Toluene → 4-(4'-Chloro-4-methylbiphenyl-3-yl)-2,2,6,6-tetramethylpyran-3,5-dione

HRID 468216Notes

Reaction equation

HRID 468216 reaction equation
[CH3:1][C:2]1([CH3:12])[C:7](=[O:8])[CH2:6][C:5](=[O:9])[C:4]([CH3:11])([CH3:10])[O:3]1.C(Cl)(Cl)Cl.C1(C)C=CC=CC=1.C([O-])(=O)C.C([O-])(=O)C.C([O-])(=O)C.[Cl:36][C:37]1[CH:42]=[CH:41][C:40]([C:43]2[CH:48]=[CH:47][C:46]([CH3:49])=[C:45]([Pb+3])[CH:44]=2)=[CH:39][CH:38]=1>ClCCl.Cl>[Cl:36][C:37]1[CH:38]=[CH:39][C:40]([C:43]2[CH:48]=[CH:47][C:46]([CH3:49])=[C:45]([CH:6]3[C:7](=[O:8])[C:2]([CH3:12])([CH3:1])[O:3][C:4]([CH3:11])([CH3:10])[C:5]3=[O:9])[CH:44]=2)=[CH:41][CH:42]=1

Participants

7

Reactant 4

HCID 1140TolueneHCID 6212ChloroformHCID 199092752,2,6,6-Tetramethyloxane-3,5-dioneHCID 178476525HCID 178476525, compound

Product 1

HCID 670725154-(4'-Chloro-4-methylbiphenyl-3-yl)-2,2,6,6-tetramethylpyran-3,5-dione

Reagents, catalysts & solvents 2

HCID 313Hydrochloric AcidSolventHCID 6344DichloromethaneSolvent

Procedure

To a mixture of 2,2,6,6-tetramethylpyran-3,5-dione (described in U.S. Pat. No. 5,089,046A) (0.296 g, 1.74 mmol) and N,N-dimethylaminopyridine (1.06 g, 8.70 mmol) is added anhydrous chloroform (20 ml), followed by stirring at room temperature until dissolution. To this solution is added anhydrous toluene (5 ml), followed by 4′-chloro-4-methylbiphenyl-3-yllead triacetate (1.12 g, 1.91 mmol) in one portion and the reaction mixture heated at 80° C. for 1-2 hours. The mixture is allowed to cool to room temperature, then diluted with dichloromethane (150 ml) and dilute aqueous hydrochloric acid (30 ml), followed by stirring for 5 minutes and filtration through diatomaceous earth to remove inorganic residues (additional washing with solvents). All organic fractions are combined, dried over anhydrous magnesium sulfate and concentrated in vacuo. The crude product is purified by column chromatography (100% hexane to hexane/ethyl acetate 5:1 ratio) then triturated with hexanes to afford 4-(4′-chloro-4-methylbiphenyl-3-yl)-2,2,6,6-tetramethylpyran-3,5-dione (0.318 g) as a cream powder.

Workup

  1. temperaturethe reaction mixture heated at 80° C. for 1-2 hours
  2. temperatureto cool to room temperature
  3. stirringby stirring for 5 minutes
  4. filtrationfiltration through diatomaceous earth
  5. customto remove inorganic
  6. washresidues (additional washing with solvents)
  7. dry with materialdried over anhydrous magnesium sulfate
  8. concentrationconcentrated in vacuo
  9. customThe crude product is purified by column chromatography (100% hexane to hexane/ethyl acetate 5:1 ratio)
  10. customthen triturated with hexanes

Sources & evidence

ORD record
ord-dbb197ed3dac45f5a84568d6e39a964e
Source dataset
uspto-grants-2014_01
Patent number
US08623907B2

Reaction notes

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