[F:1][C:2]1[CH:20]=[CH:19][CH:18]=[CH:17][C:3]=1[CH2:4][N:5]1[C:9]2=[N:10][CH:11]=[N:12][CH:13]=[C:8]2[C:7]([C:14](=[NH:16])[NH2:15])=[N:6]1.C([N:23](CC)CC)C.O.NN>C(O)C>[F:1][C:2]1[CH:20]=[CH:19][CH:18]=[CH:17][C:3]=1[CH2:4][N:5]1[C:9]2=[N:10][CH:11]=[N:12][CH:13]=[C:8]2[C:7]([C:14](=[NH:15])[NH:16][NH2:23])=[N:6]1610 mg (approx. 1.92 mmol, purity 86%) of 1-(2-fluorobenzyl)-1H-pyrazolo[3,4-d]pyrimidine-3-carboximidamide were initially charged in 10 ml of ethanol and cooled to 0° C. 777 mg (7.68 mmol) of triethylamine and 120 mg (1.920 mmol) of 80% hydrazine hydrate were added, and the mixture was stirred at room temperature for 18 h. The mixture was concentrated on a rotary evaporator, taken up in ethyl acetate and washed three times with saturated aqueous sodium chloride solution. The organic phase was dried over sodium sulphate, concentrated on a rotary evaporator and dried under high vacuum. 590 mg (purity 89%, 95% of theory) of the target compound were obtained.
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