Hydrochloric Acid → Acetic acid, (4-(2-(1,3-diethyl-2,3,6,7-tetrahydro-7-methyl-2,6-dioxo-1H-purin-8-yl)ethenyl)phenoxy)-, (E)-

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Reaction Steps

Compound 180 (200 mg, 0.47 mmol) obtained in Reference Example 119 was dissolved in a mixed solvent of 4 ml of tetrahydrofuran, 4 ml of ethanol, and 2 ml of water. To the solution was added 98 mg (2.34 mmol) of lithium hydroxide monohydrate, and the mixture was stirred at room temperature for one hour. To the reaction solution was added 2N hydrochloric acid, and the mixture was extracted with chloroform and dried over anhydrous sodium sulfate, followed by evaporation under reduced pressure. The residue was purified by silica gel column chromatography (eluent:chloroform/methanol/acetic acid) to give 40 mg (yield 21%) of Compound 181 as a pale yellow solid.

Provenance & Evidence