反应详情

22.6 g of 3-chloro-2-(4-chloro-3-formylphenyl)-5-trifluoromethylpyridine, 6.5 g of sodium bicarbonate and 5.4 g of hydroxylamine hydrochloride in 100 ml of tetrahydrofuran were stirred at 23° C. for 24 hours. The tetrahydrofuran was then removed, after which the residue was taken up in 100 ml of methylene chloride. The solution was washed twice with 100 ml of water. The solid formed during this was removed, washed with water and dried. Concentration of the organic phase resulted in a residue which was purified by chromatography on silica gel with cyclohexane/ethyl acetate (7:3). Yield: 26.1 g (82%) of colorless crystals; melting point: 173°-174° C.

1. customThe tetrahydrofuran was then removed
2. washThe solution was washed twice with 100 ml of water
3. customThe solid formed during
4. customthis was removed
5. washwashed with water
6. customdried
7. customConcentration of the organic phase resulted in a residue which
8. customwas purified by chromatography on silica gel with cyclohexane/ethyl acetate (7:3)