Sodium hydride → 7-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-3-(2,2,2-trifluoroethyl)pyrimido[4,5-d]pyrimidine-2,4(1H,3H)-dione

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Reaction Steps

50 mg (0.11 mmol) of 4-amino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-N-(2,2,2-trifluoroethyl)pyrimidine-5-carboxamide (example 103A) were initially charged in 5 ml of THF and, while cooling with ice, 18.0 mg (0.45 mmol) of sodium hydride (60% in mineral oil) were added over a period of 5 min. The mixture was stirred for 25 min, then 27.3 mg (0.17 mmol) of 1,1′-carbonyldiimidazole were added with ice cooling over 5 min. Conversion was effected at room temperature for 1 h and at reflux temperature for 90 min. After cooling, the mixture was hydrolyzed and then the organic phase was diluted with 10 ml of THF. After drying with sodium sulfate, the volatile components were removed by means of a rotary evaporator. Then the crude material was purified by means of preparative HPLC [column: Reprosil C18, 10 μm, 250*30 mm; flow rate: 40 ml/min; eluent: methanol/0.05% formic acid; gradient: 50% methanol→95% methanol)]. The volatile components of the product fractions were removed on the rotary evaporator. Thus, 26 mg (48% of theory) of the target compound were obtained.

Provenance & Evidence