反应详情

To a solution of 4-ethyl-2-methoxybenzoic acid (example 18b)(1 g, 6.1 mmol) in pyridine (6 mL) was added EDCI (1.2 g, 6.3 mmol) and the suspension was stirred at r.t. for 2 h. Then thiosemicarbazide (547 mg, 6 mmol) was added and the reaction was stirred at r.t. for 24 h. The mixture was evaporated to dryness and then diluted with water. A white solid was collected and washed with water. The solid was suspended in aq. NaHCO3 (1M, 20 mL) and heated at reflux for 2 days. The suspension was filtered hot and the aqueous solution was cooled in ice and acidified to pH 3 with conc. HCl. The solid was collected washed with water and dried to give 5-(4-ethyl-2-methoxyphenyl)-2H-1,2,4-triazole-3(4H)-thione as a white powder (55%). MS (M+H, 236).

1. stirringthe reaction was stirred at r.t. for 24 h
2. customThe mixture was evaporated to dryness
3. additiondiluted with water
4. customA white solid was collected
5. washwashed with water
6. temperatureheated
7. temperatureat reflux for 2 days
8. filtrationThe suspension was filtered hot
9. temperaturethe aqueous solution was cooled in ice
10. customThe solid was collected
11. washwashed with water
12. customdried