Abstract
AbstractThe stereoselective cyclopropanation of olefins with “boron ylide” is disclosed for the first time, providing a modular strategy for the synthesis of stereospecific diboryl‐functionalized cyclopropanes. The chiral gem‐diborylcyclopropanes are synthesized with excellent enantioselectivity with the aid of a chiral auxiliary. Based on the powerful transformable ability of boryl group, those challenging multi‐quaternary carbon centers in cyclopropane units have been facilely constructed with excellent stereoselectivity. Control experiments indicate that the boryl groups are necessary for both chemoselectivity and stereoselectivity control.
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