Hydrochloric Acid → 2-((3-Pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one hydrochloride

2-((3-Pyridinyl)methylene)-1-azabicyclo[2.2.2]octan-3-one (20 g, 93 mmol) was suspended in methanol (200 mL) and treated with 46 mL of 6N HCl. 10% Palladium on carbon (1.6 g) was added and the mixture was shaken under 25 psi hydrogen for 16 h. The mixture was filtered through Celite and solvent removed from the filtrate by rotary evaporation, to give crude 2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one hydrochloride as a white gum (20 g). This was treated with 2N NaOH (50 mL) and chloroform (50 mL) and stirred for an hour. The chloroform layer was separated and the aqueous phase was treated with 2N NaOH, enough to raise the pH to 10 (about 5 mL), and saturated aqueous NaCl (25 mL). This was extracted with chloroform (3×10 mL), and the combined extracts were dried (MgSO4) and concentrated by rotary evaporation. The residue (18 g) was dissolved in warm ether (320 mL) and cooled to 4° C. The white solid was filtered off, washed with a small portion of cold ether and air dried. Concentration of the filtrate to ˜10% of its former volume and cooling at 4° C. produced a second crop. A combined yield 16 g (79%) was obtained.

1. filtrationThe mixture was filtered through Celite and solvent
2. customremoved from the filtrate by rotary evaporation

ORD-Eintrag

ord-060b61f120914b87a46d05ad74805da0

Quelldatensatz

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08541447B2