Reaktion #469893

Reaktionsgleichung

1-benzyl-4-methyl-4-phenylpiperidine

→

1-benzyl-4-methyl-4-phenylpiperidine

4-methyl-4-phenylpiperidine

Lösungsmittel

formic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe solid was filtered out
2. 2
   Waschenwashed with MeOH (30 mL), H2O (15 mL), CH2Cl2 (30 mL) and MeOH (15 mL)
3. 3
   EinengenThe combined filtrate and washings were concentrated
4. 4
   workup.DISSOLUTIONthe residue was dissolved in CH2Cl2 (50 mL)
5. 5
   workup.ADDITIONThe aqueous phase was adjusted to pH 11 by addition of 1 N aqueous NaOH
6. 6
   SonstigeThe organic phase was separated
7. 7
   Trocknendried over MgSO4
8. 8
   Einengenconcentrated
9. 9
   SonstigeThe residual oil was purified by flash chromatography (SiO2, CHCl3—MeOH—NH3 (2.0 M in MeOH) 100:4:0 to 100:20:10)

Vorschrift

Freshly prepared methanolic formic acid solution (4.4% by weight, 70 mL) was added to 1-benzyl-4-methyl-4-phenylpiperidine (3.23 g, 12.2 mmol, 1.00 equiv). To the resulting solution was added palladium on carbon (10% Pd, 2.00 g). The mixture was stirred at room temperature for 24 hours. The solid was filtered out and washed with MeOH (30 mL), H2O (15 mL), CH2Cl2 (30 mL) and MeOH (15 mL). The combined filtrate and washings were concentrated, and the residue was dissolved in CH2Cl2 (50 mL) and H2O (10 mL). The aqueous phase was adjusted to pH 11 by addition of 1 N aqueous NaOH. The organic phase was separated, dried over MgSO4 and concentrated. The residual oil was purified by flash chromatography (SiO2, CHCl3—MeOH—NH3 (2.0 M in MeOH) 100:4:0 to 100:20:10) to afford 1.20 g of 1-benzyl-4-methyl-4-phenylpiperidine and 1.10 g (51%, 82% based on unrecovered starting material) of 4-methyl-4-phenylpiperidine, which was characterized spectroscopically.

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