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A mixture of 3-[4-(3-dimethylamino-pyrrolidin-1-yl)-phenyl]-6-hydroxymethyl-3H-thieno[3,2-d]pyrimidin-4-one (20.0 mg) and potassium-tert.-butoxide (7.65 mg) in DMF (0.3 mL) was stirred at 0° C. for 5 min. Then cyclopropylmethylbromide (11.28 mg) was added. The solution was warmed to room temperature and stirred for 2 h. Then ethyl acetate and water were added. The aqueous phase was extracted several times with ethyl acetate, the combined organic phases dried over sodium sulfate and the solvent removed in vacuo. The crude product was purified by preparative HPLC. The product with the molecular weight of 424.56 (C23H28N4O2S) was obtained in this way; MS (ESI): 425 (M+H+).

1. temperatureThe solution was warmed to room temperature
2. stirringstirred for 2 h
3. extractionThe aqueous phase was extracted several times with ethyl acetate
4. dry with materialthe combined organic phases dried over sodium sulfate
5. customthe solvent removed in vacuo
6. customThe crude product was purified by preparative HPLC
7. customThe product with the molecular weight of 424.56 (C23H28N4O2S) was obtained in this way