Iridium‐Catalyzed Enantioselective C(sp³)−H Borylation of Aminocyclopropanes

Abstract

Transition‐metal‐catalyzed regio‐ and stereo‐controllable C−H functionalization remains a formidable challenge in asymmetric catalysis. Herein, we disclose the first example of iridium‐catalyzed C(sp3)−H borylation of aminocyclopropanes by using simple imides as weakly coordinating directing groups under mild reaction conditions. The reaction proceeded via a six‐membered iridacycle, affording a vast range of chiral aminocyclopropyl boronates. The current method features a broad spectrum of functional groups (36 examples) and high enantioselectivities (up to 99 %). We also demonstrated the synthetic utility by a preparative scale C−H borylation, C−B bond transformations, and conversion of the directing group.