[CH3:1][S:2](Cl)(=[O:4])=[O:3].Cl.[NH2:7][C:8]1[CH:13]=[CH:12][C:11]([CH2:14][S:15]([O:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)(=[O:17])=[O:16])=[CH:10][CH:9]=1>N1C=CC=CC=1.CC(=O)OCC>[CH3:1][S:2]([NH:7][C:8]1[CH:13]=[CH:12][C:11]([CH2:14][S:15]([O:18][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)(=[O:17])=[O:16])=[CH:10][CH:9]=1)(=[O:4])=[O:3]Methanesulphonyl chloride (1.12 ml) was added to a cooled stirred solution of phenyl 4-aminobenzenemethanesulphonate, hydrochloride (3.0 g) in pyridine (9 ml). The resulting mixture was allowed to warm up to 20° and then stirred for 20 h. The reaction mixture was diluted with EA (150 ml) and washed with 8% NaHCO3 (400 ml), H2O (250 ml) and brine (250 ml). The organic extract was dried (MgSO4) and evaporated to leave a brown gum which was crystallised from toluene (100 ml) to give the crude title compound (as an off-white solid which was recrystallised from toluene (100 ml) to give the title compound (1.25 g) as a white solid m.p. 128°-129°.
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