反应详情

For example, a mixture of a compound of formula 40 wherein R3 and R4 are hydrogen and R5 is chloro, i.e., 5-chloro-2-hydroxy benzoic acid, (5.0 g, 29 mmol) and N-iodosuccinimide (7.17 g, 32 mmol) in acetic acid (30 mL) was heated to 95° C. for 2 h. Additional N-iodosuccinimide (0.70 g, 3.1 mmol) was added and heating was continued for 1 h. The mixture was cooled and poured over ice. The precipitate was isolated by filtration and the crude material was purified by recrystallization from methanol/water. The solid was isolated by filtration, rinsed with water and dried. 5-Chloro-2-hydroxy-3-iodo-benzoic acid 41 was obtained as a tan crystalline solid (6.14 g, 71% yield).

1. temperatureheating
2. temperatureThe mixture was cooled
3. additionpoured over ice
4. customThe precipitate was isolated by filtration
5. customthe crude material was purified by recrystallization from methanol/water
6. customThe solid was isolated by filtration
7. washrinsed with water
8. customdried