Tetrahydrofuran → 1-(4-bromo-5-fluoro-2-methylphenyl)-N-(isoxazol-3-yl)-2-oxo-1,2-dihydroquinoline-6-sulfonamide

HRID 1504449Notes

Reaction equation

HRID 1504449 reaction equation
[Br:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([N:9]2[C:18]3[C:13](=[CH:14][C:15]([S:19](OC4C(F)=C(F)C(F)=C(F)C=4F)(=[O:21])=[O:20])=[CH:16][CH:17]=3)[CH:12]=[CH:11][C:10]2=[O:34])=[C:4]([CH3:35])[CH:3]=1.[O:36]1[CH:40]=[CH:39][C:38]([NH2:41])=[N:37]1.C1COCC1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+]>Cl.CCOC(C)=O>[Br:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([N:9]2[C:18]3[C:13](=[CH:14][C:15]([S:19]([NH:41][C:38]4[CH:39]=[CH:40][O:36][N:37]=4)(=[O:21])=[O:20])=[CH:16][CH:17]=3)[CH:12]=[CH:11][C:10]2=[O:34])=[C:4]([CH3:35])[CH:3]=1

Participants

7

Reactant 4

HCID 8028TetrahydrofuranHCID 18102163-IsoxazolamineHCID 2733832Lithium Hexamethyldisilazide2×HCID 117736966Perfluorophenyl 1-(4-bromo-5-fluoro-2-methylphenyl)-2-oxo-1,2-dihydroquinoline-6-sulfonate

Product 1

HCID 1177372241-(4-bromo-5-fluoro-2-methylphenyl)-N-(isoxazol-3-yl)-2-oxo-1,2-dihydroquinoline-6-sulfonamideYield 70.5%

Reagents, catalysts & solvents 2

HCID 313Hydrochloric AcidSolventHCID 8857Ethyl AcetateSolvent

Procedure

Under a nitrogen atmosphere, a solution of perfluorophenyl 1-(4-bromo-5-fluoro-2-methylphenyl)-2-oxo-1,2-dihydroquinoline-6-sulfonate (1.50 g, 2.59 mmol), isoxazol-3-amine (0.268 ml, 3.63 mmol) and THF (25.9 ml) was cooled in an ice-bath for 15 min, then lithium bis(trimethylsilyl)amide (1M in THF) (6.48 ml, 6.48 mmol) was added dropwise. After 10 min, the whole was warmed to rt and stirred for 30 min. 6.48 mL of additional LHMDS was added and the reaction was stirred for 1 h. The mixture was diluted with 1N aq. HCl and EtOAc. The layers were separated, and the organic layer was washed with 1N aq. HCl. The aq. layers were combined and extracted with EtOAc (2×). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated. The crude material was absorbed onto a plug of silica gel and purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g), eluting with a gradient of 0% to 70% EtOAc in heptane, to provide 1-(4-bromo-5-fluoro-2-methylphenyl)-N-(isoxazol-3-yl)-2-oxo-1,2-dihydroquinoline-6-sulfonamide (873 mg, 70.4% yield) as brown solid. m/z (ESI) [M+H]+=477.9. NMR (400 MHz, DMSO-d6) δ ppm 1.17 (t, J=7.15 Hz, 1 H) 1.86 (s, 2 H) 1.99 (s, 1 H) 5.55 (br. s., 1 H) 5.88 (d, J=1.76 Hz, 1 H) 6.44 (d, J=1.87 Hz, 1 H) 6.78 (d, J=9.02 Hz, 1H) 6.83 (d, J=9.64 Hz, 1 H) 7.55 (d, J=9.12 Hz, 1 H) 7.84 (dd, J=8.91, 2.28 Hz, 1 H) 7.92 (dd, J=7.57, 0.52 Hz, 1 H) 8.27 (d, J=9.54 Hz, 1 H) 8.32 (d, J=1.76 Hz, 1 H) 8.40 (d, J=2.28 Hz, 1 H) 8.72 (d, J=1.76 Hz, 1 H) 11.67 (s, 1 H).

Workup

  1. stirringthe reaction was stirred for 1 h
  2. customThe layers were separated
  3. washthe organic layer was washed with 1N aq. HCl
  4. extractionextracted with EtOAc (2×)
  5. dry with materialThe combined organic extracts were dried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe crude material was absorbed onto a plug of silica gel
  9. custompurified by chromatography through a Redi-Sep pre-packed silica gel column (40 g)
  10. washeluting with a gradient of 0% to 70% EtOAc in heptane

Sources & evidence

ORD record
ord-2a579cba26ad48668468d9a7e1467927
Source dataset
uspto-grants-2015_12
Patent number
US09212182B2

Reaction notes

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