The material from step 1 was dissolved in dichloromethane and 1 mL of trifluoroacetic acid was added. The resulting mixture was left at room temperature for 6 h. The solvent was then completely evaporated and the residue dissolved in dichloromethane. 0.5 mL (450 mg, 7.5 mmol) of ethylene diamine was added. After 2 h at room temperature the mixture was evaporated and the crude purified by mass-triggered reverse-phase HPLC to afford 52 mg (0.12 mmol, 14%) of {3-[3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-phenyl}-(3-methyl-pyridin-2-yl)-methanol as an off-white solid. 1H-NMR (500 MHz, DMSO-d6) a 8.80 (d, 1H), 8.42 (d(d), 1H), 8.27 (d, 1H), 7.71 ((t), br. 1H), 7.68 (dd, 1H), 7.62 (d(m), 1H), 7.57 (d(m), 1H), 7.47 (dd(d), 1H), 7.43 (t, 1H), 7.34 (d(m), 1H), 7.26-7.23 (m, 2H), 7.10 (ddd, 1H), 5.99 (s, 1H), 3.84 (s, 3H), 2.27 (s, 3H) (exchangeable protons not visible in 1H-NMR); MS: m/z 423.2 (M+H+).
