Thionyl Chloride → (2E)-3-(2,4-difluorophenyl)prop-2-enoyl chloride

HRID 50885Notes

Reaction equation

HRID 50885 reaction equation
[F:1][C:2]1[CH:12]=[C:11]([F:13])[CH:10]=[CH:9][C:3]=1/[CH:4]=[CH:5]/[C:6](O)=[O:7].S(Cl)([Cl:16])=O>C1C=CC=CC=1>[F:1][C:2]1[CH:12]=[C:11]([F:13])[CH:10]=[CH:9][C:3]=1/[CH:4]=[CH:5]/[C:6]([Cl:16])=[O:7]

Participants

4

Reactant 2

HCID 24386Thionyl ChlorideHCID 53749452,4-Difluorocinnamic Acid

Product 1

HCID 11159992(2E)-3-(2,4-difluorophenyl)prop-2-enoyl chloride

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

To a solution of (E)-2,4-difluorocinnamic acid (331 mg, 1.8 mmol) in benzene (10 ml) was added thionyl chloride (0.5 ml) and the mixture was heated to reflux for 60 min. Volatiles were removed by evaporation to give crude (E)-2,4-difluorocinnamoyl chloride. Free base of the titled compound was prepared from N-(2-pyridyl)-o-phenylenediamine (250 mg, 1.4 mmol) and (E)-2,4-difluorocinnamoyl chloride obtained as above according to the preparation of (E)-1-(2-pyridyl)-2-styryl-1H-benzimidazole (Example 1, method A). The free base was dissolved with a 10% methanol solution of hydrogen chloride (5 ml). Concentration and recrystallization from ethyl acetate/ethanol yielded the titled compound. MW: 369.80; mp: 194.8-196.8° C.; 1H-NMR (DMSO) δ: 8.84-8.79 (1H, m), 8.30-8.08 (2H, m), 7.96-7.82 (3H, m), 7.78-7.69 (1H, m), 7.61-7.13 (6H, m).

Workup

  1. temperaturethe mixture was heated
  2. temperatureto reflux for 60 min
  3. customVolatiles were removed by evaporation

Sources & evidence

ORD record
ord-b77ca278a6e04776a9d569e4b5864af1
Source dataset
uspto-grants-2004_03
Patent number
US06713482B2

Reaction notes

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