反应详情

温度

70 °C

A suspension of 4-[4-(4-acetylphenyl)-2-oxopyridin-1(2H)-yl]-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide (105 mg, 0.258 mmol), O-methylhydroxylamine hydrochloride (86.2 mg, 1.03 mmol) and sodium acetate (107 mg, 1.03 mmol) in ethanol (10 mL, 0.025M) was heated in an oil bath at 70° C. for 3 hours. The volatiles were removed by rotary evaporation. The remaining material was redissolved in 1.5 mL DMSO and run on Shimadzu HPLC 30×100 mm reverse phase column. The material was eluted with 20-35% acetonitrile in water with 0.1% ammonium hydroxide modifier. The gradient was run for 8 min then held at 35% for an additional two minutes. The desired material eluted at about 30% acetonitrile. This solution was concentrated down by rotary evaporation yielding 90.7 mg (80.7%) of the title compound a white solid. LC/MS m/z 436 (M+1). 1H NMR (500 MHz, DMSO-d6) δ ppm 1.57 (s, 3 H) 2.13-2.21 (m, 1 H) 2.21 (s, 3 H) 2.39-2.48 (m, 1 H) 3.11 (s, 3 H) 3.70-3.81 (m, 1 H) 3.94 (s, 3 H) 4.12 (td, J=11.90, 5.00 Hz, 1 H) 6.68 (dd, J=7.20, 1.83 Hz, 1 H) 6.75 (d, J=1.95 Hz, 1 H) 7.71-7.82 (m, 5 H) 9.27 (br. s., 1 H) 11.14 (br. s., 1 H)

1. customThe volatiles were removed by rotary evaporation
2. dissolutionThe remaining material was redissolved in 1.5 mL DMSO
3. washThe material was eluted with 20-35% acetonitrile in water with 0.1% ammonium hydroxide modifier
4. waitthen held at 35% for an additional two minutes
5. washThe desired material eluted at about 30% acetonitrile
6. concentrationThis solution was concentrated down by rotary evaporation