生物活性的天然化合物几乎都是光学活性体。用不对称还原非光学活性化合物中的对映面,而得到光学活性化合物的反应,从合成方法来说可以认为是理想的反应。可是实际上能满足化学得率及不对称得率两方面的反应尚未发现。 Almost all of the bioactive natural compounds are optically active. The asymmetric reduction of the enantiomeric compound in the non-optically active compound leads to the reaction of the optically active compound, which is considered as an ideal reaction from the synthetic method. However, in fact, the reactions that satisfy the chemical yield and the asymmetric yield have not been found yet.