Ethanol → 3,7-Dihydro-6-methylthio-3-n-propyl-2H-purin-2-one

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Reaction Steps

Under an argon atmosphere, 9.77 g (244 mmol) of 60% sodium hydride was washed 3 times with n-hexane. The solvent was evaporated under reduced pressure to dry. To the residue was added 900 ml of dimethylformamide. Under ice cooling, 57.0 g (271 mmol) of 3-n-propyl-6-thioxanthine (Japanese Published Unexamined Patent Application No. 183287/86) was gently added to the mixture. 15 minutes after, 15.2 ml (244 mmol) of methyl iodide was dropwise added to the reaction solution. After stirring was continued for 30 minutes, 50 ml of ethanol was added and the mixture was concentrated under reduced pressure. After 400 ml of water was added to the residue, the precipitate was collected by filtration to afford 13.9 g (yield, 23%) of Compound b as a light yellow powder. The filtrate was extracted 5 times with 200 ml of chloroform. After washing with saturated sodium chloride aqueous solution, the filtrate was dried over anhydrous sodium sulfate and the solvent was evaporated under reduced pressure. The residue was isolated and purified by silica gel column chromatography (eluting solvent; 10% methanol/chloroform) to afford further 16.0 g (yield, 26%) of Compound b as a light yellow powder.

Provenance & Evidence