反应详情

温度

60 °C

To a solution of commercially available 6,7-dihydro-4H-pyrano[4,3-d]thiazol-2-amine (1.73 g, 11.1 mmol, JW-Pharmalab) in tetrahydrofuran/N,N-dimethylformamide (5:1, 60 mL) were added 5-chloro-2-methoxybenzoic acid (2.27 g, 12.2 mmol, Aldrich), 1-hydroxybenzotriazole (1.9 g, 12.2 mmol, Aldrich), N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (2.3 g, 12.2 mmol, Aldrich) and triethylamine (4.6 ml, 33.2 mmol). After stirring at 60° C. for 16 h, the reaction mixture was cooled, diluted with EtOAc (50 mL) and quenched with saturated NaHCO3 (50 mL). The aqueous layer was extracted with EtOAc (2×50 mL). The combined organic extracts were washed with brine (50 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was purified by column chromatography using an Analogix® Intelliflash280 ™ (SiO2, 0-5% methanol in methylene chloride). MS (ESI+) m/z 325 (M+H)+.

1. temperaturethe reaction mixture was cooled
2. customquenched with saturated NaHCO3 (50 mL)
3. extractionThe aqueous layer was extracted with EtOAc (2×50 mL)
4. washThe combined organic extracts were washed with brine (50 mL)
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by column chromatography