反应详情

To a solution of 1,3-dimethyl-1H-pyrazol-4-methanol (0.33 g, 2.63 mmol), N-methyl morpholine N-oxide (0.37 g, 3.16 mmol), and crushed, dried, and activated 4 Å sieves (1.5 g) in anhydrous dichloromethane (20 ml), is added tetrapropyl ammonium peruthenate (0.09 g, 0.26 mmol). The reaction mixture is stirred for one hour at room temperature, then filtered through a silica gel plug and eluted with ethyl acetate. The filtrate is concentrated in vacuo to give 1,3-dimethyl-1H-pyrazole-4-carboxaldehyde (0.26 g, 81%) which is used without further purification. 1H NMR (CDCl3): δ=9.83 (1H, s), 7.78 (1H, s), 3.86 (3H, s), 2.46 (3H, s).

1. customdried
2. filtrationfiltered through a silica gel plug
3. washeluted with ethyl acetate
4. concentrationThe filtrate is concentrated in vacuo