Chlorosulfonic acid → 3-(2-Chloroacetamido)-2,4-dimethylbenzene-1-sulfonyl chloride
Reaction equation
[Cl:1][S:2]([OH:5])(=O)=[O:3].[CH3:6][C:7]1[CH:12]=[CH:11][CH:10]=[C:9]([CH3:13])[C:8]=1[NH:14][C:15]([CH2:17][Cl:18])=[O:16]>>[Cl:18][CH2:17][C:15]([NH:14][C:8]1[C:7]([CH3:6])=[C:12]([S:2]([Cl:1])(=[O:5])=[O:3])[CH:11]=[CH:10][C:9]=1[CH3:13])=[O:16]Participants
3
Procedure
To chlorosulfonic acid (75 mL, 1.15 mol) was added with stirring solid 2-chloro-2',6'-acetoxylidide over a 30 minute period at 25°-30° C. and the reaction mixture was stirred at 60°-65° C. for 1.5 hours. The reaction was cooled, added to ice and extracted with ethyl acetate/methyl ethyl ketone. The combined extracts were washed with water and brine; dried, and the solvent was removed in vacuo; the residual product (61.4 g, 69%) was a white solid, m.p. 147.5°-149° C.
Workup
- temperatureThe reaction was cooled
- additionadded to ice
- extractionextracted with ethyl acetate/methyl ethyl ketone