General procedure for the transfer hydrogenation of ketimines

catalyst (20 mol %), Hantzsch dihydropyridine (1.4 equiv) and benzene were added to a screw-capped vial and the mixture was exposed to an argon atmosphere. The resulting yellow solution was allowed to stir at 60 °C for 3 days or until the solution became colourless. The solvent was evaporated in vacuo, and the residue was purified by column chromatography to afford the corresponding amine. 

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