium hydroxide and by treating with hydrochloric acid.
本发明涉及一种通过用
水合
氢氧化钾水解通式(II)化合物并用
盐酸处理来制备药物起始化合物的方法:其中,R1是保护的羧基,R2是低烷氧基或高烷氧基,A1是芳香二价基团,杂环二价基团或环(低)烷基二价基团,A2是芳香二价基团,杂环二价基团或环(低)烷基二价基团。