反应详情

Boil 40 g of 2-(α-ethoxycarbonyl-4-chlorobenzylidene)-1-methylpyrrolidine and 150 ml of conc. hydrochloric acid under reflux until the cessation of evolution of carbon dioxide. Cool the thus-obtained reaction mixture and then render it alkaline with 10% strength solution of sodium hydroxide before extracting the resulting product with 5×70 ml of diethyl ether. After drying over sodium sulfate, concentrate the ether extract to a solid residue. Hydrogenate the solid residue in 550 ml of ethanol with Pt/hydrogen to obtain 27.6 g of the title compound having a boiling point of 75° at 0.005 mm of Hg.

1. temperatureCool
2. customthe thus-obtained reaction mixture
3. extractionbefore extracting the resulting product with 5×70 ml of diethyl ether
4. dry with materialAfter drying over sodium sulfate
5. concentrationconcentrate the ether
6. extractionextract to a solid residue