3-Pyridinecarboxaldehyde → 5-Oxo-1-(3-pyridinylmethyl)proline

HRID 2238546Notes

Reaction equation

HRID 2238546 reaction equation
[NH2:1][C@@H:2]([C:8]([OH:10])=[O:9])[CH2:3][CH2:4][C:5]([OH:7])=O.[OH-].[Na+].[N:13]1[CH:18]=[CH:17][CH:16]=[C:15]([CH:19]=O)[CH:14]=1.[BH4-].[Na+]>C(O)C>[O:7]=[C:5]1[N:1]([CH2:19][C:15]2[CH:14]=[N:13][CH:18]=[CH:17][CH:16]=2)[C@H:2]([C:8]([OH:10])=[O:9])[CH2:3][CH2:4]1

Participants

6

Reactant 4

HCID 103713-PyridinecarboxaldehydeHCID 14798Sodium HydroxideHCID 23327D-Glutamic AcidHCID 4311764Sodium borohydride

Product 1

HCID 105368875-Oxo-1-(3-pyridinylmethyl)prolineYield 61.8%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

D-glutamic acid (2.21 g, 15 mmol) was dissolved in 2N aqueous sodium hydroxide (15 ml, 30 mmol) at 0° C. and then treated with pyridine-3-carboxaldehyde (1.41 ml, 15 mmol) in ethanol (3 ml). The mixture was stirred at room temperature for 30 minutes and then cooled to 0° C. and treated portion-wise with sodium borohydride (0.189 g, 5 mmol). The mixture was allowed to warm to room temperature with stirring over 4 hrs then after washing with diethyl ether it was acidified to pH5-6 using concentrated hydrochloric acid. The resulting precipitate was collected by filtration, washed with diethyl ether, and dried in vacuo. This material was then taken up in ethanol (50 ml) and refluxed overnight. Fine solids were removed by filtration and then concentration gave 5-oxo-1-(3-pyridinylmethyl)proline (2.04 g) as a white solid which was used without any further purification.

Workup

  1. temperaturecooled to 0° C.
  2. temperatureto warm to room temperature
  3. stirringwith stirring over 4 hrs
  4. washafter washing with diethyl ether it
  5. filtrationThe resulting precipitate was collected by filtration
  6. washwashed with diethyl ether
  7. customdried in vacuo
  8. temperaturerefluxed overnight
  9. customFine solids were removed by filtration
  10. concentrationconcentration

Sources & evidence

ORD record
ord-08b6525927b24a1cbf1cdbb5737e86e7
Source dataset
uspto-grants-2010_05
Patent number
US07718693B2

Reaction notes

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