反应 #89789

反应方程式

4-hydrazinobenzoic acid

isopropylmethylketone

→

desired product

收率 80.1%

2,3,3-Trimethyl-5-carboxy-3H-indole

收率 80.1%

溶剂

acetic acid

反应条件

后处理

1. 1
   温度under reflux in an oil bath for 20 h
2. 2
   其他was evaporated off under reduced pressure and to it
3. 3
   workup.ADDITIONwas added a saturated aqueous solution of NaHCO3 (50 mL)
4. 4
   洗涤washed with CH2Cl2 (3×40 mL)
5. 5
   萃取extracted with CH2Cl2 (3×50 mL)
6. 6
   干燥The combined organic solution was then dried with Na2SO4
7. 7
   过滤filtered
8. 8
   浓缩concentrated to dryness under reduced pressure

实验过程

A solution of 4-hydrazinobenzoic acid (10.0 g, 65.7 mmol), isopropylmethylketone (21.1 mL, 197 mmol) in acetic acid (35 mL) was heated under reflux in an oil bath for 20 h. After cooling to ambient temperature the solvent was evaporated off under reduced pressure and to it was added a saturated aqueous solution of NaHCO3 (50 mL) and washed with CH2Cl2 (3×40 mL). The pH of the aqueous solution was adjusted with 1 M aqueous HCl to ca. 2, and then extracted with CH2Cl2 (3×50 mL). The combined organic solution was then dried with Na2SO4, filtered and concentrated to dryness under reduced pressure to yield the desired product (10.7 g, 80%) as a brownish solid.

来源