Ammonium Hydroxide → 3-(2-Aminoethoxy)pyridine

Temperatur

125 °C

The 2-chloro-1-(3-pyridyloxy)ethane (1.23 g, 7.80 mmol) was dissolved in methanol (25 mL) and added to concentrated ammonium hydroxide solution (29.7%, 14.8 M, 55 mL) in a heavy-walled glass pressure-tube apparatus. The tube was sealed and the mixture was stirred and heated at 125° C. (oil bath temperature) for 42 h. After cooling, the mixture was concentrated by rotary evaporation. Saturated NaCl solution (10 mL) was added to the residue, and the solution (pH 6) was extracted with ether (3×25 mL) to remove impurities. The aqueous layer was diluted with saturated NaCl solution (15 mL) and basified to pH 12 with 10% NaOH solution (5 mL). The mixture was extracted with chloroform (4×50 mL). The combined light-yellow chloroform extracts were dried (Na2SO4), filtered, and concentrated by rotary evaporation to a residue that was dried briefly under high vacuum to give 0.390 g (36.2%) of a light-yellow oil.

1. customThe tube was sealed
2. temperatureAfter cooling
3. concentrationthe mixture was concentrated by rotary evaporation
4. additionSaturated NaCl solution (10 mL) was added to the residue
5. extractionthe solution (pH 6) was extracted with ether (3×25 mL)
6. customto remove impurities
7. additionThe aqueous layer was diluted with saturated NaCl solution (15 mL)
8. extractionThe mixture was extracted with chloroform (4×50 mL)
9. dry with materialThe combined light-yellow chloroform extracts were dried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated by rotary evaporation to a residue that
12. customwas dried briefly under high vacuum

ORD-Eintrag

ord-69a7fcc8ec5447f89f919519560334ad

Quelldatensatz

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06441006B2