反应详情

Magnesium sulfate anhydrous (9.62 g, 80 mmol) was suspended at room temperature in dichloromethane (50 mL) and 96% sulfuric acid (1.1 mL, 20 mmol) was added, the mixture was vigorously stirred for 15 min and then 4-hydroxy-3-nitrobenzoic acid (3.7 g, 20.22 mmol) and tert-butanol (9.6 mL, 100 mmol) were added. Stirring was continued for 48 hours. A saturated sodium hydrogen carbonate solution (150 mL) was slowly added and the mixture was diluted with dichloromethane (150 mL). The organic layer was separated and dried (Na2SO4), evaporated to afford tert-butyl 4-hydroxy-3-nitrobenzoate as a yellow solid (4.43 g, 90%).

1. stirringStirring
2. waitwas continued for 48 hours
3. customThe organic layer was separated
4. dry with materialdried (Na2SO4)
5. customevaporated