Piperidine → HCID 70213354, compound

Participants

Reaction Steps

A solution of 8-hydroxyquinoline-5-carbaldehyde (346 mg, 2 mmol), 2-oxindole (266 mg, 2 mmol) and piperidine (43 mg, 0.5 mmol) in absolute ethanol (10 ml) was heated for 3 h at 60-70° C. under nitrogen. Then the reaction mixture was chilled and evaporated under vacuum to dryness. The residue was submitted to column chromatography over silica gel using dichloromethane/ethanol 4% as eluant to give pure 3-(8-hydroxy-5-quinolylmethylen)-2-oxindole in 60% yield (365 mg). To a solution of 3-(8-hydroxy-5-quinolylmethylen)-2-oxindole (300 mg, 0.99 mmol) in THF (5 ml) was added at room temperature a solution of 1M tetrabutylammonium fluoride (5 ml) and 2-bromopropionic acid ethylester (0.9 ml, 6.9 mmol). The reaction mixture was stirred at room temperature for another 1 h and then diluted with dichloromethane. The organic layer was washed with 5% NaHCO3 solution and water, dried over sodium sulfate and then evaporated under vacuum. The oily residue was chromatographed on silica gel using ethyl acetate as eluant to give pure title compound in 86% yield (330 mg).

Provenance & Evidence