反应详情

Trifluoromethyl sulphonic anhydride (3.88 ml) was added dropwise over a period of 10 minutes to a stirred solution of 2-hydroxy-5-(2-methoxyethoxy)benzaldehyde (4.11 g) and 2,6-dimethylpyridine (2.67 ml) in dichloromethane (20 ml) at 0° C. under an atmosphere of argon. After stirring at room temperature for 16 hours, the mixture was added to ice (100 g). The organic phase was separated, washed with 5% aqueous sodium carbonate solution (2×10 ml), dried (MgSO4) and evaporated to give an oil which was purified by flash column chromatography on silica gel using dichloromethane as eluent to give 2-trifluoromethylsulphonyloxy-5-(2-methoxyethoxy)benzaldehyde (2.2 g) as an oil; NMR(CDCl3): 3.45(3H,s), 3.78(2H,m), 4.19(2H,m), 7.3(2H,m), 7.48(1H,d) and 10.23(1H,d); m/z 329(M+H).

1. customThe organic phase was separated
2. washwashed with 5% aqueous sodium carbonate solution (2×10 ml)
3. dry with materialdried (MgSO4)
4. customevaporated
5. customto give an oil which
6. customwas purified by flash column chromatography on silica gel