A solution of 6-[cyclohexyl(cyclopropylmethyl)amino]-N-(4-formylphenyl)pyrimidine-4-carboxamide (Intermediate 24, 80 mg; 0.18 mmol) in DCM (8 ml) was treated with Glycine tert-butyl ester hydrochloride (Sachem, 60.6 mg; 0.36 mmol) and triethylamine (50 μl; 0.36 mmol). After 2 minutes sodium triacetoxyborohydride (96 mg; 0.45 mmol) and acetic acid (2 μl; 0.04 mmol) were added and the reaction was stirred at room temperature for 20 hours. The solvent was removed under vacuum and the residue was redissolved in AcOEt. The organic phase was washed twice with an aqueous solution (1N) of NaOH and once with brine, dried (MgSO4) and the solvent removed under vacuum to afford the title compound as a colorless oil (62.7 mg, 70%) after purification by column chromatography (silica) eluting with cyclohexane containing increasing amounts of EtOAc.
