反应详情

温度

75 °C

Into a 250-mL 3-necked round-bottom flask, was placed methyl 2-(3,4,5-trimethoxyphenyl)quinazoline-4-carboxylate (1.7 g, 4.80 mmol, 1.00 equiv), methanol (10 mL) and sodium hydroxide (20%, 10 mL). The resulting solution was stirred for 30 min at 75° C. The pH value of the solution was adjusted to 2 with hydrogen chloride (1 mol/L). The resulting solution was extracted with 2×50 mL of dichloromethane and the organic layers combined. The mixture was dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 0.8 g (49%) of 2-(3,4,5-trimethoxyphenyl)quinazoline-4-carboxylic acid as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 3.99 (s, 3H), 4.06 (s, 6H), 7.77-7.81 (m, 1H), 7.84 (s, 2H), 8.03-8.07 (m, 1H), 8.22 (d, 1H), 9.41 (d, 1H); MS (ESI) m/z 341 ([M+H]+).

1. customInto a 250-mL 3-necked round-bottom flask, was placed
2. extractionThe resulting solution was extracted with 2×50 mL of dichloromethane
3. dry with materialThe mixture was dried over anhydrous sodium sulfate
4. concentrationconcentrated under vacuum
5. customThis resulted in 0.8 g (49%) of 2-(3,4,5-trimethoxyphenyl)quinazoline-4-carboxylic acid as a yellow solid