Triethylamine → 2,2-Dimethyl-propionic acid 4-(4-fluoro-benzyl)-3-oxo-2-(2,4,6-trimethyl-phenyl)-cyclopent-1-enyl ester

HRID 1631886Notes

Reaction equation

HRID 1631886 reaction equation
[F:1][C:2]1[CH:24]=[CH:23][C:5]([CH2:6][CH:7]2[CH2:11][C:10](=[O:12])[CH:9]([C:13]3[C:18]([CH3:19])=[CH:17][C:16]([CH3:20])=[CH:15][C:14]=3[CH3:21])[C:8]2=[O:22])=[CH:4][CH:3]=1.C(N(CC)CC)C.[C:32](Cl)(=[O:37])[C:33]([CH3:36])([CH3:35])[CH3:34]>ClCCl>[F:1][C:2]1[CH:24]=[CH:23][C:5]([CH2:6][CH:7]2[CH2:11][C:10]([O:12][C:32](=[O:37])[C:33]([CH3:36])([CH3:35])[CH3:34])=[C:9]([C:13]3[C:18]([CH3:19])=[CH:17][C:16]([CH3:20])=[CH:15][C:14]=3[CH3:21])[C:8]2=[O:22])=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 62493Pivaloyl chlorideHCID 668680864-(4-Fluoro-benzyl)-2-(2,4,6-trimethyl-phenyl)-cyclopentane-1,3-dione

Product 1

HCID 668682352,2-Dimethyl-propionic acid 4-(4-fluoro-benzyl)-3-oxo-2-(2,4,6-trimethyl-phenyl)-cyclopent-1-enyl esterYield 84.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-(4-fluoro-benzyl)-2-(2,4,6-trimethyl-phenyl)-cyclopentane-1,3-dione (30 mg, 0.09 mmol) in dichloromethane (1 ml) and triethylamine (52 μl, 0.37 mmol) is added the pivaloyl chloride (34 μl, 0.37 mmol) at room temperature. The reaction mixture is stirred overnight at room temperature. Silica gel is added to the crude reaction mixture, the solvent is evaporated under reduced pressure and the residue is purified by flash chromatography on silica gel to give 2,2-dimethyl-propionic acid 4-(4-fluoro-benzyl)-3-oxo-2-(2,4,6-trimethyl-phenyl)-cyclopent-1-enyl ester (31 mg).

Workup

  1. additionSilica gel is added to the crude
  2. customreaction mixture
  3. customthe solvent is evaporated under reduced pressure
  4. customthe residue is purified by flash chromatography on silica gel

Sources & evidence

ORD record
ord-ed585fa866e641b890212f364d8311ea
Source dataset
uspto-grants-2014_07
Patent number
US08791303B2

Reaction notes

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