Asymmetric Hydrogenation of 2-and 2,3-Substituted Quinoxalines with Chiral Cationic Ruthenium Diamine Catalysts

[摘要]：The enantioselective hydrogenation of 2-alkyl- and 2-aryl-subsituted quinoxalines and 2,3-disubstituted quinoxalines was developed by using the cationic Ru(eta(6)-cymene)(monosulfonylated diamine)(BArF) system in high yields with up to 99% ee. The counteranion was found to be critically important for the high enantioselectivity and/or diastereoselectivity.

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