反应详情

温度

45 °C

A solution of 190 ml of concentrated hydrochloric acid in 300 ml of ethanol is added dropwise to a mixture of 50 g of 4-benzyloxy-2-methyl-1-nitrobenzene and of 46 g of zinc. The solution is cooled to around 45° C. by means of an ice bath throughout the running-in process. The medium is stirred for 3 hours at ambient temperature. The pH of the solution is adjusted to around pH 8 by adding 500 ml of a saturated potassium carbonate solution. The precipitate is filtered off and washed with 5×500 ml of ethyl acetate. The organic phases are combined and washed with 2×1 liter of distilled water, then with 1 liter of a saturated sodium chloride solution. After drying over magnesium sulfate, the solvent is evaporated off under reduced pressure in a rotary evaporator. The reaction crude is purified by flash chromatography (silica 35-70 μm), eluent: ethyl acetate/cyclohexane 80:20; 75:25; 70:30. 30.81 g of 4-benzyloxy-2-methylphenylamine are isolated.

1. filtrationThe precipitate is filtered off
2. washwashed with 5×500 ml of ethyl acetate
3. washwashed with 2×1 liter of distilled water
4. dry with materialAfter drying over magnesium sulfate
5. customthe solvent is evaporated off under reduced pressure in a rotary evaporator
6. customThe reaction crude
7. customis purified by flash chromatography (silica 35-70 μm), eluent