1H-1,2,4-Triazole, 1-methyl- → 3-(4-Bromo-2-(2-methyl-2H-[1,2,4]triazol-3-yl)-thiazol-5-yl)-7-(1-ethyl-propyl)-2,5-dimethyl-pyrazolo[1,5-a]pyrimidine

HRID 1660744Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1660744
C([Li])CCC.[CH3:6][N:7]1[CH:11]=[N:10][CH:9]=[N:8]1.Br[C:13]1[S:14][C:15]([C:19]2[C:20]([CH3:34])=[N:21][N:22]3[C:27]([CH:28]([CH2:31][CH3:32])[CH2:29][CH3:30])=[CH:26][C:25]([CH3:33])=[N:24][C:23]=23)=[C:16]([Br:18])[N:17]=1>C1COCC1.C(OCC)(=O)C.[Cl-].[Zn+2].[Cl-]>[Br:18][C:16]1[N:17]=[C:13]([C:11]2[N:7]([CH3:6])[N:8]=[CH:9][N:10]=2)[S:14][C:15]=1[C:19]1[C:20]([CH3:34])=[N:21][N:22]2[C:27]([CH:28]([CH2:29][CH3:30])[CH2:31][CH3:32])=[CH:26][C:25]([CH3:33])=[N:24][C:23]=12

Komponenten

7

Edukt 3

HCID 224591H-1,2,4-Triazole, 1-methyl-HCID 674295502,4-Dibromo-5-(2,5-dimethyl-7-(pentan-3-yl)pyrazolo[1,5-a]pyrimidin-3-yl)thiazoleHCID 178418339Butyllithium

Produkt 1

HCID 248989763-(4-Bromo-2-(2-methyl-2H-[1,2,4]triazol-3-yl)-thiazol-5-yl)-7-(1-ethyl-propyl)-2,5-dimethyl-pyrazolo[1,5-a]pyrimidineAusbeute 33,4 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 3007855ZincchlorideKatalysatorHCID 8028TetrahydrofuranLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

Under nitrogen atmosphere, add n-butyl lithium (2.5 M in hexane, 0.6 mL, 1.5 mmol) to a solution of 1-methyl-1,2,4-triazole (124.5 mg, 1 5 mmol) in THF (3 mL) at −78° C. and stir for 30 min. Add anhydrous zinc chloride (409 mg, 3 0 mmol), continue stirring for 30 min, warm up to room temperature and stir for 2 h. Add 3-(2,4-dibromo-thiazol-5-yl)-7-(1-ethyl-propyl)-2,5-dimethyl-pyrazolo[1,5-a]pyrimidine (229 mg, 0.5 mmol), followed by tetrakis(triphenylphosine)palladium (58 mg, 0.05 mmol) and reflux overnight. Cool to room temperature, dilute with ethyl acetate, and wash with saturated ammonia chloride. Dry the organic portion over sodium sulfate, filter, and concentrate to a residue. Purify the crude material by flash chromatography, eluting with hexanes:ethyl acetate (10:2.5) to give the title compound as a yellow foam (77 mg). MS (APCI) m/z (79Br) 460.4 (M+1)+.

Aufarbeitung

  1. stirringstir for 2 h
  2. temperaturereflux overnight
  3. temperatureCool to room temperature
  4. washwash with saturated ammonia chloride
  5. dry with materialDry the organic portion over sodium sulfate
  6. filtrationfilter
  7. concentrationconcentrate to a residue
  8. customPurify the crude material by flash chromatography
  9. washeluting with hexanes:ethyl acetate (10:2.5)

Quellen und Nachweise

ORD-Eintrag
ord-ae9514e516a14f6fbdd45ef397009a19
Quelldatensatz
uspto-grants-2011_10
Patentnummer
US08030304B2

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