18-Crown-6 → HCID 54041294, compound

Participants

Reaction Steps

0.82 g (0.00731 mole) of potassium tert-butoxide was added to a solution of 1.39 g (0.00567 mole) of 5-[3-(4-fluorophenyl)propionyl]-2,3-dimethylpyrrole and 0.19 g (0.00074 mole) of 18-crown-6 in 40 ml of tetrahydrofuran and the resulting mixture was stirred at room temperature for 20 minutes. 1.80 g (0.0115 mole) of 1-bromo-2-butene (a mixture of cis and trans isomers) were added to the mixture and stirred at room temperature for 4 hours. After completion of the reaction, the reaction mixture was poured into ice-water and the aqueous mixture was extracted twice with 80 ml each of ethyl acetate. The extract was wahed with a saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by column chromatography through silica gel using a 1:10 mixture of ethyl acetate and hexane as an eluent to give 0.90 g of the title compound (cis/trans=22/78) as a pale yellow oil.

Provenance & Evidence