反应详情

温度

50 °C

A mixture of 5.05 g of 5-methyl-2-furanecarboxylic acid, 7.14 g of CDI, and 40 mL of DMF was stirred at 50° C. for 2 hours. To the reaction solution were added 6.71 g of DBU and 6.53 g of 2-methyl-2-propanol at room temperature, followed by stirring at 50° C. for 48 hours. The reaction solution was concentrated under reduced pressure, and the obtained residue was diluted with diethyl ether and washed with a 5% aqueous ammonium chloride solution, a saturated aqueous sodium hydrogen carbonate solution, and then a saturated aqueous sodium chloride solution in this order. The organic layer was 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 2.82 g of tert-butyl 5-methyl-2-furanecarboxylate as a yellow oily substance.

1. stirringby stirring at 50° C. for 48 hours
2. concentrationThe reaction solution was concentrated under reduced pressure
3. additionthe obtained residue was diluted with diethyl ether
4. washwashed with a 5% aqueous ammonium chloride solution
5. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate)