Triethylamine → HCID 67098562, compound

HRID 2079336Notes

Reaction equation

HRID 2079336 reaction equation
[OH:1][C@H:2]([CH2:6][CH:7]([CH3:9])[CH3:8])[C:3]([OH:5])=O.C(N(CC)CC)C.C1C=CC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.Cl.[CH2:39]([O:46][C:47]([N:49]1[CH2:54][CH2:53][NH:52][CH2:51][CH2:50]1)=[O:48])[C:40]1[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=1>CN(C=O)C.CCOC(C)=O>[CH2:39]([O:46][C:47]([N:49]1[CH2:54][CH2:53][N:52]([C:3](=[O:5])[C@H:2]([OH:1])[CH2:6][CH:7]([CH3:9])[CH3:8])[CH2:51][CH2:50]1)=[O:48])[C:40]1[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=1

Participants

8

Reactant 5

HCID 8471TriethylamineHCID 757711-HydroxybenzotriazoleHCID 439960(R)-2-hydroxy-4-methylpentanoic acidHCID 643495Benzyl piperazine-1-carboxylateHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Product 1

HCID 67098562HCID 67098562, compoundYield 49%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To (R)-2-hydroxy-4-methyl-pentanoic acid (1.71 g, 12.9 mmol) in 48 mL of DMF was added sequentially triethylamine (4.9 mL, 35 mmol), HOBt (1.75 g, 12.9 mmol), EDCI.HCl (2.48 g, 12.9 mmol) and piperazine-1-carboxylic acid benzyl ester (2.59 g, 11.8 mmol) at room temperature. The reaction mixture was stirred for 4 h and then diluted with EtOAc (50 mL) and extracted with 50 mL of water. The organic layer was separated and dried over Na2SO4, and the solvent was removed under reduced pressure to give an oil. The residue was subjected to purification by normal phase LC using 40-85% EtOAc-hexanes to give (1.92 g, 49% yield) of 4-(2(R)-hydroxy-4-methyl-pentanoyl)-piperazine-1-carboxylic acid benzyl ester the desired product. LC/MS: m/z 335.4 (M+H)+ at 2.96 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)).

Workup

  1. extractionextracted with 50 mL of water
  2. customThe organic layer was separated
  3. dry with materialdried over Na2SO4
  4. customthe solvent was removed under reduced pressure
  5. customto give an oil
  6. customThe residue was subjected to purification by normal phase LC

Sources & evidence

ORD record
ord-8bf73c169a274d06bb68cb229712d68e
Source dataset
uspto-grants-2011_04
Patent number
US07928107B2

Reaction notes

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