Ethyl Acetate → 8-methoxy-1-[6-(N-methyl-N-phenylamino)pyridin-3-ylmethyl]-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde

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Reaction Steps

Pyridinium p-toluene sulfonate (PPTS) (0.54 g) was added to a mixed solution of 5-(1,3-dioxolan-2-yl)-8-methoxy-1-[6-(N-methyl-N-phenylamino)pyridin-3-ylmethyl]-3,4-dihydro-1H-quinolin-2-one (0.95 g) in acetone (19 ml) and water (9.5 ml), followed by heating under reflux for 2 hours. An aqueous sodium hydrogencarbonate solution was added to the reaction mixture, and extraction with ethyl acetate was performed. The extract was washed twice with water, washed with a saturated sodium chloride solution, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:n-hexane=1:1). The purified product was concentrated under reduced pressure to thereby obtain 0.69 g (yield: 81%) of 8-methoxy-1-[6-(N-methyl-N-phenylamino)pyridin-3-ylmethyl]-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde as a light yellow amorphous solid.

Provenance & Evidence