反应详情

温度

70 °C

To a stirred solution of (1-methyl-1H-tetrazol-5-yl)[3-(trifluoromethoxy)phenyl]methanone (5.12 g, 16.2 mmol) in dry pyridine (25 mL) was added hydroxylamine hydrochloride (2.81 g, 40.4 mmol). The mixture was stirred at 70° C. for 3 h, then left to stand overnight. After concentration of the reaction mixture in vacuo, the residue was diluted with ethyl acetate (100 mL) and washed with water (50 mL). The aqueous layer was extracted with ethyl acetate (50 mL), the combined organic layers dried (MgSO4), concentrated in vacuo and dissolved in toluene. A crystalline precipitate appeared, which was filtered off to afford N-hydroxy-1-(1-methyl-1H-tetrazol-5-yl)-1-[3-(trifluoromethoxy)phenyl]methanimine as a white solid [4.33 g, yield 92%; HPLC/MS:m/z=288 (M+H); log P(HCOOH)=2.37].

1. waitleft
2. waitto stand overnight
3. washwashed with water (50 mL)
4. extractionThe aqueous layer was extracted with ethyl acetate (50 mL)
5. dry with materialthe combined organic layers dried (MgSO4)
6. concentrationconcentrated in vacuo
7. dissolutiondissolved in toluene
8. filtrationwhich was filtered off