[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([CH:9]=[CH:10][C:11]2[O:15][N:14]=[C:13]([CH2:16][CH2:17][CH3:18])[N:12]=2)=[CH:5][C:4]=1[NH2:19].N1C=CC=CC=1.[CH3:26][S:27](Cl)(=[O:29])=[O:28]>ClCCl>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([CH:9]=[CH:10][C:11]2[O:15][N:14]=[C:13]([CH2:16][CH2:17][CH3:18])[N:12]=2)=[CH:5][C:4]=1[NH:19][S:27]([CH3:26])(=[O:29])=[O:28]2-Methoxy-5-[2-(3-propyl-[1,2,4]oxadiazol-5-yl)-vinyl]-phenylamine (compound of Example 8; 0.08 g, 3.08 mmol) was dissolved in dichloromethane (10 mL) followed by addition of pyridine (0.047 mL, 0.60 mmol) and methanesulfonyl chloride (0.034 mL, 0.45 mmol) at room temperature. After stirring for 8 h, dichloromethane was evaporated and the reaction mixture was cooled to room temperature. The crude residue obtained was purified by column chromatography (silica gel, petroleum ether) to afford the title compound.
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