Water → 4-[(R)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-nitromethyl-butyryl]-2-methyl-benzoic acid tert-butyl ester

HRID 589629

Reaktionsgleichung

Reaktionsgleichung von HRID 589629
[C:1]([O:5][C:6](=[O:30])[C:7]1[CH:12]=[CH:11][C:10]([C:13](=[O:28])/[CH:14]=[C:15](\[C:20]2[CH:25]=[C:24]([Cl:26])[CH:23]=[C:22]([Cl:27])[CH:21]=2)/[C:16]([F:19])([F:18])[F:17])=[CH:9][C:8]=1[CH3:29])([CH3:4])([CH3:3])[CH3:2].[N+:31]([CH3:34])([O-:33])=[O:32].C(=O)([O-])[O-].[K+].[K+].O>C1(C)C=CC=CC=1>[C:1]([O:5][C:6](=[O:30])[C:7]1[CH:12]=[CH:11][C:10]([C:13](=[O:28])[CH2:14][C@@:15]([C:20]2[CH:25]=[C:24]([Cl:26])[CH:23]=[C:22]([Cl:27])[CH:21]=2)([CH2:34][N+:31]([O-:33])=[O:32])[C:16]([F:17])([F:19])[F:18])=[CH:9][C:8]=1[CH3:29])([CH3:4])([CH3:3])[CH3:2]

Komponenten

6

Edukt 4

HCID 962WaterHCID 6375NitromethaneHCID 11430Potassium CarbonateHCID 866959924-[(E)-3-(3,5-Dichloro-phenyl)-4,4,4-trifluoro-but-2-enoyl]-2-methyl-benzoic acid tert-butyl ester

Produkt 1

HCID 547615654-[(R)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-nitromethyl-butyryl]-2-methyl-benzoic acid tert-butyl esterAusbeute 60 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Reaktionsbedingungen

Temperatur
50 °C

Versuchsvorschrift

Alternatively, 4-[(E)-3-(3,5-Dichloro-phenyl)-4,4,4-trifluoro-but-2-enoyl]-2-methyl-benzoic acid tert-butyl ester (0.075 g, 0.163 mmol) and antracen-9-yl-methyl quininium bromide (0.020 g, 0.034 mmol) were dissolved in toluene (2.0 ml). Nitromethane (10 molar equivalents) and potassium carbonate (0.025 g, 0.181 mmol) were added and the resulting suspension was stirred at 50° C. for 24 h. The reaction mixture was cooled to room temperature and water was added. The resulting mixture was extracted with dichloromethane (3×) and the combined organic fractions were dried over sodium sulfate. The crude product was purified by flash chromatography (0% to 5% ethyl acetate in cyclohexane) to afford 4-[(R)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-nitromethyl-butyryl]-2-methyl-benzoic acid tert-butyl ester (0.051 g, 60%) as a white foam. Chiral HPLC analysis (Chiralpack AS-RH, Heptane/2-propanol=90:10, 1 ml/min, retention time 6.13 minutes (major enantiomer), 7.35 minutes (minor enantiomer)) indicated that the reaction proceeded with 62% enantioselectivity.

Aufarbeitung

  1. temperatureThe reaction mixture was cooled to room temperature
  2. extractionThe resulting mixture was extracted with dichloromethane (3×)
  3. dry with materialthe combined organic fractions were dried over sodium sulfate
  4. customThe crude product was purified by flash chromatography (0% to 5% ethyl acetate in cyclohexane)

Quellen und Nachweise

ORD-Eintrag
ord-5fca0dc66ecb47a79a3d55cbd83af659
Quelldatensatz
uspto-grants-2016_01
Patentnummer
US09233920B2

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