Triethylamine → cyclopentanecarboxylic acid 7-[4-(4-benzo[b]thiophen-4-ylpiperazin-1-yl)butoxy]-2-oxo-3,4-dihydro-2H-quinolin-1-ylmethyl ester

Participants

Reaction Steps

To a solution (20 ml) of 7-[4-(4-benzo[b]thiophen-4-ylpiperazin-1-yl)butoxy]-1-hydroxymethyl-3,4-dihydro-1H-quinolin-2-one (962 mg, 2.066 mmol) synthesized in the same manner as in Example 1, cyclopentanecarboxylic acid (0.448 ml, 4.13 mmol), 2-chloro-1,3-dimethylimidazolium chloride (768 mg, 4.55 mmol) in methylene chloride was added triethylamine (1.267 ml, 9.09 mmol), and the mixture was stirred at room temperature for 1 hr. 2-Chloro-1,3-dimethylimidazolium chloride (768 mg, 4.55 mmol) was added, and the mixture was heated under reflux for 1 hr. After cooling to room temperature, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. This was purified by moderate-pressure basic silica gel column (hexane:ethyl acetate=1:3) and concentrated under reduced pressure to give the title compound (yield 261 mg, 22.49%) as a colorless oil.

Provenance & Evidence