反应详情

A mixture of ethyl 5-benzyloxy-4-methyl-1H-indole-2-carboxylate (3.50 g, 11.3 mmol), 60% sodium hydride (0.45 g, 11.3 mmol) and N,N-dimethylformamide (70 ml) was stirred at room temperature for 30 minutes, and then methyl iodide (3.21 g, 22.6 mmol) was added dropwise thereto, followed by stirring at room temperature for another 2.5 hours. The reaction mixture was poured into a 5% aqueous sodium chloride solution and extracted twice with ethyl acetate, and the extract solution was washed with a 5% aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent:ethyl acetate/n-hexane=3/97) to obtain 3.53 g of ethyl 5-benzyloxy-1,4-dimethyl-1H-indole-2-carboxylate.

1. stirringby stirring at room temperature for another 2.5 hours
2. extractionextracted twice with ethyl acetate
3. washthe extract solution was washed with a 5% aqueous sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. distillationThe solvent was distilled off under reduced pressure
6. customthe resulting residue was purified by a silica gel column chromatography (eluent:ethyl acetate/n-hexane=3/97)