Chlorosulfonic acid → 4-(2-Oxoimidazolidin-1-yl)benzenesulfonyl chloride
Reaction equation
[Cl:1][S:2]([OH:5])(=O)=[O:3].C([N:13]1[CH2:17][CH2:16][N:15]([C:18]2[CH:23]=[CH:22][C:21](S(NC3C=CC=CC=3C(C3C=CC(F)=CN=3)=O)(=O)=O)=[CH:20][CH:19]=2)[C:14]1=[O:43])C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl>[O:43]=[C:14]1[NH:13][CH2:17][CH2:16][N:15]1[C:18]1[CH:23]=[CH:22][C:21]([S:2]([Cl:1])(=[O:5])=[O:3])=[CH:20][CH:19]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To 1.5 mL (23.1 mmol) of chlorosulfonic acid in 3 mL of carbon tetrachloride at 0° C. was added slowly 500 mg (3.1 mmol) of the compound of Step 1. The reaction was almost completed after 2 h at 0° C. The reaction mixture was poured into ice water slowly, then filtered to collect the solids formed. The aqueous layer was extracted with chloroform (3×100 ml), and the combined organic layers were dried over sodium sulfate, filtered, concentrated in vacuo. The filtered solid and the crude material from the extraction were combined to provide the title compound (LC/MS found: 261.1)