Enantioselective Intermolecular Benzylic C–H Amination under Chiral Paddle-Wheel Diruthenium Catalysis
Kotoko Makino, Kohei Mori, Shoichi Kiryu, Taku Miyazawa, Yuhei Kumagai, Kosuke Higashida, M. Kojima, Tatsuhiko Yoshino, Shigeki Matsunaga
Abstract
A catalytic asymmetric intermolecular benzylic C–H amination was achieved under paddle-wheel diruthenium catalysis. A chiral diruthenium catalyst incorporating ( S )-TPPTTL (tetraphenylphthaloyl-( S )- tert -leucine) ligand exhibited notable enantioselectivity, and aminated products were obtained with up to 99% ee. Unique chemoselectivity of the chiral diruthenium catalyst was also found for allylbenzene and alkyl-naphthalene substrates, demonstrating the complementary synthetic utility of chiral paddle-wheel Ru(II)–Ru(III) catalysts to Rh(II) counterparts.
Topics & Concepts
Enantioselective synthesisAminationChemistryCatalysisChemoselectivityIntermolecular forceRutheniumCombinatorial chemistryChiral ligandLigand (biochemistry)Medicinal chemistryStereochemistryOrganic chemistryMoleculeBiochemistryReceptorSynthesis and Catalytic ReactionsCatalytic C–H Functionalization MethodsAsymmetric Hydrogenation and Catalysis