反应详情

To a solution of Example 183B (205 mg, 0.363 mmol) in 10 mL dichloromethane was added N-ethyl-N-isopropylpropan-2-amine (254 μL, 1.452 mmol) and ethanesulfonyl chloride (120 μL, 1.271 mmol). The mixture was stirred at ambient temperature overnight. The mixture was concentrated. The viscous oil residue was taken into dioxane (10 mL) and treated with sodium hydroxide (5446 μL, 5.45 mmol, 1N aqueous solution). The mixture was stirred at ambient temperature for 80 minutes and then quenched with saturated ammonium hydroxide solution, and partitioned between water and ethyl acetate. The aqueous phase was extracted with ethyl acetate (2×). The combined organic phases were washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated and the residue was purified by column chromatography on silica gel with a gradient of 0-60% ethyl acetate in heptanes to give the title compound (110 mg, 0.167 mmol, 46.1% yield).

1. concentrationThe mixture was concentrated
2. stirringThe mixture was stirred at ambient temperature for 80 minutes
3. customquenched with saturated ammonium hydroxide solution
4. custompartitioned between water and ethyl acetate
5. extractionThe aqueous phase was extracted with ethyl acetate (2×)
6. washThe combined organic phases were washed with saturated aqueous sodium chloride
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. concentrationThe filtrate was concentrated
10. customthe residue was purified by column chromatography on silica gel with a gradient of 0-60% ethyl acetate in heptanes