CO.[NH2-].[Na+].[Cl:5][C:6]1[CH:7]=[C:8]([CH:13]([S:18][CH2:19][CH2:20][C:21](=[O:23])[CH3:22])[C:14]([O:16]C)=O)[CH:9]=[CH:10][C:11]=1[Cl:12].[Cl-].[NH4+]>O>[Cl:5][C:6]1[CH:7]=[C:8]([CH:13]2[C:14]([OH:16])=[C:20]([C:21]([CH3:22])=[O:23])[CH2:19][S:18]2)[CH:9]=[CH:10][C:11]=1[Cl:12]A methanol (500 mL) solution of sodium amide (19.2 g, purity: 90%, 1.5 equivalent amounts based on the starting material) was heated to 40° C., and to this solution, a methanol (200 mL) solution of methyl 2-(3,4-dichlorophenyl)-2-(3-oxobutylthio)acetate (100 g, purity: 95%, 296 mmol) was dropwise added over a period of 12 minutes, followed by stirring at 40° C. for 1 hour. The reaction solution was cooled to 5° C., water (300 mL) was dropwise added over a period of 10 minutes, and then the solvent was distilled off. To the obtained crude product, chloroform and a saturated ammonium chloride aqueous solution were added, followed by liquid separation, and the organic layer was washed with a saturated salt solution and dried over anhydrous magnesium sulfate. The drying agent was removed by filtration, and the solvent was distilled off to give the desired product as an oil (59.3 g, yield: 65%).
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