Quinoline → HCID 178516363, compound

Participants

Reaction Steps

A suspension of 50 g. of 4-hydroxy-6,7-methylenedioxyquinoline-3-carboxylic acid in 500 ml. of freshly distilled quinoline was heated at 200° until the evolution of gas ceased. The reaction mixture was cooled to room temperature, diluted with an equal amount of ether and kept cool overnight. The precipitated brown solid (51.4 g., m.p. 254°-267°) was collected by filtration and dissolved in refluxing ethanol. The insoluble material was removed and the ethanol solution was reduced to one-third of its volume. The solution was diluted with an equal amount of ether. On cooling, 31.1 g. of 6,7-methylenedioxy-4-quinolinol separated, m.p. 280°-282°. Recrystallization (2x) from hot water yielded analytically pure 6,7-methylenedioxy-4-quinolinol as a pale yellow solid, m.p. 288°-289°.

Provenance & Evidence