1-Hydroxybenzotriazole → HCID 23077841, compound

HRID 1442452Notes

Reaction equation

HRID 1442452 reaction equation
[C:1]([O:5][C:6]([NH:8][C:9]([CH3:14])([CH3:13])[C:10]([OH:12])=O)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH2:15]([O:22][C:23]([N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1)=[O:24])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.ON1C2C=CC=CC=2N=N1.Cl.C(N=C=NCCCN(C)C)C>O1CCCC1.O>[CH2:15]([O:22][C:23]([N:25]1[CH2:30][CH2:29][N:28]([C:10](=[O:12])[C:9]([NH:8][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])([CH3:14])[CH3:13])[CH2:27][CH2:26]1)=[O:24])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

7

Reactant 4

HCID 757711-HydroxybenzotriazoleHCID 643495Benzyl piperazine-1-carboxylateHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 2733845N-((1,1-dimethylethoxy)carbonyl)-2-methyl-alanine

Product 1

HCID 23077841HCID 23077841, compoundYield 67.7%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 2-(tert-butoxycarbonylamino)-2-methyl-propionic acid (10 g) in tetrahydrofuran (20 mL) were added 1-(benzyloxycarbonyl)piperazine (16.3 g), 1-hydroxybenzo-triazole (8.02 g) and 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (11.4 g), and the mixture was stirred at room temperature overnight. The reaction mixture was poured into water, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure. The residue was dissolved in a mixed solvent of n-hexane and ethyl acetate (1/1) (40 mL) at 60° C. with heating, and the solution was stirred at room temperature overnight. To the mixture was added the same solvent (30 mL), and the mixture was further stirred overnight. The precipitated crystals were collected by filtration, and washed with the same solvent and dried under reduced pressure to give 4-benzyloxycarbonyl-1-[2-(tert-butoxycarbonylamino)-2-methylpropionyl]piperazine (13.5 g). To a solution of the obtained 4-benzyloxycarbonyl-1-[2-(tert-butoxycarbonylamino)-2-methylpropionyl]-piperazine (5 g) in tetrahydrofuran (30 mL) was added hydrochloric acid (4 mol/L 1,4-dioxane solution, 40 mL), and the mixture was stirred at room temperature overnight. The precipitated crystals were collected by filtration. The obtained crystals were dissolved in ethyl acetate and a saturated aqueous sodium hydrogen carbonate solution. The organic layer was separated, and the organic layer was washed with brine and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure to give the title compound (3.65 g).

Workup

  1. extractionthe resulting mixture was extracted with ethyl acetate
  2. washThe extract was washed with water and brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. customThe solvent was removed under reduced pressure
  5. dissolutionThe residue was dissolved in a mixed solvent of n-hexane and ethyl acetate (1/1) (40 mL) at 60° C.
  6. temperaturewith heating
  7. stirringthe solution was stirred at room temperature overnight
  8. additionTo the mixture was added the same solvent (30 mL)
  9. waitthe mixture was further stirred overnight
  10. filtrationThe precipitated crystals were collected by filtration
  11. washwashed with the same solvent
  12. customdried under reduced pressure

Sources & evidence

ORD record
ord-a7d036cc266f42d7a128db7d7bbe4b22
Source dataset
uspto-grants-2010_02
Patent number
US07655632B2

Reaction notes

Loading…