3-Phenoxyphenol → 4-Hydroxy-2-oxo-7-phenoxy-2H-chromene-3-carboxylic acid ethyl ester

関与物質

反応条件

反応手順

A mixture of 3-phenoxy-phenol (1.068 g, 5.73 mmol), 2-ethoxycarbonyl-malonic acid diethyl ester (3.65 mL, 17.2 mmol), and tin tetrachloride (14 μL, 0.11 mmol) was heated in a 200° C.-oil bath for 5 min; then cooled, the reaction mixture was directly purified on silica gel column chromatography (eluent: ethyl acetate in dichloromethane: 10% to 80%) to give the desired title product (84 mg, 4.4%). ESI (m/z): 327 (M+H)+.

情報源と証拠