Dimethylformamide → 1-Methyl-1H-imidazole-4-sulfonic Acid [4-(4-amino-pyrazolo[3,4-d]pyrimidin-1-yl)-phenyl]-amide

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Title compound 11A, 1-(4-amino-phenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-ylamine (33 mg, 1.0 eq, 0.15 mmol), 1-methylimidazole sulphonylchloride (22 mg, 1.0 eq, 0.15 mmol) and diisopropylethylamine (23 μl, 0.9 eq, 0.13 mmol) were added to DMF (1 ml) and the mixture was stirred for 48 hours at room temperature under an inert atmosphere. Methanol was then added (1 ml) and the solvents were removed in vacuo. The resultant residue was purified column chromatography using DCM/MeOH (96:4) as eluen followed by trituration in methanol to yield the title compound as a white solid (6 mg, 0.03 mmol, 11%). LCMS: [M+H]+=371, Rt=1.33 min, 100% purity.

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