Sodium Carbonate → 5-amino-4-ethenyl-2,2,6,7-tetramethyl-1-benzofuran-3(2H)-one

HRID 1850379Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1850379
C(B1[O:7][C:6]([CH3:9])([CH3:8])[C:5]([CH3:11])(C)[O:4]1)=C.C(=O)([O-])[O-].[Na+].[Na+].[NH2:18][C:19]1[C:20]([CH3:33])=[C:21]([CH3:32])[C:22]2OC(C)(C)[C:24](=O)[C:23]=2[C:30]=1Br>C(OCC)(=O)C.O.COCCOC.C(O)C>[NH2:18][C:19]1[C:20]([CH3:33])=[C:21]([CH3:32])[C:22]2[O:7][C:6]([CH3:8])([CH3:9])[C:5](=[O:4])[C:11]=2[C:30]=1[CH:23]=[CH2:24]

Komponenten

8

Edukt 3

HCID 10340Sodium CarbonateHCID 52330122-Ethenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 667597955-amino-4-bromo-2,2,6,7-tetramethyl-1-benzofuran-3(2H)-one

Produkt 1

HCID 667591945-amino-4-ethenyl-2,2,6,7-tetramethyl-1-benzofuran-3(2H)-oneAusbeute 91 %

Reagenzien, Katalysatoren, Lösungsmittel 4

HCID 702EthanolLösungsmittelHCID 962WaterLösungsmittel2×HCID 80711,2-DimethoxyethaneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Reaktionsbedingungen

Temperatur
100 °C

Versuchsvorschrift

2-ethenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolan (3.79 g, 24.6 mmol), tetrakistriphenyl phosphine palladium (605 mg, 0.523 mmol), sodium carbonate (1.36 g, 12.8 mmol), water (8 mL) and ethanol (5 mL) were added to a solution of DME (14 mL) containing 5-amino-4-bromo-2,2,6,7-tetramethyl-1-benzofuran-3(2H)-one (2.00 g, 7.04 mmol) synthesized in Reference Example 21, and the mixture was stirred under argon atmosphere at 100° C. for 45 hours. After cooled to room temperature, water was added to the mixture, and extraction was performed using ethyl acetate. It was dried using anhydrous magnesium sulfate. After that, the solvent was removed under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate: 98:2 to 85:15) to give 1.47 g of the title compound (yield: 91%).

Aufarbeitung

  1. customsynthesized in Reference Example 21
  2. temperatureAfter cooled to room temperature
  3. customIt was dried
  4. customAfter that, the solvent was removed under reduced pressure
  5. customthe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate: 98:2 to 85:15)

Quellen und Nachweise

ORD-Eintrag
ord-6425e6d07076452094f84243459d932a
Quelldatensatz
uspto-grants-2015_02
Patentnummer
US08957069B2

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