反应详情

温度

0 °C

To the solution of ethyl 4-methyl-2-(2-oxoimidazolidin-1-yl)thiazole-5-carboxylate (0.35 g, 1.37 mmol) and (5-(difluoromethyl)furan-2-yl)methanol (0.20 g, 1.37 mmol) in anhydrous tetrahydrofuran (10 mL) was added dropwise tributhylphosphine (0.51 mL, 2.06 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 10 minutes and followed by the addition of 1,1′-azobis(N,N-dimethylformamide) (0.35 g, 2.06 mmol). The reaction mixture was stirred at ambient temperature for 18 hours, quenched with saturated aqueous ammonium chloride solution and extracted with ethyl acetate (4×20 mL). The organic solutions were combined, dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The residue was purified by column chromatography eluted with ethyl acetate/hexane (¼) to afford the title compound as a white solid in 53% yield (0.25 g): 1H NMR (300 MHz, CDCl3) δ 6.60-6.50 (m, 1H), 6.52 (t, JH-F=54.2 Hz, 1H), 6.37-6.29 (m, 1H), 4.45 (s, 2H), 4.21 (q, J=7.1 Hz, 2H), 4.09-3.98 (m, 2H), 3.60-3.49 (m, 2H), 2.54 (s, 3H), 1.27 (t, J=7.1 Hz, 3H); MS (ES+) m/z 386.3 (M+1).

1. stirringThe reaction mixture was stirred at ambient temperature for 18 hours
2. customquenched with saturated aqueous ammonium chloride solution
3. extractionextracted with ethyl acetate (4×20 mL)
4. dry with materialdried over anhydrous sodium sulphate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography
8. washeluted with ethyl acetate/hexane (¼)