反应详情

Under a nitrogen atmosphere a stirred solution of 4.8 grams (0.014 mole) of 5-hydroxy-5-[3-(4-trifluoromethylphenyl)phenyl]hexanenitrile in 40 mL (0.760 mole) of acetonitrile was cooled to 0° C., and 9.4 grams (0.086 mole) of trimethyl-silyl chloride was added slowly. Upon completion of addition, the reaction mixture was stirred for about 15 minutes, and then 40 mL of hexane was added. After this time the reaction mixture was again stirred for 15 minutes, and 13.0 grams (0.086 mole) of sodium iodide was added. The reaction mixture was then stirred as it was allowed to warm to ambient temperature. Thin layer chromatographic analysis of the reaction mixture indicated that the reaction was not complete. The reaction mixture was then warmed to reflux where it stirred for two hours. After this time the reaction mixture was allowed to cool to ambient temperature as it stirred for about 18 hours. The reaction mixture was then partitioned between ethyl acetate and water. The organic layer was separated and washed with an aqueous dilute solution of sodium metabisulfite to remove iodine. The organic layer was then dried with sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue. The residue was subjected to column chromatography on silica gel, using 25% ethyl acetate in hexane as the eluant. The product-containing fractions were combined and concentrated under reduced pressure, yielding about 3.2 grams of 5-[3-(4-trifluoromethylphenyl)phenyl]hexanenitrile. The NMR spectrum was consistent with the proposed structure.

1. additionUpon completion of addition
2. stirringAfter this time the reaction mixture was again stirred for 15 minutes
3. stirringThe reaction mixture was then stirred as it
4. temperatureThe reaction mixture was then warmed
5. temperatureto reflux where it
6. stirringstirred for two hours
7. temperatureto cool to ambient temperature as it
8. stirringstirred for about 18 hours
9. customThe reaction mixture was then partitioned between ethyl acetate and water
10. customThe organic layer was separated
11. washwashed with an aqueous dilute solution of sodium metabisulfite
12. customto remove iodine
13. dry with materialThe organic layer was then dried with sodium sulfate
14. filtrationfiltered
15. concentrationThe filtrate was concentrated under reduced pressure to a residue
16. concentrationconcentrated under reduced pressure