反应详情

4-Azido-N-(2-piperidin-1-ylethyl)benzamide obtained in Example 62a) and ethyl 3-oxohexanoate (1.08 ml, 6.44 mmol, 1.25 eq.) were dissolved in ethanol (20 ml), sodium ethoxide (487 mg, 6.44 mmol, 1.25 eq.) was added, and the mixture was stirred at room temperature for 30 min, and then at 60° C. for 13 hr. Water (40 ml) was added to the reaction mixture, ethanol was evaporated, and the residue was washed twice with ethyl acetate-hexane (2:1, 50 ml). The aqueous layer was neutralized (pH 6-7) with 6N hydrochloric acid and concentrated. The residue was dissolved in isobutanol, THF and ethyl acetate, dried over anhydrous sodium sulfate and concentrated, and ethyl acetate and THF were added to the residue. The precipitate was collected by filtration, washed with ethyl acetate and dried to give the title compound as a pale-brown powder (purity 90%, 2.05 g, 4.78 mmol, 92.9%).

1. waitat 60° C. for 13 hr
2. customwas evaporated
3. washthe residue was washed twice with ethyl acetate-hexane (2:1, 50 ml)
4. concentrationconcentrated
5. dissolutionThe residue was dissolved in isobutanol
6. dry with materialTHF and ethyl acetate, dried over anhydrous sodium sulfate
7. concentrationconcentrated
8. additionethyl acetate and THF were added to the residue
9. filtrationThe precipitate was collected by filtration
10. washwashed with ethyl acetate
11. customdried