Boron tribromide → 1-Chloro-7-fluoroisoquinolin-4-OL

HRID 1852221Notes

Reaction equation

HRID 1852221 reaction equation
[Cl:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([F:12])[CH:10]=2)[C:5]([O:13]C)=[CH:4][N:3]=1.B(Br)(Br)Br>C(Cl)Cl>[Cl:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([F:12])[CH:10]=2)[C:5]([OH:13])=[CH:4][N:3]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 222502381-Chloro-7-fluoro-4-methoxyisoquinoline

Product 1

HCID 717427161-Chloro-7-fluoroisoquinolin-4-OLYield 93%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of 1-chloro-7-fluoro-4-methoxyisoquinoline (0.75 g, 3.54 mmol) in DCM (10 ml) was added BBr3 (6.22 g, 24.81 mmol) at 0° C. drop wise. The reaction mass was refluxed for 5 h. The residue was cooled and quenched with methanol. The solvent was evaporated under reduced pressure and the residue was diluted with cold water. The precipitated solid was filtered, washed with water to get crude compound (0.65 g, 93%) as pale yellow solid. 1H NMR (400 MHz, CD3OD): δ ppm 8.36-8.33 (m, 1H), 7.89-7.86 (d, J=12 Hz, 1H), 7.76 (s, 1H), 7.64 (t, J=10 Hz, 1H); MS: MS m/z 198.0 (M++1).

Workup

  1. temperatureThe reaction mass was refluxed for 5 h
  2. temperatureThe residue was cooled
  3. customquenched with methanol
  4. customThe solvent was evaporated under reduced pressure
  5. additionthe residue was diluted with cold water
  6. filtrationThe precipitated solid was filtered
  7. washwashed with water

Sources & evidence

ORD record
ord-b01971e8b3ea4317b52aacaed5bbd159
Source dataset
uspto-grants-2015_02
Patent number
US08957203B2

Reaction notes

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