Synthesis of Chiral Sulfoximines via Iridium‐Catalyzed Regio‐ and Enantioselective C−H Borylation: A Remarkable Sidearm Effect of Ligand

Abstract

Transition metal-catalyzed enantioselective CÀ H activation of prochiral sulfoximines for nonannulated products remains a formidable challenge. We herein report iridium-catalyzed enantioselective CÀ H borylation of N-silyl diaryl sulfoximines using a welldesigned chiral bidentate boryl ligand with a bulky side arm. This method is capable of accommodating a broad range of substrates under mild reaction conditions, affording a vast array of chiral sulfoximines with high enantioselectivities. We also demonstrated the synthetic utility on a preparative-scale CÀ H borylation for diverse downstream transformations, including the synthesis of chiral version of bioactive molecules. Computational studies showed that the bulky side arm of the ligand confers high regio-and enantioselectivity through steric effect.