Phosphorus oxychloride → HCID 57447453, 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]([Cl:22])=[N:20][CH:19]=[CH:18][N:17]=2)=[CH:4][CH:3]=1.P(Cl)(Cl)([Cl:25])=O>>[Cl:25][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]([Cl:22])=[N:20][CH:19]=[CH:18][N:17]=1Participants
Conditions
- Temperature
- 110 °C
Procedure
0.57 g of 5-(4-chlorophenyl)-4-(3-chloro-2-pyrazinyl)-6-methyl-2H-pyri dazin-3-one and 6 g of phosphorus oxychloride were mixed. The mixture was stirred for 2 hours on an oil bath of 110° C. The reaction mixture was allowed to cool to room temperature, then, concentrated under reduced pressure. To the resultant residue were added ethyl acetate and ice-cooled sodium bicarbonate water. The mixture was stirred for about 5 minutes at room temperature, then, liquid-separated. The organic layer was washed with brine, and dried over anhydrous magnesium sulfate, then, concentrated under reduced pressure. 0.60 g of the resultant residue was subjected to silica gel column chromatography, to obtain 0.49 g of 3-chloro-5-(4-chlorophenyl)-4-(3-chloro-2-pyrazinyl)-6-methy lpyridazine (hereinafter, described as compound (12) of the present invention.).
Workup
- temperatureto cool to room temperature
- concentrationconcentrated under reduced pressure
- additionTo the resultant residue were added ethyl acetate and ice-
- temperaturecooled sodium bicarbonate water
- stirringThe mixture was stirred for about 5 minutes at room temperature
- customliquid-separated
- washThe organic layer was washed with brine
- dry with materialdried over anhydrous magnesium sulfate
- concentrationconcentrated under reduced pressure
Sources & evidence
- ORD record
- ord-b4209c0b1f414cd6b2808e4ea6e1170b
- Source dataset
- uspto-grants-2012_09
- Patent number
- US08258136B2
Reaction notes
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