反应详情

A solution of 4-(4-fluorotetrahydro-2H-pyran-4-yl)benzonitrile (Step 1, 180 mg, 0.877 mmol), hydroxylamine hydrochloride (134 mg, 1.93 mmol) and triethylamine (196 mg, 1.93 mmol) in ethanol (4.5 mL) was stirred and heated at reflux for 4 h. After being cooled to rt, the reaction mixture was diluted with water (100 mL) and extracted with ethyl acetate. The organic extract was successively washed with brine and dried over anhydrous magnesium sulfate. After filtration and evaporation of the solvent, the title compound was obtained (201 mg, 76%): 1H NMR (500 MHz, DMSO-d6) δ 9.64 (s, 1H), 7.70 (d, 2H), 7.44 (d, 2H), 5.81 (s, 2H), 3.88-3.83 (m, 2H), 3.73-3.67 (m, 2H), 2.23-2.06 (m, 2H), 1.87-1.81 (m, 2H); DCI(NH3)-MS m/z 239 (MH)+; HPLC RT (Method I) 3.13 min.

1. temperatureheated
2. temperatureat reflux for 4 h
3. extractionextracted with ethyl acetate
4. extractionThe organic extract
5. washwas successively washed with brine
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationAfter filtration and evaporation of the solvent