反应详情

Cyanuric fluoride (0.018 mL, 0.215 mmol) was added to a mixture of 3-(1-(4-chlorophenyl)cyclopropyl)propanoic acid (47 mg, 0.209 mmol) and pyridine (0.017 mL, 0.215 mmol) in dichloromethane (5 mL). After 1 h, the reaction mixture was diluted with dichloromethane and washed with 1M aq. HCl solution. The organic layer was dried (MgSO4), filtered and concentrated. The crude residue was dissolved in acetonitrile (5 mL). (Z)-tert-butyl 3-(2-hydroxy-2-(4-(N′-hydroxycarbamimidoyl)phenyl)ethylamino) propanoate (67.6 mg, 0.209 mmol) and diisopropylethyl amine (0.037 mL, 0.209 mmol) were added and the mixture was stirred at room temperature for 1 h. A 1M solution of tetra-n-butylammonium fluoride in THF (0.314 mL, 0.314 mmol) was added and the mixture was heated to 75° C. overnight. The reaction mixture was diluted with ethyl acetate and washed with saturated aqueous NaCl solution. The organic layer was dried (MgSO4), filtered and concentrated. The crude residue was treated with 1:1 mixture of dichloromethane and trifluoroacetic acid for 1 h. The mixture was concentrated, diluted with AcCN, filtered, and purified by HPLC (HPLC conditions: Phenomenex Luna C18 5 micron column (250×30 mm); 25-100% AcCN/water (0.1% TFA); 25 minute gradient; 20 mL/min) to obtain N-(2-(4-(5-(2-(1-(4-chlorophenyl)cyclopropyl)ethyl)-1,2,4-oxadiazol-3-yl)phenyl)-2-hydroxyethyl)-beta-alanine (38 mg, 25% yield) as a colorless oil. 1H NMR (400 MHz, MeOH-d3): δ ppm 8.02 (2H, m), 7.59 (2H, m, J=8.35 Hz), 7.30-7.36 (2H, m), 7.22-7.28 (2H, m), 5.06 (1H, m), 3.32-3.41 (1H, m), 3.13-3.26 (1H, m), 2.92 (1H, t, J=7.58 Hz), 2.80 (2H, t, J=6.81 Hz), 2.15 (1H, t, J=7.58 Hz), 1.58-1.7 (1H, m), 1.35-1.46 (2H, m), 1.02 (2H, t, J=7.25 Hz), 0.72-0.84 (3H, m).

1. washwashed with 1M aq. HCl solution
2. dry with materialThe organic layer was dried (MgSO4)
3. filtrationfiltered
4. concentrationconcentrated
5. dissolutionThe crude residue was dissolved in acetonitrile (5 mL)
6. temperaturethe mixture was heated to 75° C. overnight
7. washwashed with saturated aqueous NaCl solution
8. dry with materialThe organic layer was dried (MgSO4)
9. filtrationfiltered
10. concentrationconcentrated
11. additionThe crude residue was treated with 1:1 mixture of dichloromethane and trifluoroacetic acid for 1 h
12. concentrationThe mixture was concentrated
13. additiondiluted with AcCN
14. filtrationfiltered
15. custompurified by HPLC (HPLC conditions: Phenomenex Luna C18 5 micron column (250×30 mm); 25-100% AcCN/water (0.1% TFA); 25 minute gradient; 20 mL/min)