Diisopropylamine → 2-tert-Butyl-5-[2-(2,4-difluoro-benzyl)-butyl]-3-methyl-4-oxo-tetrahydro-pyrimidine-1-carboxylic Acid Methyl Ester

HRID 349821Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 349821
C(NC(C)C)(C)C.C([Li])CCC.[CH3:13][O:14][C:15]([N:17]1[CH2:22][CH2:21][C:20](=[O:23])[N:19]([CH3:24])[C@@H:18]1[C:25]([CH3:28])([CH3:27])[CH3:26])=[O:16].[F:29][C:30]1[CH:35]=[C:34]([F:36])[CH:33]=[CH:32][C:31]=1[CH2:37][C@@H:38]([CH2:41]I)[CH2:39][CH3:40]>C1COCC1>[CH3:13][O:14][C:15]([N:17]1[CH2:22][CH:21]([CH2:41][CH:38]([CH2:37][C:31]2[CH:32]=[CH:33][C:34]([F:36])=[CH:35][C:30]=2[F:29])[CH2:39][CH3:40])[C:20](=[O:23])[N:19]([CH3:24])[CH:18]1[C:25]([CH3:28])([CH3:27])[CH3:26])=[O:16]

Komponenten

6

Edukt 4

HCID 7912DiisopropylamineHCID 69268259(S)-2,4-difluoro-1-(2-iodomethyl-butyl)-benzeneHCID 69268866(S)-2-tert-butyl-3-methyl-4-oxo-tetrahydro-pyrimidine-1-carboxylic acid methyl esterHCID 178418339Butyllithium

Produkt 1

HCID 692681512-tert-Butyl-5-[2-(2,4-difluoro-benzyl)-butyl]-3-methyl-4-oxo-tetrahydro-pyrimidine-1-carboxylic Acid Methyl EsterAusbeute 46,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel3×

Reaktionsbedingungen

Temperatur
-78 °C

Versuchsvorschrift

A flask was charged with 1.35 mL (9.64 mmol) of diisopropyl amine and 15 mL of dry THF. The solution was cooled to −78° C. and 6.0 mL (9.64 mmol) of 1.6 M n-butyl lithium solution in hexanes was added. The mixture was warmed to 0° C. and stirred for 30 minutes. The mixture was cooled again to −78° C. and 2.0 g (8.76 mmol) of (2S)-2-tert-butyl-3-methyl-4-oxo-tetrahydro-pyrimidine-1-carboxylic acid methyl ester was added as a solution in 10 mL of THF. This mixture was warmed to 0° C. and stirred for 1 hour. The anion solution was cooled again to −78° C. and 2.99 g (9.64 mmol) of (S)-2,4-difluoro-1-(2-iodomethyl-butyl)-benzene was added as a solution in THF. The mixture was stirred at −78° C. for 4 hours. The reaction mixture was warmed to −21° C. and stirred at that temperature for 5 days. The reaction mixture was quenched with sat. aq. ammonium chloride solution. The crude reaction mixture was extracted with diethyl ether. The ether was removed under reduced pressure, and the crude residue was purified by column chromatography (9:1 hexanes/EtOAc eluent) which gave 1.67 g (46% yield) of the titled compound as a white solid.

Aufarbeitung

  1. temperatureThe mixture was warmed to 0° C.
  2. temperatureThe mixture was cooled again to −78° C.
  3. temperatureThis mixture was warmed to 0° C.
  4. stirringstirred for 1 hour
  5. temperatureThe anion solution was cooled again to −78° C.
  6. stirringThe mixture was stirred at −78° C. for 4 hours
  7. temperatureThe reaction mixture was warmed to −21° C.
  8. stirringstirred at that temperature for 5 days
  9. customThe reaction mixture was quenched with sat. aq. ammonium chloride solution
  10. customThe crude reaction mixture
  11. extractionwas extracted with diethyl ether
  12. customThe ether was removed under reduced pressure
  13. customthe crude residue was purified by column chromatography (9:1 hexanes/EtOAc eluent) which

Quellen und Nachweise

ORD-Eintrag
ord-d9bd408acdde46dbbf33316d9aced5d6
Quelldatensatz
uspto-grants-2007_02
Patentnummer
US07179934B2

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