Triethylamine → 3,4-dichlorobenzyl-4-piperidone

HRID 1835261Notes

Reaction equation

HRID 1835261 reaction equation
Cl.[NH:2]1[CH2:7][CH2:6][C:5](=[O:8])[CH2:4][CH2:3]1.C(N(CC)CC)C.[Cl:16][C:17]1[CH:18]=[C:19]([CH:22]=[CH:23][C:24]=1[Cl:25])[CH2:20]Br>C(O)C>[Cl:16][C:17]1[CH:18]=[C:19]([CH:22]=[CH:23][C:24]=1[Cl:25])[CH2:20][N:2]1[CH2:7][CH2:6][C:5](=[O:8])[CH2:4][CH2:3]1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 6397264-(Bromomethyl)-1,2-dichlorobenzeneHCID 30848514-Piperidone hydrochloride

Product 1

HCID 108487763,4-dichlorobenzyl-4-piperidoneYield 81.9%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a suspension of 4-piperidone hydrochloride (3.52 g, 22.9 mmol) in ethanol (40 ml) was added triethylamine (10.8 ml, 91.6 mmol), followed by the addition of 3,4-dichlorobenzyl bromide (5.0 g, 20.8 mmol) and the reaction mixture was stirred overnight at room temperature. The reaction mixture was concentrated in vacuo and the residue was partitioned between water and ethyl acetate. The ethyl acetate layer was separated, washed with brine, dried over magnesium sulfate and concentrated in vacuo. Column chromatography with 25% ethyl acetate and 25% dichloromethane in hexanes gave 1-(3,4-dichlorobenzyl)-4-piperidone (4.4 g) as a colorless oil.

Workup

  1. concentrationThe reaction mixture was concentrated in vacuo
  2. customthe residue was partitioned between water and ethyl acetate
  3. customThe ethyl acetate layer was separated
  4. washwashed with brine
  5. dry with materialdried over magnesium sulfate
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-6741970a656945b29738014bb72cb437
Source dataset
uspto-grants-2004_08
Patent number
US06770650B2

Reaction notes

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