Tert-butyl 3-oxopiperazine-1-carboxylate → HCID 23447455, compound

HRID 2186167Notes

Reaction equation

HRID 2186167 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([CH:17]=[CH:18][C:19]([O:21][CH3:22])=[O:20])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:23]([O:27][C:28]([N:30]1[CH2:35][CH2:34][NH:33][C:32](=[O:36])[CH2:31]1)=[O:29])([CH3:26])([CH3:25])[CH3:24].CC(C)([O-])C.[K+]>O1CCCC1.C(OCC)(=O)C>[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([CH:17]([N:33]2[CH2:34][CH2:35][N:30]([C:28]([O:27][C:23]([CH3:25])([CH3:24])[CH3:26])=[O:29])[CH2:31][C:32]2=[O:36])[CH2:18][C:19]([O:21][CH3:22])=[O:20])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 3157178Tert-butyl 3-oxopiperazine-1-carboxylateHCID 23665647Potassium tert-butoxideHCID 53742494Methyl 3-(1-benzyloxycarbonylpiperidin-4-yl)acrylate

Product 1

HCID 23447455HCID 23447455, compoundYield 59.9%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of methyl 3-(1-benzyloxycarbonylpiperidin-4-yl)acrylate (5.55 g) and 4-(tert-butoxycarbonyl)-2-piperazinone (3.66 g) in tetrahydrofuran (50 ml) was added potassium tert-butoxide (0.56 g), and the mixture was stirred under nitrogen atmosphere at room temperature for 3 days. The reaction solution was diluted with ethyl acetate (50 ml), washed with 0.5N hydrochloric acid and saturated brine, dried and concentrated, and the residue was purified with silica gel column chromatography (eluent:acetone/hexane=1/2) to give colorless amorphous of methyl 3-(1-benzyloxycarbonylpiperidin-4-yl)-3-[4-(tert-butoxycarbonyl)-2-oxopiperazine-1-yl]propionate (5.51 g).

Workup

  1. washwashed with 0.5N hydrochloric acid and saturated brine
  2. customdried
  3. concentrationconcentrated
  4. customthe residue was purified with silica gel column chromatography (eluent:acetone/hexane=1/2)

Sources & evidence

ORD record
ord-270a588224f746238f370f45a02349c5
Source dataset
uspto-grants-2002_06
Patent number
US06403595B1

Reaction notes

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