The study indicates that solvent plays an important role in the reaction, with the decreasing of the solvent polarity, the yield of the reaction and the ratio of a-anomer to β-anomer both decrease. 结果表明,溶剂极性在反应过程中发挥了很重要的作用,随着溶剂极性的降低,反应的总产率以及α-体与β-体的比值都降低。