Thionyl Chloride → 6-Nitropyridine-3-carbonyl chloride
Reaction equation
[N+:1]([C:4]1[CH:12]=[CH:11][C:7]([C:8](O)=[O:9])=[CH:6][N:5]=1)([O-:3])=[O:2].S(Cl)([Cl:15])=O>>[N+:1]([C:4]1[CH:12]=[CH:11][C:7]([C:8]([Cl:15])=[O:9])=[CH:6][N:5]=1)([O-:3])=[O:2]Participants
Procedure
To 6-nitronicotinic acid (3.5 g) is added thionyl chloride (50 ml), and the mixture is refluxed for three hours, and evaporated to remove thionyl chloride to give 6-nitronicotinoyl chloride, which is added with stirring to a solution of 7-chloro-5-oxo-2,3,4,5-tetrahydro-1H-benzazepine (3.4 g) in pyridine (50 ml) under ice-cooling. The mixture is stirred at room temperature overnight. To the reaction mixture is added water, and the mixture is extracted with ethyl acetate. The extract is washed successively with 0.1N aqueous hydrochloric acid and water, and dried over magnesium sulfate. The resultant is evaporated under reduced pressure to remove the solvent, and the residue is purified by silica gel column chromatography to give 7-chloro-5-oxo-1-(6-nitronicotinoyl)-2,3,4,5-tetrahydro-1H-benzazepine (4.9 g) as colorless amorphous.
Workup
- temperaturethe mixture is refluxed for three hours
- customevaporated
- customto remove thionyl chloride
Sources & evidence
- ORD record
- ord-4a4c71a79da4400bb39308179a35ae18
- Source dataset
- uspto-grants-1997_10
- Patent number
- US05677299
Reaction notes
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