Monobenzone → tert-Butyl 4-[2-[4-(Benzyloxy)phenoxy]ethyl]piperidine-1-carboxylate

HRID 2095438Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2095438
Br[CH2:2][CH2:3][CH:4]1[CH2:9][CH2:8][N:7]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:6][CH2:5]1.[CH2:17]([O:24][C:25]1[CH:30]=[CH:29][C:28]([OH:31])=[CH:27][CH:26]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.C([O-])([O-])=O.[K+].[K+]>CC(C)=O.CCOC(C)=O>[CH2:17]([O:24][C:25]1[CH:26]=[CH:27][C:28]([O:31][CH2:2][CH2:3][CH:4]2[CH2:9][CH2:8][N:7]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:6][CH2:5]2)=[CH:29][CH:30]=1)[C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1

Komponenten

6

Edukt 3

HCID 7638MonobenzoneHCID 11430Potassium CarbonateHCID 10541625tert-Butyl 4-(2-bromoethyl)piperidine-1-carboxylate

Produkt 1

HCID 59371402tert-Butyl 4-[2-[4-(Benzyloxy)phenoxy]ethyl]piperidine-1-carboxylateAusbeute 73 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 180AcetoneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

A solution/suspension of tert-butyl 4-(2-bromoethyl)piperidine-1-carboxylate (1.22 g, 4.18 mmol), 4-(benzyloxy)phenol (1.01 g, 5.04 mmol, 1.20 equiv.), K2CO3 (830 mg, 6.01 mmol, 1.40 equiv.) and KI (75 mg, 0.45 mmol, 0.11 equiv.) in acetone was heated to reflux under N2 overnight. After cooling to room temperature, the mixture was diluted with 100 mL of EtOAc, and the solids were filtered off. The filtrate was concentrated under vacuum, and the residue was applied onto a silica gel column, which was eluted with ethyl acetate/petroleum ether (1:5) to afford the product (1.25 g, 73%) as a white solid. 1H NMR (CDCl3, 300 MHz) δ 7.43-7.29 (m, 5H), 6.90 (d, 2H, J=6.6 Hz), 5.01 (s, 2H), 4.08 (d, 2H, J=7.2 Hz), 3.95 (t, 1H, J=4.2 Hz), 2.70 (t, 2H, J=9.6 Hz), 1.71-1.69 (m, 5H), 1.45 (s, 9H), 1.20-1.15 (m, 2H). LC-MS (ESI) m/z 434 (M+Na+).

Aufarbeitung

  1. temperaturewas heated
  2. temperatureto reflux under N2 overnight
  3. filtrationthe solids were filtered off
  4. concentrationThe filtrate was concentrated under vacuum
  5. washwas eluted with ethyl acetate/petroleum ether (1:5)

Quellen und Nachweise

ORD-Eintrag
ord-69dbba93b05848e9b96d6d35e5ff03c6
Quelldatensatz
uspto-grants-2013_05
Patentnummer
US08445684B2

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