Phosphorus oxychloride → HCID 57793923, compound
Reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:13]([CH3:14])=[N:12][NH:11][C:10](=O)[C:9]=2[C:16]2[C:21]([F:22])=[CH:20][C:19]([O:23][CH3:24])=[CH:18][C:17]=2[F:25])=[CH:4][CH:3]=1.P(Cl)(Cl)([Cl:28])=O>>[Cl:28][C:10]1[N:11]=[N:12][C:13]([CH3:14])=[C:8]([C:5]2[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=2)[C:9]=1[C:16]1[C:21]([F:22])=[CH:20][C:19]([O:23][CH3:24])=[CH:18][C:17]=1[F:25]Participants
Conditions
- Temperature
- 110 °C
Procedure
185 mg of 5-(4-chlorophenyl)-4-(2,6-difluoro-4-methoxyphenyl)-6-methyl-2H-pyridazin-3-one and 5 g of phosphorus oxychloride were mixed and stirred at 110° C. for 1 hour. The reaction mixture was allowed to cool down to room temperature and concentrated under reduced pressure. To the residue was added ethyl acetate and ice water, and separated to two layer. The organic layer was washed sequentially with water and saturated brine, and dried over anhydrous sodium sulfate, then, concentrated under reduced pressure. The residue was subjected to preparative thin layer chromatography (stationary phase: silica gel, developing solvent: hexane/ethyl acetate=3/1), to obtain 161 mg of 3-chloro-5-(4-chlorophenyl)-4-(2,6-difluoro-4-methoxyphenyl)-6-methylpyridazine (hereinafter, referred to as compound (v) of the present invention).
Workup
- temperatureto cool down to room temperature
- concentrationconcentrated under reduced pressure
- additionTo the residue was added ethyl acetate and ice water
- customseparated to two layer
- washThe organic layer was washed sequentially with water and saturated brine
- dry with materialdried over anhydrous sodium sulfate
- concentrationconcentrated under reduced pressure
Sources & evidence
- ORD record
- ord-4835e62ad7e8451fa60c3afdd35ae3e3
- Source dataset
- uspto-grants-2011_08
- Patent number
- US08008512B2
Reaction notes
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