反应详情

A mixture of methyl 5-hydroxy-3-methyl-2-(propan-2-yloxy)pyridine-4-carboxylate (131c, 0.70 g, 3.1 mmol), tert-butyl (2-bromoethyl)carbamate (0.76 g, 3.4 mmol) and K2CO3 (0.86 g, 6.2 mmol) in CH3CN (24 mL) was degassed with N2 and refluxed for 15 hours. To the reaction mixture was added brine (40 mL) and EtOAc (40 mL). The aqueous layer was extracted with EtOAc (20 mL). The combined organic layers were washed with brine (60 mL), dried over Na2SO4 and concentrated under vacuum. The residue was purified by column chromatography (petroleum ether/EtOAc, 10/1) to give methyl 5-{2-[(tert-butoxycarbonyl)amino]ethoxy}-3-methyl-2-(propan-2-yloxy)pyridine-4-carboxylate (131d, 0.74 g, 65%) as yellow oil.

1. customwas degassed with N2
2. temperaturerefluxed for 15 hours
3. additionTo the reaction mixture was added brine (40 mL) and EtOAc (40 mL)
4. extractionThe aqueous layer was extracted with EtOAc (20 mL)
5. washThe combined organic layers were washed with brine (60 mL)
6. dry with materialdried over Na2SO4
7. concentrationconcentrated under vacuum
8. customThe residue was purified by column chromatography (petroleum ether/EtOAc, 10/1)