反应详情

To a solution of 4-hydroxy-1-[4,5-bis(4-methylphenyl)oxazol-2-yl)butan-1-one (0.78 g) and triethylamine (2 ml) in DMSO (10 ml) was added a solution of pyridinesulfonic acid (1.16 g) in DMSO (4 ml) at room temperature. After being stirred for 20 minutes at the same temperature, the mixture was partitioned between ethyl acetate and water. The organic layer was washed with 1M-HCl, water and brine. The dried solvent was evaporated in vacuo and the residue was purified by chromatography on silica gel to give 1-[4,5-bis(4-methylphenyl)oxazol-2-yl)butan-1,4-dione (0.22 g). MS (m/z): 334 (M+ +1) IR (Nujol): 1735, 1690 cm-1NMR (CDCl3, δ): 2.38 (3H, s), 2.40 (3H, s), 2.97 (2H, t, J=6.4 Hz), 3.47 (2H, t, J=6.4 Hz), 7.17-7.26 (4H, m), 7.53-7.59 (4H, m), 9.88 (1H, s)

1. customthe mixture was partitioned between ethyl acetate and water
2. washThe organic layer was washed with 1M-HCl, water and brine
3. customThe dried solvent was evaporated in vacuo
4. customthe residue was purified by chromatography on silica gel