反应详情

A stirred solution of 15.3 grams (0.077 mole) of (4-(2-pyridyloxy)phenyl)formaldehyde (a known compound) in 150 mL of methanol was cooled to 0-5° C., and 3.2 grams (0.085 mole) of sodium borohydride was added portion wise. Upon completion of addition, the reaction mixture was allowed to warm to ambient temperature where it stirred for 30 minutes. After this time, the reaction mixture was cooled to 5° C. and 150 mL of water was carefully added to destroy excess sodium borohydride. The mixture was cooled to 0° C. and neutralized with concentrated hydrochloric acid. Excess acid was added causing the mixture to be acidic. The mixture was brought to neutrality by the addition of solid sodium bicarbonate. The mixture was concentrated under reduced pressure to remove some of the methanol. The concentrate was taken up in ethyl acetate and washed with an aqueous solution saturated with sodium chloride. The organic layer was dried with sodium sulfate, filtered, and concentrated under reduced pressure, yielding 12.6 grams of the subject compound. The NMR spectrum was consistent with the proposed structure.

1. additionUpon completion of addition
2. temperatureAfter this time, the reaction mixture was cooled to 5° C.
3. customto destroy excess sodium borohydride
4. temperatureThe mixture was cooled to 0° C. and neutralized with concentrated hydrochloric acid
5. additionExcess acid was added
6. additionThe mixture was brought to neutrality by the addition of solid sodium bicarbonate
7. concentrationThe mixture was concentrated under reduced pressure
8. customto remove some of the methanol
9. washwashed with an aqueous solution saturated with sodium chloride
10. dry with materialThe organic layer was dried with sodium sulfate
11. filtrationfiltered
12. concentrationconcentrated under reduced pressure