1,3-Dichloro-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene → 5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)-6-fluoro-3,3-dimethylbenzo[c][1,2]oxaborol-1(3H)-ol

HRID 532238Notes

Reaction equation

HRID 532238 reaction equation
[F:1][C:2]1[C:3]([C:14](Cl)=[N:15][OH:16])=[CH:4][C:5]2[C:9]([CH3:11])([CH3:10])[O:8][B:7]([OH:12])[C:6]=2[CH:13]=1.[Cl:18][C:19]1[CH:24]=[C:23]([C:25]([C:27]([F:30])([F:29])[F:28])=[CH2:26])[CH:22]=[C:21]([Cl:31])[CH:20]=1>CN(C=O)C>[Cl:18][C:19]1[CH:24]=[C:23]([C:25]2([C:27]([F:30])([F:28])[F:29])[O:16][N:15]=[C:14]([C:3]3[C:2]([F:1])=[CH:13][C:6]4[B:7]([OH:12])[O:8][C:9]([CH3:11])([CH3:10])[C:5]=4[CH:4]=3)[CH2:26]2)[CH:22]=[C:21]([Cl:31])[CH:20]=1

Participants

4

Reactant 2

HCID 231598231,3-Dichloro-5-(3,3,3-trifluoroprop-1-en-2-yl)benzeneHCID 866850996-fluoro-N,1-dihydroxy-3,3-dimethyl-1,3-dihydro benzo[c][1,2]oxaborole-5-carbimidoyl chloride

Product 1

HCID 715721235-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)-6-fluoro-3,3-dimethylbenzo[c][1,2]oxaborol-1(3H)-olYield 29%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of the crude compound 6-fluoro-N,1-dihydroxy-3,3-dimethyl-1,3-dihydro benzo[c][1,2]oxaborole-5-carbimidoyl chloride (300 mg, 0.92 mmol) and 1,3-dichloro-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene (222 mg, 0.92 mmol) in DMF (5 mL) at rt was added TEA (152 μL, 1.1 mmol). The reaction mixture was stirred for 12 h, poured into ice-water and extracted with DCM (60 mL×3). The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by prep-TLC eluted with PE-EA (3:2) and then purified by combiflash to give the title compound 5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)-6-fluoro-3,3-dimethylbenzo[c][1,2]oxaborol-1(3H)-ol (108 mg; yield 29% over 3 steps) as a white solid. 1H NMR (400 MHz, DMSO-d6): δ 9.379 (s, 1H), 7.815-7.848 (m, 2H), 7.660 (s, 2H), 7.513 (d, J=10.0 Hz, 1H), 4.401 (d, J=18.4 Hz, 1H), 4.254 (d, J=18.8 Hz, 1H), 1.485 (s, 6H) ppm; HPLC purity: 100% at 220 nm and 100% at 254 nm; MS: m/z=462.0 (M+1, ESI+).

Workup

  1. extractionextracted with DCM (60 mL×3)
  2. washThe organic layer was washed with brine
  3. dry with materialdried over Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified
  7. washby prep-TLC eluted with PE-EA (3:2)
  8. custompurified by combiflash

Sources & evidence

ORD record
ord-8a4f8e4b86e74ac9847171a2021781e1
Source dataset
uspto-grants-2014_10
Patent number
US08853186B2

Reaction notes

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