反应详情

4-Chloro-2-(piperidine-4-carboxamido)anisole (10.4 g) was dissolved in a mixture of acetic acid (100 ml) and concentrated sulphuric acid (5 ml). Fuming nitric acid (2.1 ml) was added dropwise, keeping the temperature below 30°. The solution was stirred at room temperature for 2 hr, poured onto crushed ice (ca 500 ml) and basified with 40% sodium hydroxide. The mixture was extracted with ethyl acetate (2×250 ml), the extracts dried (K2CO3) and solvent removed at the pump. The brown residue was crystallised from ethyl acetate and petroleum ether (b.p. 60°-80°), giving 4-chloro-5-nitro-2-(piperidine-4-carboxamido)anisole as brown plates (e17) (9.9 g, 82%), m.p. 167°-170°.

1. customthe temperature below 30°
2. additionpoured
3. extractionThe mixture was extracted with ethyl acetate (2×250 ml)
4. dry with materialthe extracts dried (K2CO3) and solvent
5. customremoved at the pump
6. customThe brown residue was crystallised from ethyl acetate and petroleum ether (b.p. 60°-80°)