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54 mg (0.13 mmol) of ethyl 4,6-diamino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidinylcarbamate from Example 2 are added to 5 ml of DMF, the mixture is cooled to 0° C., and 7.67 mg (0.19 mmol) of sodium hydride are added. Then 18.14 mg (0.13 mmol) of iodomethane are added dropwise, and the mixture is stirred for one hour. The mixture is mixed with water and extracted with dichloromethane. The combined organic phases are dried over magnesium sulphate and concentrated in a rotary evaporator. The residue is purified first by column chromatography (mobile phase: dichloromethane/methanol=10:1) and then by preparative RP-HPLC.

1. extractionextracted with dichloromethane
2. dry with materialThe combined organic phases are dried over magnesium sulphate
3. concentrationconcentrated in a rotary evaporator
4. customThe residue is purified first by column chromatography (mobile phase: dichloromethane/methanol=10:1)