1.How to choose the base used in the synthesis of arsine ylide is studied.

1.本文主要研究了德合成中碱的选择。

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

2.通过添剂、手性辅基、手性试剂等3种,别控制反应的非对映选择性和对映选择性。