反应详情

温度

80 °C

To a stirred suspension of N-(2-cyano-3-fluoro-phenyl)-N-methyl-methanesulfonamide (0.685 g, 3.0 mmol) and N-methylhydroxylamine hydrochloride (1.0 g, 12 mmol) in 1:1 water/ethanol (20 mL) was added sodium carbonate (0.936 g, 6 mmol) in small portions and the resulting mixture stirred at 80° C. for 4 h. The reaction mixture was concentrated and the residue re-dissolved into 1:1 water :ethanol (20 mL). To this solution was added diethyl acetylenedicarboxylate (0.64 mL, 4 mmol) and the mixture stirred for 1 h at room temperature. The reaction mixture was then taken up in ethyl acetate (100 mL), washed successively with water and brine (50 mL each), dried (MgSO4), filtered and concentrated to give a yellow oil. The crude product was purified on silica gel column (2:3 to 3:2 ethyl acetate/hexanes) to afford the title compound as a viscous yellow oil (0.7453 g, 56% yield). 1HNMR (500 MHz, CDCl3) δ: 7.52–7.48 (1H, m), 7.31 (1H, d, J=8.24 Hz), 7.18 (1H, t, J=8.55 Hz), 4.35–4.25 (2H, m), 4.18 (2H, q, J=7.02 Hz), 3.40 (1H, d, J=16.48 Hz), 3.21 (3H, s), 3.09 (1H, d, J=16.48 Hz), 3.09 (3H, s), 3.07 (3H, s), 1.33 (3H, t, J=7.02 Hz), 1.26 (3H, t, J=7.02 Hz). HRMS (ESI) calcd for C18H25FN3O7S (M+H): 446.1397; found: 446.1383.

1. concentrationThe reaction mixture was concentrated
2. dissolutionthe residue re-dissolved into 1:1 water
3. stirringthe mixture stirred for 1 h at room temperature
4. washwashed successively with water and brine (50 mL each)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a yellow oil
9. customThe crude product was purified on silica gel column (2:3 to 3:2 ethyl acetate/hexanes)