Methanol → Methyl 4,5-Dibromo-2-furancarboxylate

HRID 1845476Notes

Reaction equation

HRID 1845476 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([C:8]([OH:10])=[O:9])[O:5][C:6]=1[Br:7].S(=O)(=O)(O)O.[CH3:16]O>>[Br:1][C:2]1[CH:3]=[C:4]([C:8]([O:10][CH3:16])=[O:9])[O:5][C:6]=1[Br:7]

Participants

4

Reactant 3

HCID 887MethanolHCID 1118Sulfuric AcidHCID 41948324,5-Dibromofuran-2-carboxylic acid

Product 1

HCID 4135083Methyl 4,5-Dibromo-2-furancarboxylateYield 92%

Conditions

Temperature
50 °C

Procedure

To a solution of 4,5-dibromo-2-furancarboxylic acid (5.7 g, 21.1 mmol) in methanol (106 ml) was added sulfuric acid (11.3 ml, 211 mmol). The resulting solution stirred at 50° C. over 4 days. The reaction mixture was partitioned between H2O-DCM and the aqueous phase was washed several times with DCM. The combined organic fractions were dried over Na2SO4, concentrated and used directly without further purification providing methyl 4,5-dibromo-2-furancarboxylate (5.5 g, 19.4 mmol, 92% yield): LCMS (ES) m/e 283 (M+H)+.

Workup

  1. customThe reaction mixture was partitioned between H2O-DCM
  2. washthe aqueous phase was washed several times with DCM
  3. dry with materialThe combined organic fractions were dried over Na2SO4
  4. concentrationconcentrated
  5. customused directly without further purification

Sources & evidence

ORD record
ord-5b7a498f70f148b79abff966574d3ad1
Source dataset
uspto-grants-2015_02
Patent number
US08946278B2

Reaction notes

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