[Br:1][C:2]1[CH:3]=[C:4]([SH:8])[CH:5]=[CH:6][CH:7]=1.C(=O)([O-])[O-].[K+].[K+].C([O:18][CH2:19][CH2:20][CH2:21]Cl)(=O)C>CN(C)C=O>[Br:1][C:2]1[CH:3]=[C:4]([S:8][CH2:21][CH2:20][CH2:19][OH:18])[CH:5]=[CH:6][CH:7]=13-Bromobenzenethiol (0.40 g) and potassium carbonate (0.44 g) were suspended in N,N-dimethylformamide (4.2 mL), 3-chloropropyl acetate (0.34 mL) was added, and the resulting mixture was stirred at 60° C. for 5 hours. The reaction mixture was partitioned between diethyl ether (40 mL) and water (10 mL). The organic layer was washed successively with water (10 mL×2) and brine (10 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was dissolved in methanol (8.5 mL), 28% sodium methoxide-methanol solution (0.08 mL) was added, and the resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was concentrated under reduced pressure and the residue obtained was purified by column chromatography on silica gel (eluent: hexane/ethyl acetate=3/1) to give the title compound (0.49 g).
Wird geladen…