[CH3:1][C:2]1[C:11]([N:12]=[S:13]=O)=[CH:10][CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].S(=NS(C)(=O)=O)=O.N1C=CC=CC=1.O>C1C=CC=CC=1>[N:12]1[S:13][CH:1]=[C:2]2[C:3]([C:4]([O:6][CH3:7])=[O:5])=[CH:8][CH:9]=[CH:10][C:11]=12To a solution of methyl 2-methyl-3-(sulfinylamino)benzoate (15.0 g, 71.0 mmol) in benzene (200 mL) was added a solution of N-sulfinylmethanesulfonamide (10.0 g, 71.0 mmol) and pyridine (9.19 mL, 114 mmol) in benzene (80 mL) at 0° C. The reaction mixture was heated under reflux for 18 hr, water was added, and the mixture was extracted with dichloromethane. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=20/80) to give the title compound (5.0 g, yield 36%).
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