[C:1]([NH:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:12][C:13]3[C:21]([F:22])=[CH:20][C:19]([F:23])=[C:18]([NH2:24])[C:14]=3[C:15](=[O:17])[CH:16]=2)=[CH:7][C:6]=1[F:25])(=[O:3])[CH3:2].[CH3:26][S:27][CH2:28][CH2:29]Cl.CC(C)([O-])C.[K+].O>CN(C)C=O>[C:1]([N:4]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:12][C:13]3[C:21]([F:22])=[CH:20][C:19]([F:23])=[C:18]([NH2:24])[C:14]=3[C:15](=[O:17])[CH:16]=2)=[CH:7][C:6]=1[F:25])[CH2:29][CH2:28][S:27][CH3:26])(=[O:3])[CH3:2]1.00 g (2.87 mmol) of Compound 27 obtained in Example 27 was dissolved in 30 ml of dimethylformamide under argon atmosphere, 1.43 ml of chloroethyl methyl sulfide and 354 mg of potassium tert-butoxide were added under ice-cooling and the mixture was stirred at 50° to 60 ° C. for 1 hour. Additional 0.29 ml of chloroethyl methyl sulfide and 322 mg of potassium tert-butoxide were added and the mixture was stirred at the same temperature for 17 hours. The reaction solution was cooled on ice, water was added and the mixture was extracted with ethyl acetate. The organic layer was washed with an aqueous solution of sodium chloride and dried over anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=30:1) to give 380 mg (32%) of 2-[4-[N-acetyl-N-(2-methylthioethyl)amino]-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one.
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