Sodium Carbonate → HCID 70172846, Verbindung

HRID 1936987Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1936987
[C:1]([NH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1OB(O)O)(=[O:6])[C:2]([CH3:5])([CH3:4])[CH3:3].[CH3:18][O:19][C:20]([C:22]1[CH2:26][O:25][CH2:24][C:23]=1OS(C(F)(F)F)(=O)=O)=[O:21].C([O-])([O-])=O.[Na+].[Na+]>COCCOC.C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:18][O:19][C:20]([C:22]1[CH2:26][O:25][CH2:24][C:23]=1[C:9]1[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=1[NH:7][C:1](=[O:6])[C:2]([CH3:5])([CH3:4])[CH3:3])=[O:21]

Komponenten

7

Edukt 3

HCID 10340Sodium CarbonateHCID 21837982Methyl 4-(((trifluoromethyl)sulfonyl)oxy)-2,5-dihydrofuran-3-carboxylateHCID 22462508HCID 22462508, Verbindung

Produkt 1

HCID 70172846HCID 70172846, VerbindungAusbeute 87 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 178418397HCID 178418397, VerbindungKatalysatorHCID 80711,2-DimethoxyethaneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

2-(Pivaloylamino)phenylboric acid (F. Guiller, F. Nivoliers, A. Godard, F. Marsais, G. Quéguiner, M. A. Siddiqui, V. Snieckus, J. Org. Chem. 1995, 60, 292) (0.66 g, 3.0 mmol), 3-(trifluoromethylsulfonyloxy)-2,5-dihydrofuran-4-carboxylic acid-methyl ester (0.69 g, 2.5 mmol), tetrakis(triphenylphosphine)palladium (69 mg, 0.06 mmol) and a 2M aqueous Na2CO3 solution (1.26 ml, 2.52 mmol) are refluxed in DME (40 ml) for 2.5 hours. The batch is diluted with ethyl acetate, washed with water and saturated NaCl, dried (Na2SO4) and concentrated by evaporation in a vacuum. Column chromatography on silica gel with ethyl acetate-hexane yields 0.65 g (87%) of 4-(2-(pivaloylamino)phenyl)-2,5-dihydrofuran-3-carboxylic acid-methyl ester (flash point 105-6° C.). 0.59 g (1.94 mmol) of it is then refluxed in concentrated hydrochloric acid for 2 hours. The batch is poured onto ice and extracted with ethyl acetate and dichloromethane. After drying (Na2SO4) and concentration by evaporation, the residue is heated for two more hours with concentrated HCl and worked up as described: 0.22 g (58%) of product.

Aufarbeitung

  1. washwashed with water and saturated NaCl
  2. dry with materialdried (Na2SO4)
  3. concentrationconcentrated by evaporation in a vacuum

Quellen und Nachweise

ORD-Eintrag
ord-e8dcc4689c8545fc8e6206c17e394ddb
Quelldatensatz
uspto-grants-2002_05
Patentnummer
US06391887B1

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