(S)-3-[4-(2-amino-6-{1-[2-(6-cyanopyridin-3-yl)-phenyl]-2,2,2-trifluoro-ethoxy}-pyrimidin-4-yl)-phenyl]-2-tert-butoxycarbonylamino-propionic acid → (S)-2-amino-3[4-(2-amino-6-{1-[2-(6-cyano-pyridin-3-yl)-phenyl]-2,2,2-trifluoro-ethoxy}-pyrimidin-4-yl)-phenyl]-propionic acid

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80 mg of (S)-3-[4-(2-amino-6-{1-[2-(6-cyanopyridin-3-yl)-phenyl]-2,2,2-trifluoro-ethoxy}-pyrimidin-4-yl)-phenyl]-2-tert-butoxycarbonylamino-propionic acid was dissolved in the solution of 30% trifluoro acetic acid in dichloromethane (5 ml). The mixture was stirred at room temperature for 1 hour. The solvent was evaporated and the residue was purified by preparative HPLC to give 12.6 mg of (S)-2-amino-3[4-(2-amino-6-{1-[2-(6-cyano-pyridin-3-yl)-phenyl]-2,2,2-trifluoro-ethoxy}-pyrimidin-4-yl)-phenyl]-propionic acid. 1H NMR (400 MHz, CD3OD) δ (ppm) 8.86 (s, 1H), 8.17 (d, J=2 Hz, 1H), 8.15 (d, J=2 Hz, 1H), 7.96 (m, 2H), 7.59 (m, 1H), 7.36 (m, 3H), 6.7 (s, 1H), 6.65 (d, J=6.8 Hz, 1H), 4.25 (m, 1H), 3.47 (m, 1H), 3.23 (m, 1H).

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