[Cl:1][C:2]1[C:3]2[CH:10]=[CH:9][CH:8]=[C:7]([CH2:11][NH:12][CH3:13])[C:4]=2[S:5][CH:6]=1.[Cl:14][CH:15]=[CH:16][CH2:17]Cl.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>CS(C)=O>[Cl:1][C:2]1[C:3]2[CH:10]=[CH:9][CH:8]=[C:7]([CH2:11][N:12]([CH2:17]/[CH:16]=[CH:15]/[Cl:14])[CH3:13])[C:4]=2[S:5][CH:6]=1
To a solution of 0.22 g (1.0 mmol) of 3-chloro-N-methylbenzo[b]thiophene-7-methanamine in 3 ml of dimethyl sulfoxide were added 0.12 ml. (1.2 mmol) of 1,3-dichloropropene (E/Z=9/1) and 0.21 g (1.5 mmol) of ground potassium carbonate. The mixture was stirred for 17 hours at 50° C., and poured into 50 ml of ethyl acetate. The organic layer was washed with 25 ml x 2 of water and 10 ml of saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was subjected to silica gel chromatography (n-heptane→n-heptane/ethyl acetate=9/1). The desired fractions were put together and concentrated under reduced pressure to obtain 0.21 g (yield: 73%) of the above identified compound as an oil.
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