Sulfuric Acid → 2,6-Dichloro-5-fluoronicotinamide
Reaction equation
[Cl:1][C:2]1[C:7]([C:8]#[N:9])=[CH:6][C:5]([F:10])=[C:4]([Cl:11])[N:3]=1.S(=O)(=O)(O)[OH:13]>>[Cl:1][C:2]1[N:3]=[C:4]([Cl:11])[C:5]([F:10])=[CH:6][C:7]=1[C:8]([NH2:9])=[O:13]Participants
3
Conditions
- Temperature
- 62.5 °C
Procedure
A suspension of 25 g (130.90 mmol) of 2,6-dichloro-5-fluoro-3-cyanopyridine in conc. sulphuric acid (125 ml) was stirred for 1 h at 60-65° C. After cooling to RT, the flask contents were poured into ice water and extracted with ethyl acetate three times (100 ml each time). The combined organic phases were washed with water (100 ml) and then with saturated aqueous sodium hydrogen carbonate solution (100 ml), dried and concentrated in a rotary evaporator. The material obtained was dried under high vacuum.
Workup
- temperatureAfter cooling to RT
- extractionextracted with ethyl acetate three times (100 ml each time)
- washThe combined organic phases were washed with water (100 ml)
- dry with materialwith saturated aqueous sodium hydrogen carbonate solution (100 ml), dried
- concentrationconcentrated in a rotary evaporator
- customThe material obtained
- customwas dried under high vacuum
Sources & evidence
- ORD record
- ord-914d2942cc9140c680e4644cf1d1adbe
- Source dataset
- uspto-grants-2014_10
- Patent number
- US08859569B2
Reaction notes
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