反应详情

温度

22 °C

To a solution of α-trifluoromethyl lactic acid (0.37 g) in dry tetrahydrofuran (10 ml) at 22° C. was added carbonyldiimidazole (0.38 g) in one portion. The mixture was stirred for 30 minutes, then treated with 4-(N,N-diethylaminosulfonyl)aniline (0.53 g) and stirred at 22° C. for 1 hour followed by heating at reflux for 18 hours. After cooling to 22° C., the mixture was concentrated to an oil which was purified by chromatography (9:1 CH2Cl2 : diethyl ether) and crystallization from hexane to produce the title compound as a colourless crystalline solid (0.15 g); mp 115°-130° C.; MS: m/z=341(M+1); NMR (250 MHz, CDCl3): 1.12 (t,6), 1.78 (s,3), 3.22 (s,4), 3.73 (s,1), 7.67-7.79 (m,4), 8.62(broad s,1). Analysis for C14H19F3N2O4S: Calculated: C, 45.64; H, 5.19; N, 7.61; Found: C, 45.74; H, 5.22; N, 7.66.

1. stirringstirred at 22° C. for 1 hour
2. temperatureby heating
3. temperatureat reflux for 18 hours
4. concentrationthe mixture was concentrated to an oil which
5. customwas purified by chromatography (9:1 CH2Cl2 : diethyl ether) and crystallization from hexane