N-methyl-2-pyrrolidone → 1-{6-[2-(2,4-Dichloro-phenyl)-ethylamino]-2-methoxy-pyrimidin-4-yl}-piperidine-4-carboxylic acid methyl ester

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In a tube is combined 1-(6-chloro-2-methoxy-pyrimidin-4-yl)-piperidine-4-carboxylic acid methyl ester [103 mg, 0.36 mmol], 2-(2,4-dichloro-phenyl)-ethylamine (0.163 mL, 1.08 mmol), sodium bicarbonate (181 mg, 2.16 mmol) and N-methylpyrrolidinone (2 mL). The mixture is heated at 140° C. for 12 h. Additional 2-(2,4-dichloro-phenyl)-ethylamine (0.2 mL, 1.33 mmol) is added and heating at 140° C. is continued for another 12 h. The mixture is diluted with water (30 mL) and extracted twice with EtOAc (30 mL). The organic extracts are washed twice with water (40 mL) and once with brine (30 mL), combined, dried over magnesium sulfate, filtered and concentrated. The residue is subjected to chromatography on silica gel eluting with 40% ethyl acetate:heptane to afford 1-{6-[2-(2,4-dichloro-phenyl)-ethylamino]-2-methoxy-pyrimidin-4-yl}-piperidine-4-carboxylic acid methyl ester [70 mg, 44%] as a solid.

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