Methyl iodide → 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(3-methoxyphenyl)ethenyl)-7-methyl-, (E)-

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Reaction Conditions

Reaction Steps

Compound r (1.70 g, 5.0 mmol) obtained in Reference Example 17 was dissolved in 40 ml of dimethylformamide. To the solution were added 1.73 g (12.5 mmol) of potassium carbonate and subsequently 0.62 ml (10.0 mmol) of methyl iodide, and the resulting mixture was stirred at 50° C. for 30 minutes. After cooling, insoluble matters were filtered off, and 100 ml of water was added to the filtrate. The mixture was extracted three times with 50 ml of chloroform. The extract was washed twice with water and once with a saturated aqueous solution of sodium chloride, and dried over anhydrous sodium sulfate, followed by evaporation under reduced pressure. The obtained crude crystals were purified by silica gel column chromatography (eluent: 40% ethyl acetate/hexane), followed by recrystallization from cyclohexane/toluene to give 1.10 g (yield 62%) of Compound s as pale yellow needles.

Provenance & Evidence