反应详情

温度

80 °C

A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA(5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (μ, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1

1. temperatureAfter cooling
2. extractionthe mixture extracted with MTBE
3. washThe organic extracts were washed with water
4. dry with materialdried over sodium sulfate
5. filtrationFiltration and evaporation under vacuum