ja0c02803_si_002.cif (742.8 kB)

A Chiral Phenanthroline Ligand with a Hydrogen-Bonding Site: Application to the Enantioselective Amination of Methylene Groups

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posted on 14.04.2020, 14:38 by Rajasekar Reddy Annapureddy, Christian Jandl, Thorsten Bach
A silver-catalyzed amination is reported that occurs at the aliphatic C3-substituent of various quinolones and pyridones. The C–H amination reaction proceeded with high site- and enantioselectivity (14 examples, 83–97% ee). The key to its success is the use of a chiral phenanthroline ligand that is attached via an ethynyl linker to the 8-position of octahydro-1H-4,7-methanoisoindol-1-one. AgPF6 (10 mol %) served as the silver source, PhINNs as the nitrene precursor, and 1,10-phenanthroline as the coligand. The reaction outcome can be understood by assuming a nitrene C–H insertion within a hydrogen-bonded silver complex in which a single C–H bond is exposed to the catalytic reaction center.