1-Tetradecanol → 5-(Tetradecyloxy)-2-furoic acid

HRID 1974168Notes

Reaction equation

HRID 1974168 reaction equation
Br[C:2]1[O:6][C:5]([C:7]([OH:9])=[O:8])=[CH:4][CH:3]=1.[CH2:10]([OH:24])[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH3:23].CC(C)([O-])C.[K+].CC(N(C)C)=O>O1CCCC1.C(O)(C)(C)C>[CH2:10]([O:24][C:2]1[O:6][C:5]([C:7]([OH:9])=[O:8])=[CH:4][CH:3]=1)[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH3:23]

Participants

7

Reactant 4

HCID 82091-TetradecanolHCID 31374DimethylacetamideHCID 685115-Bromo-2-furanecarboxylic acidHCID 23665647Potassium tert-butoxide

Product 1

HCID 1151755-(Tetradecyloxy)-2-furoic acid

Reagents, catalysts & solvents 2

HCID 6386tert-ButanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

A mixture of 125.0 g (0.652 mole) of 5-bromo-2-furoic acid, 210.0 g (0.978 mole) of 1-tetradecanol 183.0 g (1.630 mole) of potassium tert- butoxide and 2500 ml of dimethyl acetamide is heated with stirring. The tertbutanol formed in the reaction is allowed to distill off, then the mixture is heated to reflux with stirring for 48 hours. To the cooled mixture is added 6 liters of icewater, and the mixture is acidified with malonic acid. The resulting precipitate is collected, dried and recrystallized twice from methanol to give 82.0 g (29%) of 5-(tetradecyloxy)-2-furoic acid, M.P. 112°-115° C (dec.) The 82.0 g (0.253 mole) of 5-(tetradecyloxy)-2-furoic acid, 41.0 g (0.253 mole) of N,N'-carbonyldiimidazole and tetrahydrofuran are combined and stirred at room temperature, during which time carbon dioxide gas is evolved, then cooled to give N-[5-(tetradecyloxy)-2-furoyl]imidazole. The N-substituted imidazole, 50.0 g (0.134 mole) in tetrahydrofuran, is cooled in an ice bath. An equivalent amount of methyl magnesium bromide (50 ml of a 3 Molar solution in ether) is slowly added over 2 hours to the stirred mixture. The reaction is stirred for an additional 3 hours then excess (500 ml.) of 2N HCl is added and the product extracted into ether. The ether layer is separated, washed with water, dried over sodium sulfate, filtered, and evaporated to dryness affording 5-(tetradecyloxy)-2-furyl methyl ketone.

Workup

  1. temperatureis heated
  2. distillationto distill off
  3. temperaturethe mixture is heated
  4. temperatureto reflux
  5. stirringwith stirring for 48 hours
  6. additionTo the cooled mixture is added 6 liters of icewater
  7. customThe resulting precipitate is collected
  8. customdried
  9. customrecrystallized twice from methanol

Sources & evidence

ORD record
ord-02359d57e96c4b7388a9184986fad1f7
Source dataset
uspto-grants-1976_12
Patent number
US04000164

Reaction notes

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