The present invention relates to a method for the preparation of active ester, characterized by subjecting to a reaction a mixture of a carboxylic acid, which is a starting material, reagent which forms active ester and a base or a starting material carboxylic acid.
The present invention provides an active ester useful as an intermediate of pharmaceutical drugs etc. in high yield using an inexpensive reagent, in one-pot reaction, without causing isomerization, regardless of the structure of starting material carboxylic acid.
本发明涉及一种活性酯的制备方法,其特征在于将
羧酸、生成活性酯的试剂和碱或起始物
羧酸的混合物进行反应。本发明提供了一种高产率的活性酯,可用作制药等领域的中间体,使用廉价试剂,在一锅反应中进行,无论起始物
羧酸的结构如何,均不会发生异构化。