反应详情

A mixture of 1-hydroxy-4-methyl-1-(3-nitrophenyl)pentan-3-one (3.32 g), p-toluenesulfonic acid monohydrate (0.03 g) and toluene (50 mL) was refluxed for 1 hour under Dean-Stark conditions. The mixture was diluted with ethyl acetate, washed (sat. sodium bicarbonate, water and brine) and the solvent removed. Chromatography (hexane/ethyl acetate, 3:1) yielded 4-methyl-1-(3-nitrophenyl)-1-penten-3-one (2.98 g) as a yellow solid. NMR: 1.11 (d,6, J=6.8, CH3), 3.02 (m,1, CH), 7.27 (d,1, J=16.2, CH), 7.73 (m,2, CH,Ar), 8.24 (m,2, Ar), 8.61 (m,1, Ar), MS: m/z=219(M).

1. temperaturewas refluxed for 1 hour under Dean-Stark conditions
2. washwashed (sat. sodium bicarbonate, water and brine)
3. customthe solvent removed