Benzyl Bromide → Ethyl 3-(3-(benzyloxy)phenyl)-2-(tert-butoxycarbonylamino)propanoate

HRID 1397866Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1397866
[C:1]([O:5][C:6]([NH:8][CH:9]([CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([OH:22])[CH:17]=1)[C:10]([O:12][CH2:13][CH3:14])=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+].[CH2:29](Br)[C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1>CC(C)=O>[CH2:29]([O:22][C:18]1[CH:17]=[C:16]([CH2:15][CH:9]([NH:8][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[C:10]([O:12][CH2:13][CH3:14])=[O:11])[CH:21]=[CH:20][CH:19]=1)[C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1

Komponenten

5

Edukt 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 68334566Ethyl 2-(tert-butoxycarbonylamino)-3-(3-hydroxyphenyl)propanoate

Produkt 1

HCID 71208957Ethyl 3-(3-(benzyloxy)phenyl)-2-(tert-butoxycarbonylamino)propanoateAusbeute 88 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 180AcetoneLösungsmittel

Versuchsvorschrift

158 (760 mg, 1 equivalent) was dissolved in 15 ml of acetone, then potassium carbonate (373 mg, 1.1 equivalent) and benzylbromide (1.1 équivalent, 323 μl) were added successively. The reaction mixture was let overnight at room temperature. The reaction mixture is concentrated and 50 ml of AcOEt are added. The organic phase are washed with 10% citric acid, saturated NaHCO3 and brine then dried over Na2SO4, filtered and concentrated. The crude product was purified by flash chromatography (AcOEt/Hexane 2/8) to afford 159 as white solid (860 mg, 88%). 1H NMR (CDCl3): δ 1.38 (t, 3H, J=7.4 Hz), 1.69 (s, 9H), 3.22 (m, 2H), 4.31 (q, 2H, J=7.4 Hz), 4.71 (s, 2H), 5.13 (m, 1H), 5.20 (s, 2H), 6.90 (d, 1H, J=7.1 Hz), 6.94 (s, 1H), 7.01 (d, 1H, J=8.2 Hz), 7.36 (t, 1H, J=7.7 Hz), 7.49 (m, 1H), 7.56 (m, 4H).

Aufarbeitung

  1. concentrationThe reaction mixture is concentrated
  2. addition50 ml of AcOEt are added
  3. washThe organic phase are washed with 10% citric acid, saturated NaHCO3 and brine
  4. dry with materialthen dried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude product was purified by flash chromatography (AcOEt/Hexane 2/8)

Quellen und Nachweise

ORD-Eintrag
ord-20c268dd148040fa9d86eb0babcf4b3a
Quelldatensatz
uspto-grants-2014_12
Patentnummer
US08901295B2

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