CS(O[CH2:6][CH2:7][O:8][CH2:9][CH2:10][C:11]1[CH:19]=[CH:18][C:14]2[S:15][CH:16]=[CH:17][C:13]=2[CH:12]=1)(=O)=O.[CH2:20]([NH2:23])[C:21]#[CH:22].C(=O)([O-])[O-].[K+].[K+].O>CN(C)C=O.C(OCC)(=O)C>[S:15]1[CH:16]=[CH:17][C:13]2[CH:12]=[C:11]([CH2:10][CH2:9][O:8][CH2:7][CH2:6][NH:23][CH2:20][C:21]#[CH:22])[CH:19]=[CH:18][C:14]1=2In 15 mL of N,N-dimethylformamide is dissolved 3.00 g of 2-(2-benzo[b]thiophen-5-ylethoxy)-ethyl methanesulfonate, to which are added 1.40 mL of propargylamine and 2.76 g of potassium carbonate. The mixture is heated at 80° C. for 3 hours. The reaction mixture is introduced into a mixture of water and ethyl acetate, and the organic layer is separated. The organic layer is washed with water and saturated aqueous solution of sodium chloride successively and dried over anhydrous magnesium sulfate, the solvent is distilled off under reduced pressure, and the residue is purified by column chromatography (eluent: chloroform:methanol=30:1 to 20:1) to obtain 1.63 g of N-[2-(2-benzo[b]thiophen-5-ylethoxy)ethyl]-N-(2-propynyl)amine as an oily product.
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