反应详情

To a solution of 3-Methoxy-2-methyl-6-nitro-benzoic acid in 45 mL of methanol, Cs2CO3 (7.8 g, 24 mmol) is added and stirred at the room temperature for 1 hour. The solution is concentrated under reduced pressure then the resulting yellow solid is suspended in 45 ml of DMF. Iodomethane (1.5 ml 24 mol) is added at 0° C. and stirred at the room temperature for 21 hours. Water is added to the solution and the precipitates are collected and washed by water to give 3-Methoxy-2-methyl-6-nitro-benzoic acid methyl ester (4.0 g) as orange solid in 81% yields. 1H-NMR (400 MHz, δ, ppm) CDCl3: 2.2 (s, 3H), 3.93 (s, 3H), 3.98 (s, 3H), 6.91 (d, 1H), 8.11 (d, 1H).

1. concentrationThe solution is concentrated under reduced pressure
2. stirringstirred at the room temperature for 21 hours
3. customthe precipitates are collected
4. washwashed by water