A solution of 114 mg (0.3 mmol) of 4-(3-(2,6-dimethylphenylamino)-6-(phenylamino)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)butane-1,2-diol 34 (Example 2) in 10 mL of acetone and 7 mL of water was treated with 585 mg (2.7 mmol) of NaIO4. The resulting tan slurry was stirred at room temperature for 6 h. The reaction mixture was diluted with CH2Cl2, filtered, and the filtrate was concentrated. The residue was dissolved in CH2Cl2 (75 mL) and washed with water (50 mL). The aqueous layer was extracted with more CH2Cl2 (2×75 mL). The combined organic layers were dried over Na2SO4 and filtered, and the filtrate was concentrated to give the title compound 36, which was used without further purification. 1H-NMR (CDCl3) δ 2.27 (s, 6H), 3.05 (t, J=6.7 Hz, 2H), 4.52 (t, J=6.7 Hz, 2H), 5.30 (s, 1H), 5.89 (s, 1H), 7.06 (t, J=7.6 Hz, 1H), 7.13-7.19 (m, 3H), 7.34 (t, J=7.7 Hz, 2H), 7.42 (s, 1H), 7.64 (d, J=7.7 Hz, 2H), 9.89 (s, 1H). Mass Spectrum (ESI) m/e=387.2 (M+1).
