1-Piperazinecarboxylic acid, ethyl ester → HCID 178473366, compound

HRID 890399Notes

Reaction equation

HRID 890399 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:16]([OH:18])=O)[CH2:10][C:11]1[N:15]=[CH:14][NH:13][CH:12]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH2:19]([O:21][C:22]([N:24]1[CH2:29][CH2:28][NH:27][CH2:26][CH2:25]1)=[O:23])[CH3:20].CCN=C=NCCCN(C)C.Cl.C1C=CC2N(O)N=NC=2C=1>C1COCC1.C(OCC)(=O)C>[CH2:19]([O:21][C:22]([N:24]1[CH2:25][CH2:26][N:27]([C:16]([CH:9]([NH:8][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:10][C:11]2[N:15]=[CH:14][NH:13][CH:12]=2)=[O:18])[CH2:28][CH2:29]1)=[O:23])[CH3:20]

Participants

7

Reactant 4

HCID 84311-Piperazinecarboxylic acid, ethyl esterHCID 757711-HydroxybenzotriazoleHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 178454169HCID 178454169, compound

Product 1

HCID 178473366HCID 178473366, compound

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of N-t-butoxycarbonylhistidine (2 g, 7.05 mmol) in THF (30 mL) was added 1-ethoxycarbonylpiperazine (1.36 mL, 1.3 eq.), EDCl (1.65 g, 1.2 eq.), HOBt (1.2 g, 1.1 eq.) and the reaction mixture was stirred overnight. The reaction mixture was evaporated in vacuo to afford a crude product, which was dissolved in ethyl acetate, washed with saturated NaHCO3, 1M NaHSO4 and brine. The organic layer was evaporated. Flash column chromatography with 2%–6% MeOH in CH2Cl2 afforded 4-ethoxycarbonyl-1-(1-(t-butoxycarbonyl)amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine (820 mg). 4-Ethoxycarbonyl-1-(1-(t-butoxycarbonyl)amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine (200 mg, 0.5 mmol) was treated with trifluoroacetic acid/methylene chloride (1:1, 2.0 mL) with stirring at ambient temperture for 1 hour. Evaporation gave 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine, which was treated with methylene chloride and triethylamine (0.5 mL), and the solvents evaporated to again afford 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine. To a solution of 2-carboxy-4-methoxyquinoline (124 mg, 0.61 mmol) in THF (4 mL) was added a mixture of 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine, THF (2 mL), and triethylamine (0.1 mL), followed by addition of EDCl (136 mg, 1.4 eq.), HOBt (98 mg, 1.4 eq.). The resulting mixture was stirred overnight. The crude product (245 mg, foam) was isolated from the reaction mixture by the same methods employed above. Flash column chromatography with 25%–6% MeOH in methylene chloride afforded 2-[1-(4-(ethoxycarbonyl)piperazin-1-yl)carbonyl-2-(imidazol-4-yl)ethyl]aminocarbonyl-4-methoxyquinoline; NMR (CDCl3) 1.25 (t, 3), 3.10–3.30 (m, 2), 3.20–3.65 (m, 9), 4.10 (m, 5), 5.40 (m, 1), 6.90 (s, 1), 7.55–7.60 (m, 3), 7.70 (t, 1), 8.02 (d, 1), 8.20 (d, 1), 9.0 (d, 1) ppm.

Workup

  1. customThe reaction mixture was evaporated in vacuo
  2. customto afford a crude product, which
  3. washwashed with saturated NaHCO3, 1M NaHSO4 and brine
  4. customThe organic layer was evaporated

Sources & evidence

ORD record
ord-4813c1b59b9048809e0cb77f05a7ce5e
Source dataset
uspto-grants-2006_02
Patent number
US06995156B2

Reaction notes

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