Reacción #60501

Ecuación de reacción

water

3-chloro-4-fluoronitrobenzene

1-piperazinecarboxylic acid t-butyl ester

dimethylformamide

→

title compound

Rendimiento 64.7%

4-(2-Chloro-4-nitrophenyl)piperazine-1-carboxylic acid t-butyl ester

Rendimiento 64.7%

Disolventes

chloroform

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroto the air-cooled reaction mixture, extraction
2. 2
   LavadoThe organic layers were washed with brine
3. 3
   Secadodried over anhydrous magnesium sulfate
4. 4
   FiltraciónThe desiccant was filtered off
5. 5
   Concentraciónthe filtrate was concentrated under reduced pressure
6. 6
   OtroThe residue was purified by silica gel colurn chromatography (ethyl acetate/heptane)

Procedimiento

A mixture of 3-chloro-4-fluoronitrobenzene (5 g, 27.1 mmol), 1-piperazinecarboxylic acid t-butyl ester (5 g, 26.8 mmol) and dimethylformamide (10 mL) was stirred for 3 hours and 30 minutes at an external temperature of 130° C. After adding water to the air-cooled reaction mixture, extraction was performed 3 times with chloroform. The organic layers were washed with brine and dried over anhydrous magnesium sulfate. The desiccant was filtered off and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel colurn chromatography (ethyl acetate/heptane) to give 5.93 g of the title compound as a yellow solid.

Fuente