Piperazine → Methyl 6-piperazinonicotinate

HRID 1637175Notes

Reaction equation

HRID 1637175 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][C:8](Br)=[N:9][CH:10]=1)=[O:4].[NH:12]1[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]1>C(#N)C>[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][C:8]([N:12]2[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]2)=[N:9][CH:10]=1)=[O:4]

Participants

4

Reactant 2

HCID 4837PiperazineHCID 13349623Methyl 6-bromopyridine-3-carboxylate

Product 1

HCID 14987928Methyl 6-piperazinonicotinateYield 56%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

A mixture of 2-bromopyridine-5-carboxylic acid methyl ester (1.40 g, 6.5 mmol) and piperazine (5.59 g, 65 mmol) was dissolved in acetonitrile (50 ml) and heated at reflux temperature for 2.5 h. The reaction mixture was concentrated in vacuo, dissolved in dichloromethane (50 ml) and extracted with water (3×50 ml). The organic solution was dried (MgSO4) and evaporated in vacuo, affording 0.80 g (56%) of 2-(1-piperazinyl)-5-pyridinecarboxylic acid methyl ester.

Workup

  1. temperatureheated
  2. temperatureat reflux temperature for 2.5 h
  3. concentrationThe reaction mixture was concentrated in vacuo
  4. dissolutiondissolved in dichloromethane (50 ml)
  5. extractionextracted with water (3×50 ml)
  6. dry with materialThe organic solution was dried (MgSO4)
  7. customevaporated in vacuo

Sources & evidence

ORD record
ord-b01b595f705546a0a1b2998874e376b1
Source dataset
uspto-grants-2000_03
Patent number
US06040302

Reaction notes

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