[Cl:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([NH2:8])=[O:7])=[C:4]([O:11][CH3:12])[CH:3]=1.Cl[C:14]([S:16]Cl)=[O:15].O>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]2[O:7][C:14](=[O:15])[S:16][N:8]=2)=[C:4]([O:11][CH3:12])[CH:3]=1To a solution of 4-chloro-2-methoxybenzamide (0.82 g, 4.42 mmol) in toluene (20 ml) was added chlorocarbonylsulfenyl chloride (0.73 ml, 8.84 mmol) under nitrogen atmosphere and the resulting reaction mixture was refluxed at 90° C. for 2 h. After the completion of the reaction (TLC monitoring) water was added followed by extraction with ether (3×50 ml). The combined organics was then sequentially washed with water, 10% NaHCO3 (aqueous solution) and finally again with water. The organic layer was then dried over anhydrous Na2SO4, filtered and concentrated to get desired product (1.03 g, 96% crude yield) that was carried forward as such without further purification. MS: 244.16 (M+H)+.
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