Potassium Carbonate → 4-Bromo-3-{[(2,4-dimethoxy-benzyl)-methoxycarbonylmethyl-amino]-methyl}-thiophene-2-carboxylic acid methyl ester

HRID 2368735Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2368735
[CH3:1][O:2][C:3]([C:5]1[S:6][CH:7]=[C:8]([Br:12])[C:9]=1[CH2:10]Br)=[O:4].[CH2:13]([O:15][C:16](=[O:30])[CH2:17][NH:18][CH2:19][C:20]1[CH:25]=[CH:24][C:23]([O:26][CH3:27])=[CH:22][C:21]=1[O:28][CH3:29])C.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O.C(OCC)(=O)C>[CH3:1][O:2][C:3]([C:5]1[S:6][CH:7]=[C:8]([Br:12])[C:9]=1[CH2:10][N:18]([CH2:19][C:20]1[CH:25]=[CH:24][C:23]([O:26][CH3:27])=[CH:22][C:21]=1[O:28][CH3:29])[CH2:17][C:16]([O:15][CH3:13])=[O:30])=[O:4]

Komponenten

6

Edukt 3

HCID 11430Potassium CarbonateHCID 19895532Ethyl 2-(2,4-dimethoxybenzylamino)acetateHCID 67233904Methyl 4-bromo-3-(bromomethyl)thiophene-2-carboxylate

Produkt 1

HCID 672333554-Bromo-3-{[(2,4-dimethoxy-benzyl)-methoxycarbonylmethyl-amino]-methyl}-thiophene-2-carboxylic acid methyl esterAusbeute 92,1 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6228DimethylformamideLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

4-Bromo-3-bromomethyl-thiophene-2-carboxylic acid methyl ester (2.28 g, 7.31 mmol), example 31-b, was dissolved in 18 mL of dry N,N-dimethylformamide. N-(2,4-dimethoxy-benzyl)glycine ethyl ester (1.75 g, 7.31 mmol) and potassium carbonate (1.11 g, 8.04 mmol) were added and the reaction mixture was stirred at room temperature for 18 hours. The reaction mixture was diluted with ethyl acetate and washed with water and brine. The organic fraction was dried over anhydrous sodium sulfate, and concentrated. The crude product was purified by flash chromatography eluting from silica gel with a gradient of 0-60% ethyl acetate in hexanes to produce 3.18 g of a tan oil. MS: (+) m/z 494.1, 496.1 (M+Na+, 79Br/81Br).

Aufarbeitung

  1. washwashed with water and brine
  2. dry with materialThe organic fraction was dried over anhydrous sodium sulfate
  3. concentrationconcentrated
  4. customThe crude product was purified by flash chromatography
  5. washeluting from silica gel with a gradient of 0-60% ethyl acetate in hexanes

Quellen und Nachweise

ORD-Eintrag
ord-870ce5b7574c4984beca4c70b7bd4735
Quelldatensatz
uspto-grants-2014_04
Patentnummer
US08703795B2

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