Ammonium Chloride → HCID 178486613, Verbindung

Temperatur

-78 °C

4-Bromo-1H-imidazol (1.95 g) was dissolved in THF (30 ml) and the mixture was cooled to −78° C. A solution (1.7 M; 20 ml) of t-butyllithium in pentane was added. The mixture was stirred at 0° C. for 1.5 h and again cooled to −78° C. A solution (20 ml) of 6,7-dimethoxy-2-formyl naphthalene (3.32 g) in THF was added and the mixture was warmed from −78° C. to room temperature. The mixture was stirred at room temperature for 16 h and aqueous solution of ammonium chloride was added. The mixture was extracted with ethyl acetate and the organic layer was dried and concentrated. The residue was purified by silica gel column chromatography (eluate, dichloromethane:methanol=10:1) and crystallized from dichloromethane-methanol to give the title compound (1.31 g) as a colorless solid.

1. temperatureagain cooled to −78° C
2. temperaturethe mixture was warmed from −78° C. to room temperature
3. stirringThe mixture was stirred at room temperature for 16 h
4. extractionThe mixture was extracted with ethyl acetate
5. customthe organic layer was dried
6. concentrationconcentrated
7. customThe residue was purified by silica gel column chromatography (eluate, dichloromethane:methanol=10:1)
8. customcrystallized from dichloromethane-methanol

ORD-Eintrag

ord-888f94468acc44caba01f1874b675f03

Quelldatensatz

uspto-grants-2004_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06800778B1