Catechol → 4-Fluorobenzo[d][1,3]dioxole

HRID 1496884Notes

Reaction equation

HRID 1496884 reaction equation
BrCBr.[F:4][C:5]1[CH:11]=[CH:10][CH:9]=[C:7]([OH:8])[C:6]=1[OH:12].[C:13]1(C(=CC=CC=1)O)O>[Cl-].C[N+](CCCCCCCC)(CCCCCCCC)CCCCCCCC.[OH-].[Na+].C(Cl)Cl.O>[F:4][C:5]1[CH:11]=[CH:10][CH:9]=[C:7]2[O:8][CH2:13][O:12][C:6]=12

Participants

8

Reactant 3

HCID 289CatecholHCID 3024DibromomethaneHCID 677643-Fluorocatechol

Product 1

HCID 157672604-Fluorobenzo[d][1,3]dioxole

Reagents, catalysts & solvents 4

HCID 21218Trioctylmethylammonium chlorideCatalystHCID 962WaterSolvent2×HCID 6344DichloromethaneSolventHCID 14798Sodium HydroxideSolvent

Procedure

Alliquat 336 (methyltrioctylammonium chloride (0.63 g, 0.0016 mol), dibromomethane (40.7 g, 234.2 mmol), and water (31 mL) were placed in a 500 mL 3-necked flask equipped with an addition funnel, condenser and a stir bar. The addition funnel was charged with a solution of 3-fluorocatechol (20.0 g, 6.1 mmol) in 5M sodium hydroxide (80 mL). The mixture in the flask was heated to reflux and the solution of the catechol was added dropwise with good stiffing over 1.5 hours. The resulting dark mixture was heated an additional 2 hours at reflux. After cooling to room temperature, the reaction was diluted with methylene chloride and water. The aqueous layer was extracted with methylene chloride and the combined organic layers were dried and concentrated to give 1-fluoro-2,3-methylenedioxybenzene (14.6 g, 104.2 mmol) as a dark yellow oil: 1H NMR (CDCl3): δ 6.80 (m, 1H), 6.68 (m, 2H), 6.04 (s, 2H).

Workup

  1. customequipped with an addition funnel, condenser and a stir bar
  2. temperatureThe mixture in the flask was heated
  3. temperatureto reflux
  4. temperatureThe resulting dark mixture was heated an additional 2 hours
  5. temperatureat reflux
  6. extractionThe aqueous layer was extracted with methylene chloride
  7. customthe combined organic layers were dried
  8. concentrationconcentrated

Sources & evidence

ORD record
ord-5aa1716a1e4a425da37cb4a9e62acc2d
Source dataset
uspto-grants-2015_12
Patent number
US09199943B2

Reaction notes

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