反应 #955932

反应方程式

NaHCO3

2,4-dimethylbenzohydrazide

cyanic bromide

→

5-(2,4-Dimethylphenyl)-1,3,4-oxadiazol-2-amine

收率 82.0%

溶剂

water

dioxane

反应条件

后处理

1. 1
   浓缩The solution was concentrated
2. 2
   workup.ADDITIONdiluted with water (20 mL)
3. 3
   其他The resulting solid was collected
4. 4
   其他dried on vacuum

实验过程

To a solution of 2,4-dimethylbenzohydrazide (example 16b) (2 g) in dry dioxane (12 mL) was added cyanic bromide (1.28 g, 12.2 mmol) followed by a solution of NaHCO3 (1.02 g, 12.2 mmol) in water (12 mL). The resulting mixture was stirred 2 hours at rt. The solution was concentrated to ½ volume on vacuum and diluted with water (20 mL). The resulting solid was collected and dried on vacuum to give 5-(2,4-Dimethylphenyl)-1,3,4-oxadiazol-2-amine (1.88 g, 82%) as a white solid. 1H NMR (300 MHz, dMSO): δ 2.29 (s, 3H), 2.52 (d, 3H), 7.13 (d, 1H), 7.16 (s, 3H), 7.54-7.56 (d, 1H); MS (M+H, 190).

来源