Methyl iodide → 1,5-Dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

HRID 450453Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 450453
[CH3:1][C:2]1[C:6]([B:7]2[O:11][C:10]([CH3:13])([CH3:12])[C:9]([CH3:15])([CH3:14])[O:8]2)=[CH:5][NH:4][N:3]=1.[C:16](=O)([O-])[O-].[K+].[K+].IC>C(#N)C.CCOC(C)=O>[CH3:16][N:4]1[CH:5]=[C:6]([B:7]2[O:11][C:10]([CH3:13])([CH3:12])[C:9]([CH3:15])([CH3:14])[O:8]2)[C:2]([CH3:1])=[N:3]1.[CH3:16][N:3]1[C:2]([CH3:1])=[C:6]([B:7]2[O:11][C:10]([CH3:13])([CH3:12])[C:9]([CH3:15])([CH3:14])[O:8]2)[CH:5]=[N:4]1

Komponenten

7

Edukt 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 178434487HCID 178434487, Verbindung

Produkt 2

HCID 426473131,5-Dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazoleAusbeute 166,7 %HCID 426473161,3-Dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6342AcetonitrileLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

3-Methyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (0.3 g, 1.442 mmol) and potassium carbonate (0.996 g, 7.21 mmol) were suspended in acetonitrile (10 ml) and stirred overnight at RT. Additional iodomethane (0.5 ml) was added and the mixture was stirred overnight at RT. The mixture was diluted with EtOAc and the inorganic salts were removed by filtration. The filtrate was evaporated to yield an inseparable mixture (2:1) of 1,3-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole and 1,5-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.267 g, 83% yield). MS (ESI) m/z: 223.1 (M+H+).

Aufarbeitung

  1. stirringthe mixture was stirred overnight at RT
  2. customthe inorganic salts were removed by filtration
  3. customThe filtrate was evaporated

Quellen und Nachweise

ORD-Eintrag
ord-58b83968c1d144188f08b04f53ea63ca
Quelldatensatz
uspto-grants-2013_07
Patentnummer
US08486951B2

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