[OH:1][N:2]=[C:3]1[CH:7]=[CH:6][S:5][C:4]1=[C:8]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[CH3:17])[C:9]#[N:10].[CH2:18]([S:21](Cl)(=[O:23])=[O:22])[CH2:19][CH3:20].C(N(CC)CC)C.O>O1CCCC1.ClCCl>[CH2:18]([S:21]([O:1][N:2]=[C:3]1[CH:7]=[CH:6][S:5][C:4]1=[C:8]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[CH3:17])[C:9]#[N:10])(=[O:23])=[O:22])[CH2:19][CH3:20]In 490 g of tetrahydrofuran were dissolved 45 g (0.19 mol) of (3-(hydroxy)imino-3H-thiophen-2-ylidene)-(2-methylphenyl)-acetonitrile in Synthesis Example 1 and 27.0 g (0.19 mol) of commercially available propanesulfonyl chloride. To the solution cooled, 20.6 g (0.20 mol) of triethylamine was added dropwise such that the temperature might not exceed 10° C. The solution was allowed to ripen for 1 hour at room temperature, after which 150 g of water and 500 g of dichloromethane were added. The organic layer was separated, and washed with 150 g of water three times. The organic layer was concentrated in vacuum. Methanol was added to the concentrate for recrystallization, followed by filtration and drying. There were obtained crude yellow crystals. The crude yellow crystals were purified by silica gel column chromatography (eluent, dichloromethane). The elute was concentrated, followed by recrystallization from methanol, filtration and drying. There was obtained 77 g of yellow crystals (yield 70%).
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