N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride → HCID 71571673, compound

HRID 1750783Notes

Reaction equation

HRID 1750783 reaction equation
[OH:1][N:2]=[C:3](Cl)[C:4]1[CH:15]=[CH:14][C:7]2[B:8]([OH:13])[O:9][C:10]([CH3:12])([CH3:11])[C:6]=2[CH:5]=1.[Cl:17][C:18]1[CH:23]=[C:22]([C:24]([C:26]([F:29])([F:28])[F:27])=[CH2:25])[CH:21]=[C:20]([Cl:30])[C:19]=1[CH:31]([F:33])[F:32]>CN(C=O)C>[Cl:17][C:18]1[CH:23]=[C:22]([C:24]2([C:26]([F:29])([F:27])[F:28])[O:1][N:2]=[C:3]([C:4]3[CH:15]=[CH:14][C:7]4[B:8]([OH:13])[O:9][C:10]([CH3:12])([CH3:11])[C:6]=4[CH:5]=3)[CH2:25]2)[CH:21]=[C:20]([Cl:30])[C:19]=1[CH:31]([F:32])[F:33]

Participants

4

Reactant 2

HCID 86685046N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chlorideHCID 86685053HCID 86685053, compound

Product 1

HCID 71571673HCID 71571673, compoundYield 28%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of crude N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride (156 mg, 0.65 mmol) and 1,3-dichloro-2-(difluoromethyl)-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene (210 mg, 0.72 mmol) in DMF (8 mL) at rt was added TEA (100 μL, 0.72 mmol). The reaction mixture was stirred for 12 h, poured into ice-water and extracted with EA. 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-dichloro-4(difluoromethyl)phenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)-3,3-dimethyl-benzo[c][1,2]oxaborol-1(3H)-ol (90 mg; yield 28% over 3 steps) as a white solid. 1H NMR (500 MHz, DMSO-d6): δ 9.268 (s, 1 H), 7.796 (s, 2H), 7.757-7.771 (m, 2 H), 7.694-7.710 (m, 1H), 7.389 (t, J=52.0 Hz, 1 H), 4.451 (d, J=18.0 Hz, 1 H), 4.344 (d, J=18.0 Hz, 1 H), 1.476 (s,6 H); HPLC purity: 99.28% at 220 nm and 100% at 254 nm; MS: m/z=494.0 (M+1, ESI+).

Workup

  1. extractionextracted with EA
  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-28526be7f3054df0959ad65136f7f8a8
Source dataset
uspto-grants-2015_10
Patent number
US09156860B2

Reaction notes

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