Cyclopropane unit as a fundamental structure performs a key role in a wide range of natural products as well as biological active molecules.[1] Because of the importance of cyclopropanes, enormous effort has therefore been devoted to this activity, and considerable methods have been developed for the construction of cyclopropane derivatives.[2] Generally, this small and highly strained skeleton is established by the addition of a carbine to an electron-deficient olefin.[3] In addition, Michael-initiated ring-closure procedures are also good approaches for the synthesis of multifunctionalized c...
