2-Butenoic acid, 3-(acetylamino)-, methyl ester, (2Z)- → 3-(3-fluoro-4-(hexylamino)phenyl)-2,6-dimethylpyrimidin-4(3H)-one

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Reaction Steps

To a solution of 2-fluoro-N1-hexylbenzene-1,4-diamine (3.36 g, 16 mmol) in CH2Cl2 (20 mL) was added trimethylaluminium (40 mL, 80 mmol, 2 M in toluene) slowly. The mixture was stirred at rt for 0.5 h, followed by the addition of a solution of methyl 3-acetaminocrotonate (3.02 g, 19.2 mmol) in CH2Cl2 (5 mL). The reaction mixture was stirred at rt for 72 h, then quenched with saturated NH4Cl aqueous solution and extracted with CH2Cl2 (150 mL×3). The combined organic phases were washed with brine, dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was purified by a silica gel column chromatography (PE/EtOAc (V/V)=4:1) to give the title compound as pale yellow oil (1.57 g, 31%). The compound was characterized by the following spectroscopic data:

Provenance & Evidence