Tetrahedron

Asymmetric hydrogenation of N-alkyl and N-aryl ketimines using chiral cationic Ru (diamine) complexes as catalysts: the counteranion and solvent effects, and …

F Chen, Z Ding, Y He, J Qin, T Wang, QH Fan

Index: Chen, Fei; Ding, Ziyuan; He, Yanmei; Qin, Jie; Wang, Tianli; Fan, Qing-Hua Tetrahedron, 2012 ,  vol. 68,  # 26  p. 5248 - 5257

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Citation Number: 16

Abstract

Asymmetric hydrogenation of N-alkyl and N-aryl ketimines catalyzed by chiral cationic η6- arene-(N-monosulfonylated diamine) Ru (II) complexes has been investigated. Strong counteranion and solvent effects on the enantioselectivity were observed. The ruthenium catalyst bearing non-coordinating BArF− anion was found to be particularly effective for the hydrogenation of acyclic and exocyclic N-alkyl ketimines in the presence of (Boc) 2O in ...