Methyl pivaloylacetate → 6-tert-Butyl-2-(2-trifluoromethyl-phenyl)-3H-pyrimidin-4-one

Beteiligte Stoffe

Reaktionsschritte

A mixture of 2-trifluoromethylbenzamidine (1.12 g, 5 mmol), sodium ethoxide (1.02 g, 15 mmol) and 4,4-dimethyl-3-oxo-pentanoic acid methyl ester (0.80 mL, 5 mmol) in ethanol (50 mL) and was heated at reflux for 16 hours. The reaction was cooled, concentrated, diluted with water and acidified with 2 N hydrochloric acid. This solution was extracted with ethyl acetate, dried over sodium sulfate and concentrated. Purification by flash chromatography [SiO2, methanol:dichloromethane (2:98)] provided the title compound (0.48 g, 32% yield) as a yellow solid; 1H-NMR (500 MHz, DMSO-d6) δ 12.8 (br s, 1H), 7.89 (d, J=7.5 Hz, 1H), 7.78 (m, 2H), 7.71 (d, J=7.4 Hz, 1H), 6.24 (s, 1H), 1.20 (s, 9H) ppm; LC-MS 297.03 (M+H); Rt (Method A) 3.30 minutes.

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