Iridium-Catalyzed Enantioselective Unbiased Methylene C(sp(3))-H Borylation of Acyclic Amides

摘要

We herein report amide directed enantioselective beta-C(sp(3))-H borylation of unbiased methylene C-H bonds of acyclic amides enabled by iridium catalysis for the first time. The key to the success of this transformation relies on the careful selection of the combination of iridium precursor and chiral bidentate boryl ligands. A variety of functional groups are well-tolerated, affording chiral beta-functionalized amides in good to excellent enantioselectivities. We also demonstrate the application of the current method by stereospecific conversion of C-B bond into other functionalities.