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

HRID 589626

Reaktionsgleichung

Reaktionsgleichung von HRID 589626
[N+:1]([CH3:4])([O-:3])=[O:2].[C:5]([O:9][C:10](=[O:34])[C:11]1[CH:16]=[CH:15][C:14]([C:17](=[O:32])/[CH:18]=[C:19](\[C:24]2[CH:29]=[C:28]([Cl:30])[CH:27]=[C:26]([Cl:31])[CH:25]=2)/[C:20]([F:23])([F:22])[F:21])=[CH:13][C:12]=1[CH3:33])([CH3:8])([CH3:7])[CH3:6]>O>[C:5]([O:9][C:10](=[O:34])[C:11]1[CH:16]=[CH:15][C:14]([C:17](=[O:32])[CH2:18][C@@:19]([C:24]2[CH:29]=[C:28]([Cl:30])[CH:27]=[C:26]([Cl:31])[CH:25]=2)([CH2:4][N+:1]([O-:3])=[O:2])[C:20]([F:22])([F:21])[F:23])=[CH:13][C:12]=1[CH3:33])([CH3:8])([CH3:7])[CH3:6]

Komponenten

4

Edukt 2

HCID 6375NitromethaneHCID 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 ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Reaktionsbedingungen

Temperatur
50 °C

Versuchsvorschrift

Alternatively, to a solution of 3-[3,5-bis(trifluoromethyl)anilino]-4-[[(S)-(6-methoxy-4-quinolyl)-[(1S,2S,5S)-5-vinylquinuclidin-2-yl]methyl]amino]cyclobut-3-ene-1,2-dione (13 mg, prepared according to the literature: Org. Lett., 2010, 12 (23), 5450-5453) and nitromethane (0.6 ml) under argon, was added 4-[(E)-3-(3,5-Dichloro-phenyl)-4,4,4-trifluoro-but-2-enoyl]-2-methyl-benzoic acid tert-butyl ester (100 mg). The solution was heated for 5 days at 50° C. then more catalyst (15 mg) was added. The reaction was heated again for 3 days at 50° C. then allowed to stand at room temperature for 15 days. Water was then added and the resulting mixture was extracted with dichloromethane 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 (26 mg). Chiral HPLC analysis (Chiralpack IA, Heptane:2-propanol=90:10, 1 ml/min, retention time 6.13 minutes (major enantiomer), 7.29 minutes (minor enantiomer) indicated that the reaction proceeded with 61% enantioselectivity in favor of the R enantiomer.

Aufarbeitung

  1. temperatureThe reaction was heated again for 3 days at 50° C.
  2. extractionthe resulting mixture was extracted with dichloromethane
  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-580cc2c3d43a428cbe5984ad6ae2fd41
Quelldatensatz
uspto-grants-2016_01
Patentnummer
US09233920B2

Verknüpfte Notizen

Wird geladen…