Chlorosulfonic acid → 1187082-98-9

HRID 1725686Notes

Reaction equation

HRID 1725686 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][C:3]=1[CH3:11].[Cl:12][S:13](O)(=[O:15])=[O:14]>>[Cl:12][S:13]([C:7]1[CH:6]=[C:5]([N+:8]([O-:10])=[O:9])[CH:4]=[C:3]([CH3:11])[C:2]=1[F:1])(=[O:15])=[O:14]

Participants

3

Reactant 2

HCID 24638Chlorosulfonic acidHCID 68001Benzene, 1-fluoro-2-methyl-4-nitro-

Product 1

HCID 575628801187082-98-9

Conditions

Temperature
100 °C

Procedure

A dry reaction flask equipped with a magnetic stirring bar, nitrogen inlet and reflux condenser was charged with 2-fluoro-5-nitrotoluene (6.20 g, 40 mmol) followed by chlorosulfonic acid (10.60 mL, 160 mmol) at 0° C., and then the reaction was stirred at 100° C. for 24 hours. After cooling it to the room temperature, the reaction was poured over ice-water (Caution!) and extracted with ethyl acetate (3×200 mL). Removal solvent under a reduced pressure afforded 3-chlorosulfonyl-4-fluoro-5-methylnitrobenzene intermediate, which was stirred in EtOAc (50 mL) and NH4OH (30%, 50 mL) for 2-3 hours. The separated organic phase was then evaporated to afford a crude material, which was purified by column chromatography (silica gel, hexanes then 10-20% EtOAc in hexanes) to afford 3-aminosulfonyl-4-fluoro-5-methylnitrobenzene. LCMS: purity: 96%; MS (m/e): 235 (MH+).

Workup

  1. customA dry reaction flask
  2. customequipped with a magnetic stirring bar, nitrogen inlet
  3. temperaturereflux condenser
  4. temperatureAfter cooling it to the room temperature
  5. extractionextracted with ethyl acetate (3×200 mL)
  6. customRemoval solvent under a reduced pressure

Sources & evidence

ORD record
ord-a8b857bb8fe748359b10d05339da5bb4
Source dataset
uspto-grants-2009_02
Patent number
US07491732B2

Reaction notes

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