Ethanol → HCID 17989266, compound

HRID 1443241Notes

Reaction equation

HRID 1443241 reaction equation
[F:1][C:2]1[C:3]([O:17][CH3:18])=[C:4]([C:8]2([CH2:11][C:12](=[O:16])[C:13]([OH:15])=[O:14])[CH2:10][CH2:9]2)[CH:5]=[CH:6][CH:7]=1.S(=O)(=O)(O)O.[CH2:24](O)[CH3:25]>>[CH2:24]([O:14][C:13](=[O:15])[C:12](=[O:16])[CH2:11][C:8]1([C:4]2[CH:5]=[CH:6][CH:7]=[C:2]([F:1])[C:3]=2[O:17][CH3:18])[CH2:10][CH2:9]1)[CH3:25]

Participants

4

Reactant 3

HCID 702EthanolHCID 1118Sulfuric AcidHCID 17989260HCID 17989260, compound

Product 1

HCID 17989266HCID 17989266, compound

Procedure

The organic phase is separated, and the aqueous phase is extracted several times with diethyl ether. It is washed with brine, dried with sodium sulfate, and concentrated by evaporation in a vacuum. After chromatographic purification on silica gel (hexane/ethyl acetate 5%-10%), 28.5 g of 1-(3-fluoro-2-methoxyphenyl)-cyclohexylnitrile is obtained. 27.5 g (118 mmol) of the nitrile is slowly mixed in 430 ml of toluene at −78° C. with 147 ml (176 mmol) of diisobutyl aluminum hydride solution (20% in toluene), and after 3 hours at −78° C., 35 ml of isopropanol is added in drops. It is allowed to heat to −5° C., and 600 ml of a 10% aqueous tartaric acid solution is added. After dilution with ether, it is stirred vigorously, the organic phase is separated, and the aqueous phase is extracted several times with ethyl acetate. It is washed with brine, dried with sodium sulfate, and concentrated by evaporation in a vacuum. 27.5 g of aldehyde is obtained as a yellow oil. A solution of 5.7 g (21.2 mmol) of 2-diethylphosphono-2-ethoxyacetic acid-ethyl ester in 25 ml of tetrahydrofuran is mixed, while being cooled with ice, within 15 minutes with 13.6 ml (27.2 mmol) of a 2 M solution of lithium diisopropylamide in tetrahydrofuran-heptane-toluene, and it is stirred for 20 minutes at 0° C. Within 30 minutes, a solution of 5 g (21.2 mmol) of 1-(3-fluoro-2-methoxyphenyl)-cyclohexylformanal in 5 ml of tetrahydrofuran is added in drops at 0° C. After 16 hours at room temperature, ice water is added, and it is extracted several times with ether. It is washed with saturated ammonium chloride solution, dried on sodium sulfate, and concentrated by evaporation. The crude product is saponified with 6 g of sodium hydroxide in 100 ml of ethanol and 50 ml of water over 4 days at room temperature. 1.7 g of acid, which is stirred over 30 hours at 90° C. with 35 ml of 2N sulfuric acid and 7 ml of acetic acid, is obtained. After cooling, it is made basic with potassium carbonate, washed with ether and acidified with hydrochloric acid. After extraction with ethyl acetate, washing with saturated sodium chloride solution and removal of the solvent, 1.09 g of crude keto acid is obtained. 1.09 g (3.7 mmol) of 3-[1-(3-fluoro-2-methoxyphenyl)-cyclopropyl]-2-oxopropionic acid and 0.45 ml of sulfuric acid (96%) are refluxed in 40 ml of ethanol for 2 hours. The batch is concentrated by evaporation in a vacuum, the residue is added to ice water and made basic with saturated sodium bicarbonate solution. It is extracted several times with ethyl acetate, washed with saturated sodium chloride solution, dried (sodium sulfate) and concentrated by evaporation in a vacuum. After chromatographic purification on silica gel (hexane/ethyl acetate 20%), 1.05 g of ethyl-3-[1-(3-fluoro-2-methoxyphenyl)-cyclopropyl]-2-oxopropionate is obtained.

Workup

  1. concentrationThe batch is concentrated by evaporation in a vacuum
  2. additionthe residue is added to ice water
  3. extractionIt is extracted several times with ethyl acetate
  4. washwashed with saturated sodium chloride solution
  5. dry with materialdried (sodium sulfate)
  6. concentrationconcentrated by evaporation in a vacuum
  7. customAfter chromatographic purification on silica gel (hexane/ethyl acetate 20%)

Sources & evidence

ORD record
ord-b049d002abbe44fa86bcfaa024066b94
Source dataset
uspto-grants-2010_02
Patent number
US07659297B2

Reaction notes

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