Cesium carbonate → 4-(Cyclopropanecarbonyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester

HRID 29297

Reaktionsgleichung

Reaktionsgleichung von HRID 29297
[CH2:1]([O:3][C:4]([C:6]1[O:7][C:8]2[CH:15]=[CH:14][CH:13]=[C:12](OS(C(F)(F)F)(=O)=O)[C:9]=2[C:10]=1[CH3:11])=[O:5])[CH3:2].[CH:24]1([C:27]([NH2:29])=[O:28])[CH2:26][CH2:25]1.C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[CH2:1]([O:3][C:4]([C:6]1[O:7][C:8]2[CH:15]=[CH:14][CH:13]=[C:12]([NH:29][C:27]([CH:24]3[CH2:26][CH2:25]3)=[O:28])[C:9]=2[C:10]=1[CH3:11])=[O:5])[CH3:2]

Komponenten

7

Edukt 4

HCID 10796Cesium carbonateHCID 80376CyclopropanecarboxamideHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 865990263-Methyl-4-trifluoromethanesulfonyloxy-benzofuran-2-carboxylic acid ethyl ester

Produkt 1

HCID 687160824-(Cyclopropanecarbonyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl esterAusbeute 98 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 9811564Bis(dibenzylideneacetone)palladiumKatalysatorHCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

To 3-methyl-4-trifluoromethanesulfonyloxy-benzofuran-2-carboxylic acid ethyl ester (300 mg, 0.85 mmol, 1 eq, prepared according to Example 20, Step 1) in 8 mL of dioxane under nitrogen were added cyclopropyl carboxamide (87 mg, 1.02 mmol, 1.2 eq), Pd2 (dba)3 (16 mg, 0.017 mmol, 0.02 eq), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (30 mg, 0.051 mmol, 0.06 eq), and cesium carbonate (390 mg, 1.19 mmol, 1.4 eq). The reaction mixture was heated at reflux for 72 h. After work up and column chromatography (dichloromethane/hexanes), 4-(cyclopropanecarbonyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester was obtained in 98% yield (238 mg). 1H NMR (400 MHz, DMSO-d6) δ ppm 0.8 (m, 4 H) 1.3 (t, J=7.1 Hz, 3 H) 1.8 (s, 1 H) 2.6 (s, 3 H) 4.4 (q, J=7.2 Hz, 2 H) 7.2 (d, J=7.1 Hz, 1 H) 7.5 (m, 1 H) 7.5 (m, 1 H) 10.1 (s, 1 H).

Aufarbeitung

  1. temperatureThe reaction mixture was heated
  2. temperatureat reflux for 72 h

Quellen und Nachweise

ORD-Eintrag
ord-6cb6a804429c49f08029e7b531d8aa19
Quelldatensatz
uspto-grants-2008_09
Patentnummer
US07420001B2

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