Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Cooperative Effects between Chiral Cpx–Iridium(III) Catalysts and Chiral Carboxylic Acids in Enantioselective C−H Amidations of Phosphine Oxides

Cooperative Effects between Chiral Cpx–Iridium(III) Catalysts and Chiral Carboxylic Acids in Enantioselective C−H Amidations of Phosphine Oxides
Yun-Suk Jang, Nicolai Cramer, Michael Dieckmann
An enantioselective C−H amidation of phosphine oxides by using an iridium(III) catalyst bearing an atropchiral cyclopentadienyl (Cpx) ligand is reported. A very strong cooperative effect between the chiral Cpx ligand and a phthaloyl tert-leucine enabled the transformation. Matched–mismatched cases of the different acid enantiomers are shown. The amidated P-chiral arylphosphine oxides are formed in yields of up to 95 % and with excellent enantioselectivities of up to 99:1 er. Enantiospecific reduction provides access to valuable P-chiral phosphorus(III) compounds. Catalytic handshake: A cooperative effect between a chiral CpxIrIII complex and chiral carboxylic acid enables highly enantioselective C−H amidations of phosphine oxides with up to 99:1 e.r. Matched–mismatched pairs have a strong influence on the reactivity and selectivity.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708440

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