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

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Reaction Steps

To a solution (10 ml) of cyclopentanecarboxylic acid 7-[4-(4-benzo[b]thiophen-4-ylpiperazin-1-yl)butoxy]-2-oxo-3,4-dihydro-2H-quinolin-1-ylmethyl ester (252 mg) synthesized in the same manner as in Example 13 in THF was added 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) (509 mg), and the mixture was stirred at room temperature stirred for 2 days. To the reaction mixture were added water and sodium carbonate, and the mixture was extracted with dichloromethane, dried over sodium sulfate, and concentrated under reduced pressure. The residue was purified by moderate-pressure silica gel column chromatography (hexane:ethyl acetate=1:0 to 0:1) and further by NH silica gel column chromatography (hexane:ethyl acetate=1:0 to 0:1) to give the title compound (yield 38 mg, 15%) as a colorless amorphous solid.

Provenance & Evidence