Bromopinacolone → (S)-2-{[5-(3,3-Dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-pentanedioic acid 5-tert-butyl ester 1-methyl ester

HRID 1908626Notes

Reaction equation

HRID 1908626 reaction equation
[CH3:1][O:2][C:3](=[O:29])[C@@H:4]([NH:14][C:15]([C:17]1[CH:21]=[C:20]([OH:22])[N:19]([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[N:18]=1)=[O:16])[CH2:5][CH2:6][C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8].[H-].[Na+].Br[CH2:33][C:34](=[O:39])[C:35]([CH3:38])([CH3:37])[CH3:36]>CN(C=O)C.[Cl-].[Na+].O>[CH3:1][O:2][C:3](=[O:29])[C@@H:4]([NH:14][C:15]([C:17]1[CH:21]=[C:20]([O:22][CH2:33][C:34](=[O:39])[C:35]([CH3:38])([CH3:37])[CH3:36])[N:19]([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[N:18]=1)=[O:16])[CH2:5][CH2:6][C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8]

Participants

6

Reactant 3

HCID 21642BromopinacoloneHCID 24758Sodium hydrideHCID 178501468HCID 178501468, compound

Product 1

HCID 66920060(S)-2-{[5-(3,3-Dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-pentanedioic acid 5-tert-butyl ester 1-methyl ester

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 57417360Sodium chloride; waterSolvent

Procedure

A solution of 6.5 g of (S)-2-[(5-Hydroxy-1-phenyl-1H-pyrazole-3-carbonyl)-amino]-pentanedioic acid 5-tert-butyl ester 1-methyl ester in 175 ml of DMF was cooled to 0° C. Then, 644 mg of sodium hydride (60% in mineral oil) was added portionwise over 20 min. Further 20 min after completion of the addition 2.9 g of 1-Bromo-3,3-dimethyl-butan-2-one was added and the reaction mixture was allowed to warm to RT. After striring for 16 h the reaction mixture was diluted with brine and extracted with DCM. The organic phase was dried over MgSO4 and the solvents were removed under reduced pressure. The crude product was purified by chromatography on silica gel eluting with a gradient of n-heptane/ethyl acetate. The fractions containing the product were combined and the solvent evaporated under reduced pressure. Yield: 3.3 g.

Workup

  1. additionwas added
  2. extractionextracted with DCM
  3. dry with materialThe organic phase was dried over MgSO4
  4. customthe solvents were removed under reduced pressure
  5. customThe crude product was purified by chromatography on silica gel eluting with a gradient of n-heptane/ethyl acetate
  6. additionThe fractions containing the product
  7. customthe solvent evaporated under reduced pressure

Sources & evidence

ORD record
ord-2b6f2a15ef2642cf8114976875df67f5
Source dataset
uspto-grants-2013_12
Patent number
US08598179B2

Reaction notes

Loading…