Methyl iodide → (R)-3-tert-butoxycarbonylamino-4-(3'-chloro-biphenyl-4-yl)-2-methyl-butyric acid ethyl ester

HRID 70919

Reaktionsgleichung

Reaktionsgleichung von HRID 70919
[CH2:1]([O:3][C:4](=[O:29])[CH2:5][C@H:6]([NH:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([Cl:20])[CH:15]=2)=[CH:10][CH:9]=1)[CH3:2].[Li+].[CH3:31][Si]([N-][Si](C)(C)C)(C)C.C1COCC1.CI.C(#N)C.O>C1COCC1>[CH2:1]([O:3][C:4](=[O:29])[C@H:5]([CH3:31])[CH:6]([NH:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:7][C:8]1[CH:9]=[CH:10][C:11]([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([Cl:20])[CH:15]=2)=[CH:12][CH:13]=1)[CH3:2]

Komponenten

6

Edukt 4

HCID 6328Methyl iodideHCID 18373917Acetonitrile--water (1/1)HCID 23714775LiHMDS tetrahydrofuranHCID 59607603(R)-ethyl 3-(tert-butoxycarbonylamino)-4-(3'-chlorobiphenyl-4-yl)butanoate

Produkt 1

HCID 67208757(R)-3-tert-butoxycarbonylamino-4-(3'-chloro-biphenyl-4-yl)-2-methyl-butyric acid ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
-78 °C

Versuchsvorschrift

To a solution of (R)-3-tert-butoxycarbonylamino-4-(3′-chloro-biphenyl-4-yl)-butyric acid ethyl ester (300 mg, 0.718 mmol) in THF (10 ml) at −78° C. is added LiHMDS/THF (1M) (1.579 ml, 1.579 mmol). The reaction mixture is stirred at −78° C. for 50 min and then to this mixture is added methyl iodine (0.054 ml, 0.861 mmol) and the reaction is slowly warmed up to room temperature and stirred over night. The reaction is quenched by sat. NH4Cl and is extracted with EtOAc. The combined organic layer is washed with brine and dried over anhydrous sodium sulfate, filtered and concentrated to give the crude. Reverse phase HPLC [20 to 90% ACN—H2O (0.1% TFA) over 10 min by Sunfire C18] give (R)-3-tert-butoxycarbonylamino-4-(3′-chloro-biphenyl-4-yl)-2-methyl-butyric acid ethyl ester. LCMS (condition B): 432 (M+1); retention time=1.55 min. To a solution of (R)-3-tert-butoxycarbonylamino-4-(3′-chloro-biphenyl-4-yl)-2-methyl-butyric acid ethyl ester (240 mg, 0.556 mmol) in DCM (2 ml) at room temperature was added TFA (1.070 ml, 13.89 mmol) and the mixture is stirred at room temperature. 1 hr the reaction is done so the mixture is concentrated to give (R)-3-amino-4-(3′-chloro-biphenyl-4-yl)-2-methyl-butyric acid ethyl ester trifluoroacetate. LCMS (condition B): 332 (M+1); retention time=1.00 min.

Aufarbeitung

  1. temperaturethe reaction is slowly warmed up to room temperature
  2. stirringstirred over night
  3. customThe reaction is quenched by sat. NH4Cl
  4. extractionis extracted with EtOAc
  5. washThe combined organic layer is washed with brine
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customto give the crude

Quellen und Nachweise

ORD-Eintrag
ord-fbe8fce9fa9d45038b4e3d6a534129c7
Quelldatensatz
uspto-grants-2014_09
Patentnummer
US08822534B2

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