[CH3:1][O:2][C:3](=[O:16])[CH:4]=[CH:5][C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([S:12](Cl)(=[O:14])=[O:13])[CH:7]=1.[NH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.N1C=CC=CC=1>ClCCl>[CH3:1][O:2][C:3](=[O:16])[CH:4]=[CH:5][C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([S:12](=[O:14])(=[O:13])[NH:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[CH:7]=1A solution of 3-(3-chlorosulfonylphenyl)acrylic acid methyl ester (3) (0.640 g, 2.45 mmol) in dichloromethane (2 ml) was added to a mixture of aniline (0.465 g, 4.99 mmol) and pyridine (1 ml), and the resultant solution was stirred at 50° C. for one hour. The reaction mixture was evaporated and the residue was partitioned between ethyl acetate and 10% HCl. The organic layer was washed successively with water, saturated NaCl, and dried (Na2SO4). The solvent was removed and the residue was chromatographed on silica gel with chloroform-ethyl acetate (7:1, v/v) as eluent. The obtained product was washed with diethyl ether to give the title compound (0.226 g, 29%). 1H NMR (CDCl3, HMDSO), δ: 3.72 (3H, s); 6.34 (1H, d, J=16.0 Hz); 6.68 (1H, br s); 6.92–7.89 (10H, m).
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