Triethylamine → 7-(4-Butyryloxy-2-methoxyphenyl)-8-(5-fluoro-2-methylphenoxymethyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

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Reaction Steps

8-(5-Fluoro-2-methylphenoxymethyl)-7-(4-hydroxy-2-methoxyphenyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Compound No. 11, 25 mg, 0.055 mmol) was dissolved in tetrahydrofuran (1 mL), and triethylamine (20 μL, 0.14 mmol) and butyryl chloride (7.6 μL, 0.073 mmol) were added successively. After the reaction mixture was stirred at room temperature for 1 hour, the mixture was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled compound (27 mg) as a colorless amorphous product. (Yield 92%)

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