反应详情

温度

25 °C

A solution of 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]-thiazole-5-carboxylic acid (100 mg, 0.24 mmol) in dry tetrahydrofuran (3 mL) under argon was treated with N-methylmorpholine (0.04 mL, 0.36 mmol) followed by iso-butylchloroformate (50 μL, 0.36 mmol). The reaction was stirred at 25° C. for 2 h, after which time, a concentrated aqueous ammonium hydroxide solution (0.2 mL) was added. The resulting reaction mixture was stirred at 25° C. for 2 h. The reaction mixture was then treated with water (5 mL), and the tetrahydrofuran was concentrated in vacuo. The product was then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 9/1 chloroform/methanol) afforded 2-[3-cyclopentyl-2-(4-methanesulfonyl-phenyl)-propionylamino]-thiazole-5-carboxylic acid amide (68 mg, 67%) as a white solid: mp 155-160° C.; EI-HRMS m/e calcd for C19H23N3O4S2(M+) 421.1130, found 421.1135.

1. customThe resulting reaction mixture
2. stirringwas stirred at 25° C. for 2 h
3. concentrationthe tetrahydrofuran was concentrated in vacuo
4. extractionThe product was then extracted with ethyl acetate (3×10 mL)
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo