反应详情

To 4-acetylamino-3-methyl-benzofuran-2-carboxylic acid ethyl ester (300 mg, 1.15 mmol, 1 eq, prepared according to Example 48, Step 1) under nitrogen was added 5 mL of DMF, iodomethane (79 uL, 1.26 mmol, 1.1 eq), and sodium hydride (60%, 51 mg, 1.26 mmol, 1.1 eq). The reaction mixture was stirred at room temperature for 4 h. After work up and flash column chromatography (5-40% ethyl acetate/hexanes), 4-(acetyl-methyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester was obtained in 35% yield (112 mg). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.3 (t, J=7.2 Hz, 3 H) 1.7 (s, 3 H) 2.5 (s, 3 H) 3.2 (s, 3 H) 4.4 (m, 2 H) 7.3 (dd, J=7.6, 0.8 Hz, 1 H) 7.6 (dd, J=8.5, 7.7 Hz, 1 H) 7.8 (dd, J=8.5, 0.9 Hz, 1 H).