Scheme 4.
Reductive amination of ketoacids. Reagents and conditions: ketoacid (100 μmol), Ir1 (1.0 μmol), HCOONH4 (1.0 mmol), CH3OH (0.5 mL), 37 °C, 6 h. Reactions were performed in triplicate and the average yields are shown above. Products were quantified by 1H NMR spectroscopy using 1,3,5-trimethoxybenzene as an internal standard. Isolated yields are shown with an asterisk (*).