Triethylamine → 8-(5-Fluoro-2-methylphenoxymethyl)-7-(2-methoxy-4-methylsulfonyloxyphenyl)-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 (Reference Compound No. 14-1, 61.1 mg, 0.136 mmol) was dissolved in anhydrous dichloromethane (1 mL), and triethylamine (44 μL, 0.319 mmol) and methanesulfonyl chloride (13 μL, 0.168 mmol) were added thereto successively. The reaction mixture was stirred at room temperature for 3 hours and 15 minutes. The reaction mixture was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled compound (68.3 mg) as a colorless amorphous product. (Yield 98%)

Provenance & Evidence