Hydrochloric Acid → 3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde

HRID 532207Notes

Reaction equation

HRID 532207 reaction equation
[F:1][CH2:2][C:3]1([CH2:14][F:15])[O:7][B:6]([OH:8])[C:5]2[CH:9]=[CH:10][C:11]([CH3:13])=[CH:12][C:4]1=2.C1C(=O)N(Br)C(=[O:19])C1.C([O-])([O-])=O.[Na+].[Na+].Cl>C(Cl)(Cl)(Cl)Cl>[F:1][CH2:2][C:3]1([CH2:14][F:15])[O:7][B:6]([OH:8])[C:5]2[CH:9]=[CH:10][C:11]([CH:13]=[O:19])=[CH:12][C:4]1=2

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 10340Sodium CarbonateHCID 67184N-bromobutanimideHCID 866850763,3-bis(fluoromethyl)-5-methylbenzo[c][1,2]oxaborol-1(3H)-ol

Product 1

HCID 866850753,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehydeYield 107.3%

Reagents, catalysts & solvents 1

HCID 5943Carbon TetrachlorideSolvent

Procedure

A solution of 3,3-bis(fluoromethyl)-5-methylbenzo[c][1,2]oxaborol-1(3H)-ol (350 mg, 1.65 mmol), NBS (647 mg, 3.63 mmol), and BPO (40 mg, 0.17 mmol) in CCl4 (10 mL) was refluxed overnight. After treating with aqueous Na2CO3, the aqueous phase was acidified with HCl (3 N) to pH of 3, and then extracted with EA. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to afford the crude product (400 mg) as a yellow solid that was used directly in the next step without purification. 1H NMR (300 MHz, CDCl3): δ 10.09 (s, 1H), 7.98-7.94 (m, 3H), 4.79-4.74 (m, 2H), 4.63-4.59 (m, 2H).

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

Sources & evidence

ORD record
ord-604e0c15d278473594b1726893b6c9b8
Source dataset
uspto-grants-2014_10
Patent number
US08853186B2

Reaction notes

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