Trifluoroacetic acid → Methyl 8-bromo-1,2,3,4-tetrahydro-1-benzazocine-5-carboxylate

Temperatur

65 °C

To a solution of methyl 8-bromo-1-(4-methoxybenzyl)-1,2,3,4-terahydro-1-benzoazocine-5-carboxylate (10.0 g), in toluene (50 ml) was added trifluoroacetic acid (50 ml), and the mixture was stirred at 65° C. for 2 hours. After distilling off the solvent under reduced pressure, water was added at 0° C. and the reaction mixture was neutralized with potassium carbonate and extracted with ethyl acetate. The organic layer was washed with aqueous saturated sodium bicarbonate solution and saturated brine, after which it was dried with magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=9:1). The resulting solid was washed with hexane to give methyl 8-bromo-1,2,3,4-terahydro-1-benzoazocine-5-carboxylate (6.59 g) as yellow crystals.

1. distillationAfter distilling off the solvent under reduced pressure, water
2. additionwas added at 0° C.
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with aqueous saturated sodium bicarbonate solution and saturated brine
5. dry with materialafter which it was dried with magnesium sulfate
6. distillationThe solvent was distilled off under reduced pressure
7. customthe resulting residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=9:1)
8. washThe resulting solid was washed with hexane

ORD-Eintrag

ord-7ad61db351194b358a630d41ef563d8d

Quelldatensatz

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08183273B2