反应详情

A stirred suspension of 5.2 g of 2,3-dihydro-5-nitrospiro[benzofuran-2,4'-piperidine] free base of C, 7.0 g of potassium carbonate, a few grains of potassium iodide and 6.2 g of γ-chloro-p-fluorobutyrophenone ethylene ketal in 200 ml of n-butyl alcohol is refluxed for 24 hours. Thereafter, the reaction mixture is permitted to cool to ambient temperature and then filtered. The filtrate is evaporated to dryness, leaving a brown oil. The oil is dissolved in 200 ml of methyl alcohol and 100 ml of 3N hydrochloric acid and this solution is stirred at ambient temperature for 18 hours and then basified with 6 N sodium hydroxide. The alkaline mixture is extracted with ethyl acetate and the ethyl acetate extracts are successively dried and evaporated to dryness, leaving an oil. The oil is chromatographed on a silica gel column eluting with chloroform which leads to a solid. The solid is dissolved in ether where it is converted to its hydrochloric acid salt, a white precipitate. The precipitate is recrystallized twice from ethyl alcohol to give the product 2,3-dihydro-1'-[3-(4-fluorobenzoyl)propyl]-5-nitrospiro[benzofuran-2,4'-piperidine]hydrochloride, mp 245°-247° C.

1. filtrationfiltered
2. customThe filtrate is evaporated to dryness
3. customleaving a brown oil
4. extractionThe alkaline mixture is extracted with ethyl acetate
5. dry with materialthe ethyl acetate extracts are successively dried
6. customevaporated to dryness
7. customleaving an oil
8. customThe oil is chromatographed on a silica gel column
9. washeluting with chloroform which
10. dissolutionThe solid is dissolved in ether where it
11. customThe precipitate is recrystallized twice from ethyl alcohol