反应详情

温度

70 °C

To a solution of 6-(3-hydroxy-propoxy)-thionicotinamide (Example 72, 8.8 g, 41.46 mmol) in EtOH (205 mL) at rt was added 1-bromo-2-butanone. The reaction mixture was then heated at 70° C. for 3 h. Upon completion, triethylamine was added and the volatiles were removed under reduced pressure. The crude material was suspended in CH2Cl2 and purified by flash chromatography. The column was eluted with a mixture of EtOAc/hexanes (30 to 50% EtOAc) to give the title compound as a white solid (10.04 g, 91%) after concentration of the chromatography fractions. 1H NMR (400 MHz, acetone-d6) δ 8.70 (s, 1H), 8.19 (dd, 1H), 7.15 (s, 1H), 6.86 (d, 1H), 4.48 (t, 2H), 3.74-3.71 (m, 3H), 2.83 (q, 2H), 2.01-1.98 (m, 2H), 1.32 (t, 3H). LC/MS m/z 265.3 (M+H)+; RT 2.12 min.

1. customthe volatiles were removed under reduced pressure
2. custompurified by flash chromatography
3. washThe column was eluted with a mixture of EtOAc/hexanes (30 to 50% EtOAc)