1-Hydroxybenzotriazole → HCID 54291569, compound

HRID 1266964Notes

Reaction equation

HRID 1266964 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:13]([OH:15])=O)[CH:10]([CH3:12])[CH3:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[Cl:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[N:23]1[CH2:28][CH2:27][NH:26][CH2:25][CH2:24]1.Cl.C(N=C=NCCCN(C)C)C.ON1C2C=CC=CC=2N=N1>CN(C)C=O.ClCCl>[Cl:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[N:23]1[CH2:28][CH2:27][N:26]([C:13](=[O:15])[C@@H:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4])[CH:10]([CH3:11])[CH3:12])[CH2:25][CH2:24]1

Participants

7

Reactant 4

HCID 757711-HydroxybenzotriazoleHCID 83693Boc-L-ValineHCID 4156281-(2-Chlorophenyl)piperazineHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Product 1

HCID 54291569HCID 54291569, compound

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of N-tert-butoxycarbonyl-L-valine (2.27 g, 10 mmol) and 1-(2-chlorophenyl)piperazine (2.00 g, 10 mmol) in N,N-dimethylformamide (50 ml) under ice-cooling was dropwise added a solution of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (2.2 g, 11 mmol) and 1-hydroxybenzotriazole (1.5 g, 11 mmol) in dichloromethane (50 ml), and the reaction mixture was stirred at room temperature for 15 hours. The dichloromethane was then distilled off under reduced pressure and ethyl acetate (200 ml) was added to the residue. The ethyl acetate layer was washed successively with 10 w/v % aqueous citric acid solution, saturated aqueous sodium hydrogen carbonate solution, and saturated brine in the order mentioned and dried over anhydrous sodium sulfate. The solvent was then distilled off and the residue was subjected to silica gel chromatography. Elution with ethyl acetate-n-hexane (1:2, v/v) gave 1,1-dimethylethyl 2-(4-(2-chlorophenyl)piperazinyl)-2-oxo-(s)-1-(2-propyl)ethylcarbamate. This colorless oil was dissolved in ethyl acetate (50 ml), and 4N HCl/ethyl acetate (50 ml) was added dropwise under ice-cooling. The mixture was stirred at room temperature for 3 hours. The reaction product was filtered and washed with ethyl acetate-n-hexane (1:1, v/v) to give 1-((s)-2-amino-3-methyl-1-oxobutyl)-4-(2-chlorophenyl)piperazine hydrochloride (3.32 g, 95.8%) as colorless crystals.

Workup

  1. distillationThe dichloromethane was then distilled off under reduced pressure and ethyl acetate (200 ml)
  2. additionwas added to the residue
  3. washThe ethyl acetate layer was washed successively with 10 w/v % aqueous citric acid solution, saturated aqueous sodium hydrogen carbonate solution, and saturated brine in the order
  4. dry with materialdried over anhydrous sodium sulfate
  5. distillationThe solvent was then distilled off
  6. washElution with ethyl acetate-n-hexane (1:2

Sources & evidence

ORD record
ord-e837e90912f2495a869f6dbad325383c
Source dataset
uspto-grants-2003_04
Patent number
US06551999B1

Reaction notes

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