反应详情

温度

20 °C

To a solution of ethyl N-{[7-(5-{3-chloro-4-[(1-methylethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)-1H-indol-3-yl]methyl}glycinate (D73) (130 mg) in tetrahydrofuran (10 mL) and methanol (5 mL) stirred at 20° C. was added a solution of sodium hydroxide (28 mg) in water (5 mL) in one charge. The reaction mixture was stirred at 20° C. for 4 hours. The reaction mixture was concentrated to about 5 mL and then H2SO4 (0.1 M) solution was added dropwise until no further white precipitate was formed. The solid was filtered and washed with EtOAc. The solid was collected and then was suspended in methanol (5 mL). The mixture was acidified with HCl (1 M) solution to pH around 1 to form a clear solution. After most of the solvent was evaporated off, the residue was freeze-dried to afford N-{[7-(5-{3-chloro-4-[(1-methylethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)-1H-indol-3-yl]methyl}glycine (E47) (48 mg) as a hydrochloride salt. δH (DMSO-d6, 400 MHz): 1.38 (6H, d), 3.84 (2H, s), 4.43 (2H, s), 4.90-4.93 (1H, m), 7.34 (1H, t), 7.48 (1H, d), 7.72-7.73 (1H, m), 8.02 (1H, d), 8.05 (1H, d), 8.23 (1H, dd), 8.41 (1H, d), 9.34 (1H, br s), 11.38 (1H, s). MS (ES): C22H21ClN4O4 requires 440; found 366.1 (M—NHCH2COOH+).

1. additioncharge
2. concentrationThe reaction mixture was concentrated to about 5 mL
3. additionH2SO4 (0.1 M) solution was added dropwise until no further white precipitate
4. customwas formed
5. filtrationThe solid was filtered
6. washwashed with EtOAc
7. customThe solid was collected
8. customto form a clear solution
9. customAfter most of the solvent was evaporated off
10. customthe residue was freeze-dried