Triethylamine → tert-Butyl (2-((4-fluorobenzyl)amino)ethyl)carbamate

Temperatur

0 °C

(2-Amino-ethyl)-carbamic acid tert-butyl ester (5.95 g, 37.1 mmol), 4-fluorobenzaldehyde (5.07 g, 40.9 mmol, 4.4 mL), triethylamine (1.50 g, 14.9 mmol, 2.1 mL) and magnesium sulfate (6.71 g, 55.7 mmol) were stirred in methanol (50 mL). After 1.5 h the solution was cooled to 0° C. and sodium borohydride (8.4 g, 223 mmol) was added in portions. After 2 h the reaction was quenched with water and extracted three times with ethyl acetate. The combined organic layers were washed three times with water and the desired product extracted into the aqueous layer with 0.5 M hydrochloric acid (4×50 mL). The combined acid wash was cooled to 0° C. and basified with saturated aqueous ammonium hydroxide. The aqueous layer was extracted three times with chloroform and the combined chloroform layer washed three times with water, dried over sodium sulfate and concentrated to yield the title compound as a colorless oil (7.49 g).

1. customAfter 2 h the reaction was quenched with water
2. extractionextracted three times with ethyl acetate
3. washThe combined organic layers were washed three times with water
4. extractionthe desired product extracted into the aqueous layer with 0.5 M hydrochloric acid (4×50 mL)
5. washThe combined acid wash
6. temperaturewas cooled to 0° C.
7. extractionThe aqueous layer was extracted three times with chloroform
8. washthe combined chloroform layer washed three times with water
9. dry with materialdried over sodium sulfate
10. concentrationconcentrated

ORD-Eintrag

ord-158855797d49424f8b144c953e5c3e29

Quelldatensatz

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07098212B2