Acetic Acid → [1-(3-Ethoxy-4-methoxy-benzyl)-piperidin-4-yl]-carbamic acid tert-butyl ester

HRID 2242948

Reaktionsgleichung

Reaktionsgleichung von HRID 2242948
[C:1]([O:5][C:6](=[O:14])[NH:7][CH:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1)([CH3:4])([CH3:3])[CH3:2].[CH2:15]([O:17][C:18]1[CH:19]=[C:20]([CH:23]=[CH:24][C:25]=1[O:26][CH3:27])[CH:21]=O)[CH3:16].C(O)(=O)C.C([BH3-])#N.[Na+]>C(O)C>[C:1]([O:5][C:6](=[O:14])[NH:7][CH:8]1[CH2:13][CH2:12][N:11]([CH2:21][C:20]2[CH:23]=[CH:24][C:25]([O:26][CH3:27])=[C:18]([O:17][CH2:15][CH3:16])[CH:19]=2)[CH2:10][CH2:9]1)([CH3:4])([CH3:2])[CH3:3]

Komponenten

6

Edukt 4

HCID 176Acetic AcidHCID 2447283-Ethoxy-4-methoxybenzaldehydeHCID 7238334-(N-Boc-amino)piperidineHCID 5003444Sodium cyanoborohydride

Produkt 1

HCID 67147361[1-(3-Ethoxy-4-methoxy-benzyl)-piperidin-4-yl]-carbamic acid tert-butyl esterAusbeute 53 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel2×

Reaktionsbedingungen

Temperatur
100 °C

Versuchsvorschrift

A mixture of piperidin-4-yl-carbamic acid tert-butyl ester (10.0 g, 50.0 mmol, 1.0 equiv), 3-ethoxy-4-methoxy-benzaldehyde (10.8 g, 60.0 mmol, 1.2 equiv; commercially available) and acetic acid (11.4 mL, 12.01 g, 200.0 mmol, 4.0 equiv) in ethanol (40 mL) was heated by microwave irradiation to 100° C. for 5 min. Sodium cyanoborohydride (6.27 g, 100.0 mmol, 2.0 equiv), dissolved in ethanol (20 mL), was added and the reaction mixture heated by microwave irradiation to 100° C. for an additional time period of 5 min. The solvent was removed under reduced pressure and the crude reaction product extracted from a solution of 1 M NaOH (200 mL) with ethyl acetate (3×100 mL). The combined organic phases were dried over MgSO4, concentrated by evaporation under reduced pressure and the crude material purified with column chromatography on silica eluting with ethyl acetate to yield 9.71 g (53%) of the title compound as a white solid. MS (ISP): 365.3 [M+H]+.

Aufarbeitung

  1. additionwas added
  2. customThe solvent was removed under reduced pressure
  3. customthe crude reaction product
  4. extractionextracted from a solution of 1 M NaOH (200 mL) with ethyl acetate (3×100 mL)
  5. dry with materialThe combined organic phases were dried over MgSO4
  6. concentrationconcentrated by evaporation under reduced pressure
  7. customthe crude material purified with column chromatography on silica eluting with ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-89c5b060abfb4b89a658be4d2b1d78f9
Quelldatensatz
uspto-grants-2010_03
Patentnummer
US07674804B2

Verknüpfte Notizen

Wird geladen…