Three strategies (additive, chiral auxiliary or chiral reagent) were developed to improve the diastereoselectivity or enantioselectivity of the ylide cyclopropanation reactions.

通过添加剂、手辅基、手试剂等3种策略,分别控制反应映选择映选择。

The enantioselectivity of N-dodecanoyl-L-proline-3,5-dimethyl-anilide is also good, but the basic line fluctuates strongly due to containing benzene ring in its molecular structure.

用N-十二酰基-L-脯氨酸-3,5-二甲基苯胺作添加剂，手选择也较好，但由于含有苯环，紫外吸收增强，基线波动严重。