The SN2 reaction between diastereomerically enriched (R)-pantolactone (S)-α-bromoesters and sodium p-chloroaryloxide affords chiral aryloxy esters. Depending on the solvent used in the reaction, the diastereomeric ratios could be strongly modified or inverted. In DMSO, the epimerization can be prevented and the (R)-aryloxy esters are obtained with good diastereomeric ratios.
SN2反应中,使用了具有二对映体富集的(R)-pantolactone (S)-α-
溴酯和对
氯芳基氧化
钠,可以得到手性芳氧酯。根据反应中所用的溶剂,二对映体比率可能被大幅修改或反转。在
DMSO中,可以防止表异构化,从而以良好的二对映体比率获得(R)-芳氧酯。