反应详情

温度

0 °C

Trimethyloxonium tetrafluoroborate (1.775 g, 12.00 mmol) was added to a mixture of 5-ethyl 6-tert-butyl 2-hydroxy-7,8-dihydro-1,6-naphthyridine-5,6(5H)-dicarboxylate (1.289 g, 4.00 mmol) and acetonitrile (18 mL) at 0° C. The mixture was stirred at 0° C. for 2 hr, and the reaction mixture was poured into ice-cooled saturated aqueous sodium hydrogencarbonate solution (100 mL), and the mixture was extracted with ethyl acetate (×3). The organic layer was washed with water and brine, and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (solvent gradient; 2→19% ethyl acetate/hexane) to give 5-ethyl 6-tert-butyl 2-methoxy-7,8-dihydro-1,6-naphthyridine-5,6(5H)-dicarboxylate (372 mg, 1.106 mmol, 28%) as a colorless oil.

1. additionthe reaction mixture was poured into ice-
2. extractionthe mixture was extracted with ethyl acetate (×3)
3. washThe organic layer was washed with water and brine
4. dry with materialdried over magnesium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe obtained residue was purified by silica gel column chromatography (solvent gradient; 2→19% ethyl acetate/hexane)