Potassium Carbonate → Ethyl 3-((2-chloro-5-nitropyrimidin-4-yl)(isopropyl)amino)-2,2-difluoropropanoate

関与物質

反応条件

反応手順

Ethyl 2,2-difluoro-3-(isopropylamino)propanoate (1.50 g, 7.68 mmol) was dissolved in acetone and K2CO3 (2.12 g, 15.3 mmol) was added. The solution was purged with nitrogen gas and cooled to 0° C. A solution of 2,4-dichloro-5-nitropyrimidine (1.64 g, 8.45 mmol) in acetone (10 mL) was added dropwise at 0° C. over 1 h. The reaction mixture was allowed to slowly warm to room temperature and stirred overnight. It was diluted with dichloromethane (50 mL) and filtered thru a celite plug. The filtrate was concentrated in vacuo and the residue purified by flash column chromatography on silica gel (120 g SiO2, hexanes:ethyl acetate 10:1-3:1) to afford the title compound as a yellow oil (1.96 g, 72%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.29 (d, J=6.82 Hz, 6H) 1.34 (t, J=7.20 Hz, 3H) 3.63-3.75 (m, 1H) 4.24 (t, J=13.14 Hz, 2H) 4.34 (q, J=7.07 Hz, 2H) 8.74 (s, 1H).

情報源と証拠