反应详情

Add a solution of 8.1 g of sodium in 160 ml of ethanol dropwise at 90°, with stirring, in a stream of nitrogen to 83.4 g of 2-dimethylamino-1-methyl-1-pyrrolinium-methylsulfate and 48.3 g of 3-methoxyphenylacetic acid ethyl ester. Stir the resulting reaction mixture for a further 30 minutes at 90° and then distribute the reaction mixture between 300 ml of water and 300 ml of diethyl ether. Concentrate the ether phase and boil the residue with conc. hydrochloric acid until carbon dioxide ceases to evolve. After cooling, alkalize the boiled residue with 6 N sodium hydroxide solution before extracting it with diethyl ether. Dry the ether extract over sodium sulfate; concentrate it, and reduce the concentrate in methanol with platinum/hydrogen. Separate the catalyst by filtration, concentrate the filtrate and distil to obtain a yield of 23.0 g (45% of theory) of title compound (b.p. 88° at 0.005 mm of Hg).

1. customthe resulting reaction mixture for a further 30 minutes at 90°
2. concentrationConcentrate the ether phase
3. temperatureAfter cooling
4. extractionbefore extracting it with diethyl ether
5. dry with materialDry the ether
6. extractionextract over sodium sulfate
7. concentrationconcentrate it
8. concentrationconcentrate in methanol with platinum/hydrogen
9. customSeparate the catalyst
10. filtrationby filtration
11. concentrationconcentrate the filtrate
12. customdistil