The present invention relates to methods of subjecting a mixture of stereoisomers to epimerization and optionally recrystallization procedures to obtain a desired stereoisomer in high yield and purity. Relying upon solubility differences, the epimerization desirably is carried out in a solvent mixture that extends the epimerization equilibrium in favor of the desired stereoisomer. Recrystallization from a solvent mixture upgrades the purity even more. Purified stereoisomers are useful in many applications such as intermediates in the synthesis of pharmacologically important molecules.
本发明涉及将立体异构体混合物经受对映异构化和可选再结晶程序,以获得高产率和纯度的所需立体异构体的方法。依靠溶解度差异,对映异构化通常在使所需立体异构体处于有利位置的溶剂混合物中进行。从溶剂混合物中再结晶可以进一步提高纯度。纯化的立体异构体在许多应用中非常有用,例如在合成药理学重要分子的
中间体中。