Sodium hydride → 5-(3-{3,5-difluoro-4-[3-(4-methylpiperazin-1-yl)propoxy]-phenyl}-6-oxo-6H-pyridazin-1-ylmethyl)-1,3-dihydrobenzimidazol-2-one

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Reaction Steps

170 mg (1.08 mmol) of 3-(4-methylpiperazin-1-yl)propan-1-ol are dissolved in 20 ml of DMF, 64.5 mg (1.61 mmol) of NaH in paraffin oil (60%) are added under nitrogen, and the mixture is stirred at room temperature. After 10 min, 200 mg (0.54 mmol) of 5-[6-oxo-3-(3,4,5-tri-fluorophenyl)-6H-pyridazin-1-ylmethyl]-1,3-dihydrobenzimidazol-2-one are added, and the mixture is stirred at room temperature under a nitrogen atmosphere. The reaction is monitored by means of HPLC. After 3 h, the reaction is terminated. The mixture is neutralised using 1N HCl. The mixture is evaporated to dryness, the residue is dissolved in 100 ml of ethyl acetate and 30 ml of water, the aqueous phase is separated off and neutralised using sodium hydrogencarbonate and subsequently extracted. A precipitate deposits in the process and is separated off. The residue is stirred with methanol, filtered off with suction and dried in vacuo.

Provenance & Evidence