反应详情

温度

85 °C

3-{4-[5-(4-tert-Butoxycarbonylamino-phenyl)-[1,2,4]oxadiazol-3-yl]-3-fluoro-phenyl}-2-[4-(4-methyl-benzyl)-piperazine-1-sulfonylamino]-propionic acid ethyl ester. A mixture of oxazolidione from Step A (40 mg, 0.065 mmol), 1-(4-methylbenzyl)piperazine (24.7 mg, 0.13 mmol), and triethylamine (20 mg, 0.2 mmol) in acetonitrile (3 mL) was heated at 85° C. for 2.5 hrs. TLC showed the reaction was completed. The solution was concentrated. Ethyl acetate (20 mL) and 1N aq. HCl solution (10 mL) were added to the solution. The layers were separated, and the aqueous portion was extracted with ethyl acetate (20 mL). The combined organic layer was washed with brine (2×20 mL), dried over anhydrous sodium sulfate, filtered, and concentrated to give the title compound (32 mg, 69% yield) as a yellow solid.

1. concentrationThe solution was concentrated
2. additionEthyl acetate (20 mL) and 1N aq. HCl solution (10 mL) were added to the solution
3. customThe layers were separated
4. extractionthe aqueous portion was extracted with ethyl acetate (20 mL)
5. washThe combined organic layer was washed with brine (2×20 mL)
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated