Homovanillic Acid → N-(4,4-dipropylcyclohexyl)-2-(4-hydroxy-3-methoxyphenyl)acetamide

HRID 500069

Reaktionsgleichung

Reaktionsgleichung von HRID 500069
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([OH:11])=O)=[CH:4][C:3]=1[O:12][CH3:13].Cl.C(N=C=N[CH2:20][CH2:21][CH2:22][N:23](C)C)C.C(O[CH2:30][CH3:31])(=O)C>>[CH2:4]([C:5]1([CH2:8][CH2:30][CH3:31])[CH2:20][CH2:21][CH:22]([NH:23][C:9](=[O:11])[CH2:8][C:5]2[CH:6]=[CH:7][C:2]([OH:1])=[C:3]([O:12][CH3:13])[CH:4]=2)[CH2:7][CH2:6]1)[CH2:3][CH3:2]

Komponenten

4

Edukt 3

HCID 1738Homovanillic AcidHCID 8857Ethyl AcetateHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Produkt 1

HCID 57626703N-(4,4-dipropylcyclohexyl)-2-(4-hydroxy-3-methoxyphenyl)acetamide

Reaktionsbedingungen

Temperatur
25 °C

Versuchsvorschrift

4,4-Dipropyl-2-cyclohexenone (2.0 g) was dissolved in ethanol (20 ml), 10% palladium/carbon (200 mg) was added to the solution, and the mixture was hydrogenated at 25° C. The catalyst was removed by filtration from the reaction mixture, and the solvent was removed in vacuo to give 4,4-dipropylcyclohexanone. The product was dissolved in methanol/water=1/1 (20 ml). Hydroxylamine hydrochloride (1.55 g) and sodium acetate (1.83 g) were added to the solution, and the mixture was stirred with heating at 50° C. for 12 hours. After removing the methanol in vacuo, the residue was extracted with ethyl acetate. The organic layer was washed with water, and the solvent was removed in vacuo. The residue was purified by a silica gel chromatography (eluent: gradient from 100% hexane/0% ethyl acetate to 0% hexane/100% ethyl acetate) to give 1.4 g of 4,4-dipropylcyclohexanone oxime. A solution of the product in tetrahydrofuran (10 ml) was added dropwise to a solution of lithium aluminium hydride (420 mg) in tetrahydrofuran (10 ml) under ice-cooling, and the mixture was stirred. After 3 hours, the reaction was quenched by adding water (0.42 ml), 15% aqueous sodium hydroxide (0.42 ml), and then water (1.26 ml) dropwise to the reaction mixture. The precipitate was filtered off and then the solvent was removed in vacuo. The residue was dissolved in 2 mol/l aqueous hydrochloric acid, washed with diethyl ether, basified with 2 mol/l aqueous sodium hydroxide, and then extracted with chloroform. The organic layer was concentrated under reduced pressure to give 165 mg of 4,4-dipropylcyclohexylamine. The product (100 mg) was dissolved in ethyl acetate (5 ml), and 4-hydroxy-3-methoxyphenyacetic acid (100 mg) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (110 mg) were added to the solution, and the mixture was stirred at 25° C. for 12 hours. The reaction mixture was washed with water and then the solvent was removed in vacuo. The residue was purified by a silica gel chromatography (eluent: gradient from 100% hexane/0% ethyl acetate to 0% hexane/100% ethyl acetate) to give 120 mg of the desired compound.

Aufarbeitung

  1. washThe reaction mixture was washed with water
  2. customthe solvent was removed in vacuo
  3. customThe residue was purified by a silica gel chromatography (eluent: gradient from 100% hexane/0% ethyl acetate to 0% hexane/100% ethyl acetate)

Quellen und Nachweise

ORD-Eintrag
ord-671197d5636649a894864d584c191b4c
Quelldatensatz
uspto-grants-2010_08
Patentnummer
US07767854B2

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