[Br:1][C:2]1[C:10]2[C:5](=[N:6][C:7](SC)=[N:8][CH:9]=2)[NH:4][N:3]=1.ClC1C=C(C=CC=1)C(OO)=O.[CH2:24]([NH2:27])[CH2:25][CH3:26]>C1COCC1>[Br:1][C:2]1[C:10]2[C:5](=[N:6][C:7]([NH:27][CH2:24][CH2:25][CH3:26])=[N:8][CH:9]=2)[NH:4][N:3]=1To a mixture of 3-bromo-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine (0.49 g, 2.0 mmol) in THF (5 mL) was added meta-chloroperoxybenzoic acid (0.52 g, 99%, 3 mmol) at room temperature. The white mixture was stirred for 2 h and n-propylamine (0.82 mL, 10 mmol) was added at 0° C. The resulting solution was heated at 40° C. for 12 h. After removal of the solvent, MeOH was added and the mixture was filtered. The white solid was washed with MeOH (3×) and dried to provide 3-bromo-N-propyl-1H-pyrazolo[3,4-d]pyrimidin-6-amine (0.45 g, 88%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 13.19 (bs, 1H), 8.63 (s, 1H), 7.69 (bs, 1H), 3.29-3.17 (m, 2H), 1.61-1.49 (m, 2H), 0.88 (t, J=7.4 Hz, 3H); 13C NMR (100 MHz, DMSO-d6) δ 161.61, 156.98, 152.71, 120.06, 106.66, 42.68, 21.72, 11.47; MS m/z 256.1 [M+1].
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