Water → tert-butyl 4-[2-[2-(difluoromethyl)-4-methoxy-1H-benzimidazol-1-yl]-6-(4-morpholinyl)-9H-purin-9-yl]-1-piperidinecarboxylate

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A mixture of tert-butyl 4-{[5-amino-2-[2-(difluoromethyl)-4-methoxy-1H-benzimidazol-1-yl]-6-(4-morpholinyl)-4-pyrimidinyl]amino}-1-piperidinecarboxylate (Example 96) (250 mg, 0.435 mmol), trimethylorthoformate (5 mL), and p-TSOH.H2O (8.3 mg, 0.0436 mmol) was heated at 95-100° C. for 3 hrs. The mixture was cooled to room temperature and the solvent was removed under vacuum. Chromatography on silica, eluting with CH2Cl2/MeOH (100:0 to 99:1), gave tert-butyl 4-[2-[2-(difluoromethyl)-4-methoxy-1H-benzimidazol-1-yl]-6-(4-morpholinyl)-9H-purin-9-yl]-1-piperidinecarboxylate (193 mg, 76%): mp (CH2Cl2/MeOH) 213-215° C.; 1H NMR (CDCl3) δ 7.82 (s, 1H), 7.79 (d, J=8.3 Hz, 1H), 7.44 (t, JHF=53.6 Hz, 1H), 7.35 (t, J=8.2 Hz, 1H), 6.81 (d, J=7.9 Hz, 1H), 4.57 (tt, J=12.0, 4.0 Hz, 1H), 4.38 (m, 6H), 4.06 (s, 3H), 3.88 (t, J=4.9 Hz, 4H), 2.95 (t, J=12.6 Hz, 2H), 2.19 (dd, J=12.1, 2.0 Hz, 2H), 2.05 (dq, J=12.3, 4.2 Hz, 2H), 1.49 (s, 9H); Anal. Calcd. for C28H34F2N8O4: C, 57.5; H, 5.9; N, 19.2. Found: C, 57.3; H, 5.8; N, 19.1%.

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