[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][C:7]([NH2:10])=[CH:6][CH:5]=1.N1C=CC=CC=1.[CH3:18][S:19]([C:22]1[CH:27]=[CH:26][C:25]([S:28](Cl)(=[O:30])=[O:29])=[CH:24][CH:23]=1)(=[O:21])=[O:20]>ClCCl.C(OCC)(=O)C>[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][C:7]([NH:10][S:28]([C:25]2[CH:24]=[CH:23][C:22]([S:19]([CH3:18])(=[O:21])=[O:20])=[CH:27][CH:26]=2)(=[O:30])=[O:29])=[CH:6][CH:5]=1To a stirring solution of 4-amino-benzoic acid methyl ester (0.594 g, 3.93 mmol) in a mixture of dichloromethane (15 mL)/pyridine (15 mL) is added 4-methanesulfonyl benzenesulfonyl chloride (1.0 g, 3.93 mmol) and the mixture is allowed to react for 6 h at ambient temperature. The reaction is diluted with ethyl acetate and washed with 1N HCl. The organic layer is separated and dried over sodium sulfate, filtered, and concentrated to give 1.26 g (87%) of the title compound. MS (ES−) (m/e) 368.0 (M−1)−.
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