Trifluoroacetic anhydride → 1-(4-Bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-but-2-en-1-one

HRID 68566

Reaction equation

HRID 68566 reaction equation
FC(F)(F)C(OC(=O)C(F)(F)F)=O.[Br:14][C:15]1[CH:16]=[C:17]([C:21](=[O:37])[CH2:22][C:23]([C:29]2[CH:34]=[C:33]([Cl:35])[CH:32]=[C:31]([Cl:36])[CH:30]=2)(O)[C:24]([F:27])([F:26])[F:25])[S:18][C:19]=1[CH3:20]>C(N(CC)CC)C>[Br:14][C:15]1[CH:16]=[C:17]([C:21](=[O:37])[CH:22]=[C:23]([C:29]2[CH:34]=[C:33]([Cl:35])[CH:32]=[C:31]([Cl:36])[CH:30]=2)[C:24]([F:27])([F:25])[F:26])[S:18][C:19]=1[CH3:20]

Participants

4

Reactant 2

HCID 9845Trifluoroacetic anhydrideHCID 86706646(4-Bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-hydroxy-butan-1-one

Product 1

HCID 867066471-(4-Bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-but-2-en-1-oneYield 89.9%

Reagents, catalysts & solvents 1

HCID 8471TriethylamineSolvent

Procedure

Triethylamine (53 ml) and trifluoracetic anhydride (38 ml) are added to a solution of -(4-bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-3-hydroxy-butan-1-one (110 g, 77% purity) at 0° C. After 12 hours at room temperature, the reaction is quenched with water (200 ml) and a saturated aqueous solution of NaHCO3. The aqueous phase is separated and further extracted with two times dichloromethane. The organic phases are combined, washed with water, dried over MgSO4 and concentrated in vacuo to yield 1-(4-bromo-5-methyl-thiophen-2-yl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-but-2-en-1-one (95 g, 71% purity) as a brown oil. The crude product is used without further purification.

Workup

  1. customthe reaction is quenched with water (200 ml)
  2. customThe aqueous phase is separated
  3. extractionfurther extracted with two times dichloromethane
  4. washwashed with water
  5. dry with materialdried over MgSO4
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-0caca6190e26406abd559db9e2830918
Source dataset
uspto-grants-2014_09
Patent number
US08822466B2

Linked notes

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