反应详情

A mixture of 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (311 mg, 1.21 mmol), 2-(5-amino-pyridin-2-ylamino)-ethanol (84 mg, 0.55 mmol), N-hydroxybenzotriazole (185 mg, 1.38 mmol), and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (264 mg, 1.38 mmol) in a mixture of methylene chloride (5 mL) and DMF (1 mL) was stirred at room temperature for 5 hr. The solvents were removed, and lithium hydroxide hydrate (excess) in a mixed solvent of methanol, tetrahydrofuran, and water (3:1:1, 5 mL) was added. The reaction mixture was stirred at room temperature for overnight. Solvents were removed, and water was added. The resulted mixture was extracted twice with ethyl acetate. The organic layers were collected, and washed with water, brine, dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck silica gel 60, 230-400 mesh, 0-15% methanol in methylene chloride for 30 min), and then preparative HPLC (0-90% acetonitrile in water for 20 min), followed by lyophilization gave 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid [6-(2-hydroxy-ethylamino)-pyridin-3-yl]-amide as a light yellow solid. LCMS calcd for C18H15F3N4O3 (m/e) 392, obsd 393 (M+H).

1. customThe solvents were removed
2. additionlithium hydroxide hydrate (excess) in a mixed solvent of methanol, tetrahydrofuran, and water (3:1:1, 5 mL) was added
3. stirringThe reaction mixture was stirred at room temperature for overnight
4. customSolvents were removed
5. additionwater was added
6. extractionThe resulted mixture was extracted twice with ethyl acetate
7. customThe organic layers were collected
8. washwashed with water, brine
9. dry with materialdried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customFlash chromatography (Merck silica gel 60, 230-400 mesh, 0-15% methanol in methylene chloride for 30 min)
13. custompreparative HPLC (0-90% acetonitrile in water for 20 min)