Reaction Steps
To a stirred solution of 2-fluoro-9-isopropyl-6-[(pyridin-3-ylmethyl)-amino]purine (300 mg, 1.05 mmol) in n-BuOH/DMSO (5 ml, 4:1) at room temperature under an argon atmosphere was added DIEA (2 ml, 10 eq, 10.5 mmol) followed by (R)-1-aminopropan-2-ol (395 mg, 5.25 mmol). The flask was fitted with a condenser and the reaction mixture was placed in a preheated oil bath at 140° C. and stirred at this temperature for 72 h. The reaction mixture was allowed to cool to room temperature and the solvent was evaporated in vacuo. The residue was partitioned between ethyl acetate (50 mL) and water (50 mL), the aqueous phase was extracted with more ethyl acetate (2×25 mL), and the combined organic phase was washed with brine (50 mL), dried (MgSO4) and evaporated in vacuo. The residue was purified by gradient flash column chromatography on silica gel eluted with CHCl3:MeOH (100:0→95:5), to afford the pure product as a colorless oil (38 mg, 10.6%). δH (250 MHz, CDCl3) 1.15 (3 H, d, J 7.5, CHCH3OH), 1.45 (6 H, d, J 7.5, CH[CH3]2), 3.3-3.2 (1 H, m, NHCHHCHMeOH)), 3.45-3.36 (1 H, m, NHCHHCHMeOH), 3.96-3.9 (1 H, m, CHMe2), 4.58-4.47 (1 H, m, CHMeOH), 4.69 (2 H, d, J 5, NHCH2Ar), 5.23 (1 H, t, J 5, NHCH2CHMeOH), 6.32 (1 H, s, br, NHCH2Ar), 7.16-7.11 (1 H, m, ArH), 7.4 (1 H, s, ArH), 7.6 (1 H, d, J 7.5, ArH), 8.4 (1 H.d, J 2.5, ArH), 8.55 (1 H, s, ArH); δC (250 MHz, CDCl3) 160.07 (C), 154.95 (C), 154.7 (C), 151.1 (C), 149.27 (CH), 148.54 (CH), 135.3 (CH), 134.73 (CH), 123.39 (CH), 114.61 (C), 68.83 (CH), 50.09 (CH2), 46.49 (CH), 41.95 (CH2), 22.49 (2×CH3), 20.85 (CH3); m/z 342.2 (M+H)
