反应详情

A solution of (4-chloro-phenyl)-(neopentyl)-amine (2.24 g, 11.3 mmol) in benzene (6 mL) was added to a solution of boron trichloride (1.0 M in xylenes; 12.5 mL, 12.5 mmol) in benzene (13 mL) at 0° C. under a nitrogen atmosphere. Once the addition was complete, the resulting mixture was heated at reflux for 3 hours, under a steady stream of nitrogen exiting into an aqueous 5N sodium hydroxide trap, and then recooled to 0° C. A solution of 2,3-ethylenedioxybenzaldehyde (1.86 g, 11.3 mmol), triethylamine (2.29 g, 22.7 mmol, 3.2 mL) and benzene (6 mL) was then added and the resulting mixture stirred 3.5 hours before quenching with aqueous 1N hydrochloric acid. After 1 hour, ethyl acetate was added and the resulting mixture was shaken vigorously. The aqueous layer was alkalized with aqueous 5N sodium hydroxide and the layers separated. The aqueous layer was extracted with ethyl acetate (2×). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, concentrated under reduced pressure, and purified by flash column chromatography (4:1 hexanes/ethyl acetate) to produce 3.62 g (88%) of the title compound as an off-white foam.

1. additionOnce the addition
2. temperaturethe resulting mixture was heated
3. temperatureat reflux for 3 hours, under a steady stream of nitrogen exiting into an aqueous 5N sodium hydroxide trap
4. customrecooled to 0° C
5. custombefore quenching with aqueous 1N hydrochloric acid
6. waitAfter 1 hour
7. additionethyl acetate was added
8. stirringthe resulting mixture was shaken vigorously
9. customthe layers separated
10. extractionThe aqueous layer was extracted with ethyl acetate (2×)
11. dry with materialdried over anhydrous sodium sulfate
12. filtrationfiltered
13. concentrationconcentrated under reduced pressure
14. custompurified by flash column chromatography (4:1 hexanes/ethyl acetate)