反应详情

To a solution of 3.69 g of di-tert-butyl imidodicarbonate in 54 ml of DMF was added 1.91 g of potassium tert-butoxide at 0° C. under argon, followed by stirring at room temperature for 1 hour. A solution of 2.7 g of methyl 5-(chloromethyl)thiophene-3-carboxylate in 8.1 ml of DMF was slowly added thereto, followed by stirring at room temperature overnight. Water and ethyl acetate were added to the reaction solution, followed by carrying out an extraction operation, and the organic layer was washed with a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate) to obtain 4.394 g of methyl 5-{[bis(tert-butoxycarbonyl)amino]methyl}thiophene-3-carboxylate.

1. stirringby stirring at room temperature overnight
2. washthe organic layer was washed with a saturated aqueous sodium chloride solution
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate)