4-Piperidinecarboxylic acid → 1-Carbobenzoxy-4-piperidinecarboxylic Acid

HRID 1185699Notes

Reaction equation

HRID 1185699 reaction equation
[NH:1]1[CH2:6][CH2:5][CH:4]([C:7]([OH:9])=[O:8])[CH2:3][CH2:2]1.[OH-].[Na+].[C:12](Cl)([O:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)=[O:13]>O>[CH2:15]([O:14][C:12]([N:1]1[CH2:6][CH2:5][CH:4]([C:7]([OH:9])=[O:8])[CH2:3][CH2:2]1)=[O:13])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

5

Reactant 3

HCID 37734-Piperidinecarboxylic acidHCID 10387Benzyl chloroformateHCID 14798Sodium Hydroxide

Product 1

HCID 7364891-Carbobenzoxy-4-piperidinecarboxylic AcidYield 91.2%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
0 °C

Procedure

Piperidine-4-carboxylic acid (64.8 g, 0.5 mol) in H2O (50 mL) was treated with NaOH (44.0 g, 1.1 mol). The reaction mixture was cooled to 0° C. and treated with CbzCl (93.8 g, 0.55 mol). The reaction mixture was stirred at ambient temperature for 4 hours and the mixture was extracted with Et2O (3 150 mL). The aqueous phase was acidified with 6 N HCl (140 mL) and extracted with EtOAc (3 200 mL). The solution was dried over MgSO4, filtered, and concentrated to afford crude piperidine-1,4-dicarboxylic acid monobenzyl ester (120 g), which was used without further purification: MS (ESI) m/z 262 [M−H]+.

Workup

  1. extractionthe mixture was extracted with Et2O (3 150 mL)
  2. extractionextracted with EtOAc (3 200 mL)
  3. dry with materialThe solution was dried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-f9c12452c5aa4777a0d2ff9f24e6614f
Source dataset
uspto-grants-2014_03
Patent number
US08669234B2

Reaction notes

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