Benzyl Bromide → Benzyl 2-benzyl-3-oxopiperidine-1-carboxylate

HRID 970409Notes

Reaction equation

HRID 970409 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH2:14][C:13](=[O:17])[CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.N1CCCC1.[CH2:23](Br)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1>C1(C)C=CC=CC=1.C(#N)C>[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH2:14][C:13](=[O:17])[CH:12]1[CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 7498Benzyl BromideHCID 31268PyrrolidineHCID 15141691-Benzyloxycarbonyl-3-piperidone

Product 1

HCID 23509685Benzyl 2-benzyl-3-oxopiperidine-1-carboxylateYield 6.3%

Reagents, catalysts & solvents 2

HCID 1140TolueneSolventHCID 6342AcetonitrileSolvent

Procedure

A stirring solution of N-(benzyloxycarbonyl)-3-piperidone (1000 mg, 4.25 mmol) and pyrrolidine (454 mg, 6.38 mmol, Aldrich) in dry toluene (10 mL) in a round bottom flask fitted with a Dean-Stark trap was refluxed for 4 h. The reaction was conc. in vacuo to a orange oil. The oil was dissolved in dry acetonitrile (10 mL) and then benzyl bromide (800 mg, 4.68 mmol, Aldrich) was added. The reaction was heated to reflux for 16 h and then cooled to room temperature. The reaction was quenched by the addition of 1M HCl (50 mL) and then extracted with EtOAc (4×40 mL). The organic layers were combined, washed with brine, dried over Na2SO4, and conc. in vacuo to an oil. The oil was purified by flash chromatography (SiO2, 7–20% EtOAc in hexanes) to yield 86 mg of the product as a white solid. MS (ESI) 324 (M+H).

Workup

  1. temperaturewas refluxed for 4 h
  2. temperatureThe reaction was heated
  3. temperatureto reflux for 16 h
  4. customThe reaction was quenched by the addition of 1M HCl (50 mL)
  5. extractionextracted with EtOAc (4×40 mL)
  6. washwashed with brine
  7. dry with materialdried over Na2SO4
  8. customThe oil was purified by flash chromatography (SiO2, 7–20% EtOAc in hexanes)

Sources & evidence

ORD record
ord-e3e223ea48a947e69044ad11263abaa3
Source dataset
uspto-grants-2007_12
Patent number
US07312222B2

Reaction notes

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