Trifluoroacetic acid → (R)-Hexahydropyrrolo[1,2-a]pyrazin-3(4H)-one

HRID 2074831Notes

Reaction equation

HRID 2074831 reaction equation
ClC[C:3]([NH:5][CH2:6][C@H:7]1[CH2:11][CH2:10][CH2:9][N:8]1[C:12](OC(C)(C)C)=O)=[O:4].C(O)(C(F)(F)F)=O.C(=O)([O-])[O-].[Na+].[Na+]>C(Cl)Cl>[CH2:6]1[NH:5][C:3](=[O:4])[CH2:12][N:8]2[CH2:9][CH2:10][CH2:11][C@H:7]12

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 10340Sodium CarbonateHCID 592157991,1-Dimethylethyl (2R)-2-{[(chloroacetyl)amino]methyl}-1-pyrrolidinecarboxylate

Product 1

HCID 55300705(R)-Hexahydropyrrolo[1,2-a]pyrazin-3(4H)-one

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
60 °C

Procedure

1,1-Dimethylethyl (2R)-2-{[(chloroacetyl)amino]methyl}-1-pyrrolidinecarboxylate (D13; 1.24 g, 4.5 mmol), was dissolved in 20 ml of DCM and treated with TFA (5 ml) at room temperature. After 1 h complete conversion into the desired material was observed and the reaction mixture was loaded onto a SCX cartridge. The product obtained after elution with 2M NH3 in MeOH was then dissolved in acetonitrile (30 ml) and treated with sodium carbonate (1.43 g, 10.34 mmol). The reaction mixture was heated at 60° C. for 6 hours; the crude obtained after removal is purified by flash-chromatography eluting with dichloromethane/MeOH 95/5 affording 250 mg of the desired compound.

Workup

  1. customThe product obtained
  2. washafter elution with 2M NH3 in MeOH
  3. dissolutionwas then dissolved in acetonitrile (30 ml)
  4. customthe crude obtained
  5. customafter removal
  6. customis purified by flash-chromatography
  7. washeluting with dichloromethane/MeOH 95/5 affording 250 mg of the desired compound

Sources & evidence

ORD record
ord-8891bf96b92448828149324c5a5151af
Source dataset
uspto-grants-2011_04
Patent number
US07919491B2

Reaction notes

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