Triethylamine → 6-(3-fluoro-pyridin-4-yl)-3-methyl-2-((3S)-3-(4-piperidin-1-yl-phenyl)-piperazin-1-yl)-3H-pyrimidin-4-one trihydrochloride

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Reaction Steps

A solution of (2S)-2-(4-piperidin-1-yl-phenyl)-piperazine trihydrochloride obtained in Reference Example 3 (199 mg, 0.561 mmol) and triethylamine (427 μl, 306 mmol) in tetrahydrofuran was refluxed for 15 minutes. After cooling to room temperature, 2-chloro-6-(3-fluoropyridin-4-yl)-3-methyl-3H-pyrimidin-4-one (122 mg, 0.510 mmol) was added portionwise and the mixture was stirred overnight. The reaction mixture was concentrated in vacuo and the residue was dissolved in dichloromethane and aqueous sodium bicarbonate, and the solution was passed through CHEM ELUT CE1010 (manufactured by VARIAN). The filtrate was concentrated, and the resulting residue was washed with diethyl ether. Hydrogen chloride in ethyl acetate (4N) was added to a solution of the resulting solids in ethyl acetate, and the precipitate was collected by the filtration and dried to furnish 6-(3-fluoro-pyridin-4-yl)-3-methyl-2-((3S)-3-(4-piperidin-1-yl-phenyl)-piperazin-1-yl)-3H-pyrimidin-4-one trihydrochloride (267 mg, 0.479 mmol, 94%) as pale yellow powder.

Provenance & Evidence