Methane, dichloromethoxy- → 8-Methoxy-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde

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Reaction Steps

8-Methoxy-3,4-dihydro-1H-quinolin-2-one (5 g) was dissolved in dichloromethane (100 ml), and dichloromethyl methyl ether (6.4 ml) was added at room temperature, followed by cooling in an ice water bath. Titanium tetrachloride (85 ml) was added dropwise at a temperature not higher than 10° C., and the resulting mixture was stirred at room temperature overnight. The reaction mixture was poured into ice water, and the aqueous layer was subjected to extraction with dichloromethane. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. Diethyl ether was added to the residue and the produced solid was collected by filtration and dried to thereby obtain 5.2 g (yield: 90%) of 8-methoxy-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde.

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