5H-Dibenzo[a,d]cyclohepten-5-one → 5-(2,4-bis(1,1-dimethylethoxy)pyrimidin-5-yl)-5H-dibenzo[a,d]cyclohepten-5-ol

HRID 1275877

Reaktionsgleichung

Reaktionsgleichung von HRID 1275877
Br[C:2]1[C:3]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[N:4][C:5]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[N:6][CH:7]=1.C([Li])CCC.[CH:23]1[C:33]2[CH:32]=[CH:31][C:30]3[CH:34]=[CH:35][CH:36]=[CH:37][C:29]=3[C:28](=[O:38])[C:27]=2[CH:26]=[CH:25][CH:24]=1.[Cl-].[NH4+]>O1CCCC1.CCCCCC>[CH3:10][C:9]([CH3:12])([O:8][C:5]1[N:4]=[C:3]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])[C:2]([C:28]2([OH:38])[C:29]3[CH:37]=[CH:36][CH:35]=[CH:34][C:30]=3[CH:31]=[CH:32][C:33]3[CH:23]=[CH:24][CH:25]=[CH:26][C:27]2=3)=[CH:7][N:6]=1)[CH3:11]

Komponenten

7

Edukt 4

HCID 166795H-Dibenzo[a,d]cyclohepten-5-oneHCID 25517Ammonium ChlorideHCID 8188515-Bromo-2,4-bis(1,1-dimethylethoxy)pyrimidineHCID 178418339Butyllithium

Produkt 1

HCID 212508825-(2,4-bis(1,1-dimethylethoxy)pyrimidin-5-yl)-5H-dibenzo[a,d]cyclohepten-5-ol

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 8028TetrahydrofuranLösungsmittel2×HCID 8058HexaneLösungsmittel

Reaktionsbedingungen

Temperatur
-78 °C

Versuchsvorschrift

To a solution of the product of step (i) (50 g) in dry tetrahydrofuran (11) at -78° C. was added n-butyllithium (69 ml of a 2.5M solution in hexane) dropwise such that the internal temperature of the reaction did not rise above -65° C. After 0.5 hours a solution of 5H-dibenzo[a,d]cyclohepten-5-one (44 g) in tetrahydrofuran (100 ml) was added. The reaction mixture was stirred at -78° C. for three hours and then allowed to warm to room temperature overnight. Saturated aqueous ammonium chloride solution (400 ml) was added and the mixture extracted with ethyl acetate. The organic solution was dried (MgSO4) and evaporated under reduced pressure to give the crude 5-{2,4-bis(1,1-dimethylethoxy)pyrimidin-5-yl)-5H-dibenzo[a,d]cyclohepten-5-ol which was used directly. To a stirred solution of this product and triethylsilane (64 ml) in dry dichloromethane (400 ml) cooled in an ice-bath was added trifluoroacetic acid (150 ml) dropwise over ten minutes. The cooling bath was removed and the solution was stirred at room temperature overnight. Toluene (300 ml) was added and solution was evaporated under reduced pressure. The residue was azeotroped with toluene (3 times). The oil was treated with diethyl ether and the precipitated product collected as a white powder. Yield 44 g.

Aufarbeitung

  1. customdid not rise above -65° C
  2. temperatureto warm to room temperature overnight
  3. extractionthe mixture extracted with ethyl acetate
  4. dry with materialThe organic solution was dried (MgSO4)
  5. customevaporated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-9c6595942b2147e0861c381aabbf9df7
Quelldatensatz
uspto-grants-2000_12
Patentnummer
US06162808

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