反应详情

A mixture of triethylsilane (5.1 g), trifluoroacetic acid (3.1 g) and 1,2-dichloroethane (20 mL) at −10° C. was treated dropwise with a mixture of 4-phenylsulfonylpyridine-3-carbaldehyde (1.9 g), (5-fluoro-2-methylindol-1-yl)acetic acid methyl ester (0.66 g) and 1,2-dichloroethane (20 mL), and the resulting mixture was stirred at room temperature for 20 hours. The mixture was treated with additional triethylsilane (5.1 g) and trifluoroacetic acid (3.1 g), and stirred at room temperature for 3 hours and then at 50° C. for 20 hours. The mixture was diluted with dichloromethane, washed with saturated aqueous sodium hydrogen carbonate solution and dried over magnesium sulfate. The solvent was removed under reduced pressure and the residue was purified by column chromatography on silica gel, eluting with a mixture of cyclohexane and ethyl acetate (1:0 to 0:1 by volume), followed by trituration with diethyl ether to afford the title compound as a yellow powder (0.19 g).

1. stirringstirred at room temperature for 3 hours
2. waitat 50° C. for 20 hours
3. washwashed with saturated aqueous sodium hydrogen carbonate solution
4. dry with materialdried over magnesium sulfate
5. customThe solvent was removed under reduced pressure
6. customthe residue was purified by column chromatography on silica gel
7. washeluting with a mixture of cyclohexane and ethyl acetate (1:0 to 0:1 by volume)