Iodine → HCID 14281037, compound

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Reaction Steps

A solution of 5-[[5-[[[3-(1-methylethyl)-2-oxooxazolidin-5-yl]methyl]oxy]-2-nitrophenyl]methylene]-2,4-imidazolidinedione (8.80 g, 22 mmol) in dimethylformamide (150 mL) was hydrogenated at 60 p.s.i. over 10% palladium on charcoal (0.88 g) in a low pressure hydrogenation apparatus. After 21 hours, the mixture was filtered through kieselguhr and the solvent evaporated in vacuo at about 40° C. to leave a foamy solid. Methanol (180 mL) was added, the mixture heated to reflux and iodine (5.72 g 22 mmol) added portionwise over 15 minutes. After refluxing for a further 15 minutes, the mixture was concentrated to about 50 mL and diluted with 10% sodium sulfate solution and 10% sodium carbonate solution. A grey solid was filtered off, washed with water and air dried to give (4.18 g, 54%) of product. Three further crops amounting to (3.41 g, 46%) were subsequently collected. An analytical sample was purified by dissolving 2 g in 10% hydrochloric acid in methanol. Addition of diethyl ether afforded 1,3-dihydro-7-[[3-(1-methylethyl)-2-oxo-5-oxazolidinyl]methoxy]-2H-imidazo[4,5-b]quinolin-2-one hydrochloride (1.1 g, 50%) m.p. 264°-266° C.

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