Hydrochloric Acid → (2R)-4-[3-(2-fluoro-3-methoxyphenyl)isoxazol-5-yl]-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide
Reaction equation
Cl.[F:2][C:3]1[C:8]([O:9][CH3:10])=[CH:7][CH:6]=[CH:5][C:4]=1[C:11]1[CH:15]=[C:14]([CH2:16][CH2:17][C@@:18]([CH3:33])([S:29]([CH3:32])(=[O:31])=[O:30])[C:19]([NH:21][O:22]C2CCCCO2)=[O:20])[O:13][N:12]=1>O1CCOCC1.ClCCl.O>[F:2][C:3]1[C:8]([O:9][CH3:10])=[CH:7][CH:6]=[CH:5][C:4]=1[C:11]1[CH:15]=[C:14]([CH2:16][CH2:17][C@@:18]([CH3:33])([S:29]([CH3:32])(=[O:31])=[O:30])[C:19]([NH:21][OH:22])=[O:20])[O:13][N:12]=1Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
Hydrochloric acid (4.0 M in 1,4-dioxane, 0.49 mL, 1.9 mmol, 4.0 equiv) was added to a solution of (2R)-4-[3-(2-fluoro-3-methoxyphenyl)isoxazol-5-yl]-2-methyl-2-(methylsulfonyl)-N-(tetrahydro-2H-pyran-2-yloxy)butanamide (0.23 g, 0.49 mmol, 1.0 equiv) in 1,4-dioxane-dichloromethane-water (2:2:1, 5 mL), and the reaction was allowed to stir at room temperature for 2 h. The solvent was removed under reduced pressure, and the resulting crude material was purified by flash chromatography (30 g C18 reverse phase column, 5-60% gradient acetonitrile in water) to provide (2R)-4-[3-(2-fluoro-3-methoxyphenyl)isoxazol-5-yl]-N-hydroxy-2-methyl-2-(methylsulfonyl)butanamide as a light brown solid (0.09 g, 48%). MS (LCMS) m/z 387.1 (M+1). 1H NMR (400 MHz, METHONAL-d4) δ1.67 (s, 3H) 2.20-2.38 (m, 1H) 2.80 (s, 2H) 2.95-3.09 (m, 1H) 3.10 (s, 3H) 3.94 (s, 3H) 6.68 (d, J=3.12 Hz, 1H) 7.22 (dd, J=5.95, 1.17 Hz, 2H) 7.33-7.51 (m, 1H).
Workup
- customThe solvent was removed under reduced pressure
- customthe resulting crude material was purified by flash chromatography (30 g C18 reverse phase column, 5-60% gradient acetonitrile in water)
Sources & evidence
- ORD record
- ord-c46930f20f394c71b891aa00f7264cfd
- Source dataset
- uspto-grants-2014_06
- Patent number
- US08748466B2
Reaction notes
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