Hydrochloric Acid → 2-{6-[2-(Dimethylamino)ethoxy]pyrimidin-4-yl}-4-pyridin-3-yl-1,2-dihydro-3H-pyrazol-3-one hydrochloride

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Reaction Steps

99 mg (0.4 mmol, 60% in mineral oil) of sodium hydride are added to a solution of 35 μl (31 mg, 0.4 mmol) of N,N-dimethylethanolamine and 2 ml of anhydrous THF, and the mixture is stirred for 10 min 100 mg (0.4 mmol) of the compound from Example 23, suspended in 3 ml of anhydrous THF, and 6 mg (0.02 mmol) of tetra-n-butylammonium iodide are added, and the mixture is stirred at RT for 16 h. 1 N hydrochloric acid and water are then added, the mixture is concentrated on a rotary evaporator and the residue is stirred in methanol. The precipitated solid is filtered off, and the filtrate is concentrated under reduced pressure. The filter residue is stirred in diethyl ether, the precipitate is filtered off and the filter residue is purified further by preparative HPLC (RP18 column; mobile phase: acetonitrile/water gradient with addition of 0.1% formic acid). The resulting formate salt of the target compound is converted into the hydrochloride by addition of 2 ml 1 M hydrochloric acid and reconcentration.

Provenance & Evidence