Triethylamine → 7-[4-(3-Chlorophenylaminocarbonyloxy)-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, 20.3 mg, 0.0451 mmol) was dissolved in anhydrous dichloromethane (0.5 mL), then triethylamine (13.6 μL, 0.0977 mmol) and 3-chlorophenyl isocyanate (6 μL, 0.05 mmol) were added to the mixture successively. After the reaction mixture was stirred for 1 hour at room temperature, the mixture was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled compound (22.4 mg) as a colorless solid. (Yield 82%)

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