Dimethylformamide → 3-(3,5-Dichloro-4-formylphenyl)-propionic acid tert-butyl ester

HRID 1360794

Reaktionsgleichung

Reaktionsgleichung von HRID 1360794
[C:1]([O:5][C:6](=[O:17])[CH2:7][CH2:8][C:9]1[CH:14]=[C:13]([Cl:15])[CH:12]=[C:11]([Cl:16])[CH:10]=1)([CH3:4])([CH3:3])[CH3:2].C([Li])(CC)C.CN([CH:26]=[O:27])C>C1COCC1>[C:1]([O:5][C:6](=[O:17])[CH2:7][CH2:8][C:9]1[CH:14]=[C:13]([Cl:15])[C:12]([CH:26]=[O:27])=[C:11]([Cl:16])[CH:10]=1)([CH3:4])([CH3:2])[CH3:3]

Komponenten

5

Edukt 3

HCID 6228DimethylformamideHCID 669653423-(3,5-Dichlorophenyl)-propionic acid tert-butyl esterHCID 178418400CID 53628100

Produkt 1

HCID 866328253-(3,5-Dichloro-4-formylphenyl)-propionic acid tert-butyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a solution of 3-(3,5-Dichloro-phenyl)-propionic acid tert butyl ester (1 g, 3.6 mmol) in THF (50 mL) at −78 C was added dropwise s-butyl lithium (1.4 M cyclohexanes; 5.7 mL, 2.2 eq). The resulting red colored homogeneous solution was stirred under nitrogen at −78 C for one hour, at which time DMF (560 mL, 2 eq) was added. After 30 minutes, quenched reaction with saturated ammonium chloride solution at −78 C. Removed ice bath and allowed reaction to reach room temperature. Evaporation of volatiles in vacuo, partitioned between water and ethyl acetate. Combined ethyl acetate fractions were dried over magnesium sulfate and appropriately loaded onto a silica gel column. Isolated 600 mg of titled compound after chromatography (isocratic 20% ethyl acetate/n-heptanes). 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 1.35-1.44 (m, 10H) 2.55 (t, J=7.45 Hz, 2H) 2.90 (t, J=7.45 Hz, 2H) 7.23 (s, 2H) 10.45 (s, 1H).

Aufarbeitung

  1. additionwas added
  2. customquenched
  3. customreaction with saturated ammonium chloride solution at −78 C
  4. customRemoved ice bath and allowed
  5. customreaction
  6. customto reach room temperature
  7. customEvaporation of volatiles in vacuo
  8. custompartitioned between water and ethyl acetate
  9. dry with materialCombined ethyl acetate fractions were dried over magnesium sulfate

Quellen und Nachweise

ORD-Eintrag
ord-ffce2ba158674c2c9a561fcc2f77ced6
Quelldatensatz
uspto-grants-2011_02
Patentnummer
US07879850B2

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