反应详情

A solution of (3-bromo-4-methoxyphenyl)[3-chloro-5-(trifluoromethyl)pyridin-2-yl]methanone (8.90 g, 22.5 mmol) and hydroxylamine hydrochloride (3.92 g, 56.3 mmol) in pyridine (60 mL) was stirred 2 h at 50° C. then overnight at room temperature. After removal of the solvent in vacuo, addition of water (50 mL) and extraction with ethyl acetate (3×40 mL), the combined organic layers were dried over MgSO4 and concentrated in vacuo. The residue was purified on silica gel to afford 1-(3-bromo-4-methoxyphenyl)-1-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]-N-hydroxymethanimine [9.00 g, yield 88%; HPLC/MS: m/z=410 (M+H); log P(HCOOH)=3.37].

1. customovernight
2. customat room temperature
3. customAfter removal of the solvent
4. additionin vacuo, addition of water (50 mL) and extraction with ethyl acetate (3×40 mL)
5. dry with materialthe combined organic layers were dried over MgSO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified on silica gel