The present invention relates to a method of removing triphenylmethane protection group. The method for preparing biphenyl benzoic acid derivatives of the present invention is economically advantageous and very excellent in the aspect of improving process in that: process safety is secured by using acidic ion exchange resin in the presence of organic solvent instead of using highly corrosive acid; the reaction takes much less time than do the conventional reactions which use only anhydrous methanol and few sub-reaction does occur; and the ion-exchange resin of the present invention is excellent for mass-processing because the resin can be collected and recycled only by filtration after being used.
本发明涉及一种去除三苯
甲烷保护基的方法。本发明的制备
联苯苯甲酸衍
生物的方法在经济上具有优势,并且在改进工艺方面非常出色,具体表现在:通过在有机溶剂存在的情况下使用酸性离子交换
树脂来确保工艺安全,而不是使用高腐蚀性酸;与仅使用无
水甲醇的传统反应相比,该反应所需时间大大缩短,几乎不会发生次级反应;本发明的离子交换
树脂非常适合大规模加工,因为使用后可以通过过滤收集和回收
树脂。