تفاعل #66126

معادلة التفاعل

sodium bicarbonate

1-(4-amino-phenyl)-piperidin-4-one

sodium nitrite

hypophosphorus acid

→

1-phenyl-piperidin-4-one

المردود 15.0%

المذيبات

hydrochloric acid

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe mixture then being warmed to ambient temperature
2. 2
   workup.STIRRINGstirred for 2 h
3. 3
   استخلاصextracted with ethyl acetate
4. 4
   غسيلThe organic layer was washed with water, brine solution
5. 5
   تجفيفdried over anhydrous sodium sulfate
6. 6
   تركيزconcentrated
7. 7
   أخرىto give a residue which
8. 8
   أخرىwas purified by column chromatography over silica gel (60-120 mesh)

الإجراء التجريبي

A solution of 1-(4-amino-phenyl)-piperidin-4-one (1.34 g, 7.05 mmol) in 50% hydrochloric acid (10 mL) was stirred at ambient temperature for 15 min. The reaction mixture was cooled to 0° C. and a solution of sodium nitrite (1.46 g) in water (5 mL) added and stirred for 30 min. To this reaction mixture was added cold 30-32% hypophosphorus acid (10 mL), the mixture then being warmed to ambient temperature and stirred for 2 h. The reaction mixture was neutralised with saturated sodium bicarbonate solution and extracted with ethyl acetate. The organic layer was washed with water, brine solution, dried over anhydrous sodium sulfate and concentrated to give a residue which was purified by column chromatography over silica gel (60-120 mesh) using 17% ethyl acetate in petroleum ether as eluent to afford 1-phenyl-piperidin-4-one (0.18 g, 15%) as a liquid.

المصدر