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(S)-3-(Aminomethyl)-5-fluoro-N2-(1-(4-fluorophenyl)ethyl)-N6-(5-isopropoxy-1H-pyrazol-3-yl)pyridine-2,6-diamine (Example 18; 0.20 g, 0.49 mmol) and acetic acid loaded TFP resin (1.4 mmol/g loading, 0.49 mmol) were placed in a THF-DCM solution (1:1, 6 ml) at 0° C. The resulting solution was shaken vigorously at 0° C. for 45 min and filtered. The resulting resin was washed with a THF-DCM solution (1:1, 3×5 ml for 30 min. each). The resulting organic layers were combined and concentrated. The resulting solid was purified by reverse-phase column chromatography (5-50% CH3CN in H2O over 400 ml) to give the title compound (0.010 g, 49%). 1H NMR (400 MHz, CD3OD) δ 7.37-7.34 (m, 2H), 7.14 (d, J=10.9 Hz, 1H), 7.02-6.98 (m, 2H), 5.25 (s, 1H), 4.96-4.95 (m, 1H), 4.55-4.52 (m, 1H), 4.30 (d, J=14.8 Hz, 1H), 4.21 (d, J=14.8 Hz, 1H), 2.01 (s, 3H), 1.51 (d, J=6.8 Hz, 3H), 1.31 (d, J=6.0 Hz, 6H). MS: Calcd.: 444. Found: [M+H]+ 445.

1. filtrationfiltered
2. washThe resulting resin was washed with a THF-DCM solution (1:1, 3×5 ml for 30 min. each)
3. concentrationconcentrated
4. customThe resulting solid was purified by reverse-phase column chromatography (5-50% CH3CN in H2O over 400 ml)