Reaktion #469892

Reaktionsgleichung

NaOH

1-Benzyl-4-methyl-piperidin-4-ol

AlCl3

→

brown oil

Ausbeute 104.0%

1-Benzyl-4-methyl-4-phenylpiperidine

Ausbeute 104.0%

Lösungsmittel

benzene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturat reflux for 24 hours
2. 2
   Temperaturcooled
3. 3
   Extraktionextracted with EtOAc (3×100 mL)
4. 4
   TrocknenThe combined organic solutions were dried over MgSO4
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe residue was purified by flash chromatography (SiO2, hexane-Et2O 19:1 to 9:1 followed by hexane-EtOAc 3:1)

Vorschrift

1-Benzyl-4-methyl-piperidin-4-ol (4.81 g, 23.4 mmol, 1.00 equiv) was added to a suspension of AlCl3 (15.62 g, 117 mmol, 5.00 equiv) in benzene (100 mL) at room temperature under argon. The mixture was stirred at reflux for 24 hours, then cooled and poured cautiously into ice water (100 g of ice plus 50 mL of water). The aqueous phase was adjusted to pH 11-12 by addition of 6 N aqueous NaOH at 0° C., and extracted with EtOAc (3×100 mL). The combined organic solutions were dried over MgSO4 and concentrated. The residue was purified by flash chromatography (SiO2, hexane-Et2O 19:1 to 9:1 followed by hexane-EtOAc 3:1) to give 3.23 g (52%) of brown oil, which was characterized, spectroscopically.

Quelle