反应详情

A solution of methyl 2-methyl-4-[(E)-2-nitroethenyl]phenyl ether (7.89 g; 40.88 mmol) in dry THF (50 ml) was added to borane (245 ml of 1M solution in THF; 245 mmol), under nitrogen, dropwise over 20 minutes. The reaction mixture was then heated to 90C. After 14 hr it was cooled to rt and ice-cold water (100 ml) was added dropwise over 30 minutes. The pH was adjusted to ˜2 with 1N HCl and heated to reflux for 5 hr. Upon cooling, the reaction mixture was extracted with ethyl ether (2×300 ml) and the ether phases were discarded. The pH of the aqueous phase was adjusted to 10 with 1N NaOH and extracted with ethyl ether (2×200 ml). The combined organic phases were dried over MgSO4, filtered and concentrated to provide 2-(4-methoxy-3-methylphenyl)ethanamine (5.46 g; 81% yield), which was used without any further purification.

1. temperatureheated
2. temperatureto reflux for 5 hr
3. temperatureUpon cooling
4. extractionthe reaction mixture was extracted with ethyl ether (2×300 ml)
5. extractionextracted with ethyl ether (2×200 ml)
6. dry with materialThe combined organic phases were dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated