Tetrahydrofuran → Benzyl ethyl piperidine-1,3-dicarboxylate

HRID 1034717Notes

Reaction equation

HRID 1034717 reaction equation
[C:1](Cl)(=[O:10])[O:2][CH2:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[NH:12]1[CH2:17][CH2:16][CH2:15][CH:14]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:13]1.C([O-])([O-])=O.[K+].[K+].C1COCC1>CCOCC.O>[N:12]1([C:1]([O:2][CH2:3][C:4]2[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=2)=[O:10])[CH2:17][CH2:16][CH2:15][CH:14]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:13]1

Participants

7

Reactant 4

HCID 8028TetrahydrofuranHCID 10387Benzyl chloroformateHCID 11430Potassium CarbonateHCID 98969Ethyl nipecotate

Product 1

HCID 17999271Benzyl ethyl piperidine-1,3-dicarboxylateYield 86.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 3283Diethyl EtherSolvent

Procedure

Benzyl carbonochloridate (4.5 mL, 31.7 mmol) at 0° C. was added to ethyl piperidine-3-carboxylate (5.0 g, 30.2 mmol) and K2CO3 (4.2 g, 30.2 mmol) in 1:1 THF:water (100 mL). The reaction mixture was stirred at room temperature for 2 hours, and then ether (50 mL) was added. The organic layer was separated, washed with brine and dried over sodium sulfate. After removal of the solvent, the residue was purified by chromatography on silica gel (hexane:ethyl acetate, 5:1) to give 1-benzyl 3-ethyl piperidine-1,3-dicarboxylate (7.60 g 86% yield) as an oil.

Workup

  1. customThe organic layer was separated
  2. washwashed with brine
  3. dry with materialdried over sodium sulfate
  4. customAfter removal of the solvent
  5. customthe residue was purified by chromatography on silica gel (hexane:ethyl acetate, 5:1)

Sources & evidence

ORD record
ord-66514165eb20462eaa8d464aaaa350b8
Source dataset
uspto-grants-2013_10
Patent number
US08545897B2

Reaction notes

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