Chloromethyl Methyl Ether → 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3,4-bis(methoxymethoxy)phenyl)ethenyl)-1,3-dipropyl-7-methyl-, (E)-

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Reaction Steps

Compound 54 (300 mg, 0.78 mmol) obtained in Reference Example 51 was dissolved in 6 ml of tetrahydrofuran. To the solution were added 1.64 ml (9.41 mmol) of diisopropylethylamine and 1.64 ml (7.12 mmol) of chloromethylmethyl ether under ice-cooling in a stream of argon, and the mixture was heated under reflux for 3 hours. Ice was added to the reaction solution and the mixture was separated with chloroform-a saturated aqueous saline solution. The organic layer was dried over anhydrous sodium sulfate, followed by evaporation under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate) and recrystallized from hexane/ethyl acetate to give 211 mg (yield 57%) of Compound 68 as white needles.

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