A process for preparing racemic mixtures containing nearly equal amounts of stereo isomers of compounds of formula (I), or their salts, by heating an enantiomerically enriched material with thionyl chloride.
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A required useful enantiomer may thereby be recovered from unwanted mother liquors that would otherwise be otherwise be discarded.
一种制备含有化合物(I)的立体异构体近乎相等量的混合物或其盐的方法,通过将富集对映体的材料与
氯化硫酰加热。因此,可以从否则将被丢弃的不需要的母液中回收所需的有用对映体。