Hydrochloric Acid → 3-(5-Pyrimidinyl)-1-azabicyclo[2.2.2]octan-3-ol

Temperature

-110 °C

n-Butyllithium (12 ml of a 1.6M solution in hexane 19.2 mmol), at -110° C., was added dropwise to a solution of 5-bromopyrimidine (2.0 g, 12.5 mmol) in THF (60 ml) and ether (60 ml), at -110° C. (ethanol/liquid nitrogen bath). The resultant yellow solution was stirred at -110° C. for 1.25 h and a solution of quinuclidinone (1.72 g, 13.75 mmol) in THF (20 ml) also at -110° C., added dropwise. The reaction mixture was stirred at -110° C. for 0.1 h then warmed to room temperature and stirred for 16 h. 2N-Hydrochloric acid (25 ml) was added and stirred for 0.25 h. The organic phase was washed with water (15 ml) and the combined aqueous extracts basified with potassium carbonate and extracted with dichloromethane (4×75 ml). Chromatography of the residue obtained upon removal of the solvents through alumina using dichloromethane/methanol (90:10) as eluant, gave 3-(5-pyrimidinyl)-1-azabicyclo[2.2.2]octan-3-ol as a yellow solid, m.p. 126°-127° C. (ethyl acetate/ether); (Found C,61.42; H,7.47; N,19.60. C11H15N3O. O.5H2O requires C,61.66; H,7.53; N,19.61%); m/e 205(M+); δ (360 MHz,D2O) 1.30-1.44(1H,m,0.5×CH2); 1.65-1.74(2H,m,CH2); 2.10-2.20(1H,m,0.5×CH2); 2.30-2.32(1H,m,CH-bridgehead); 2.68-2.96(4H,m,2×CH2); 3.09(1H,dd,J=1.5 and 14.7 Hz, 0.5×CH2); 3.49(1H,dd,J=1.5 and 14.7 Hz,0,5×CH2); 8.96(2H,s,pyrimidine-H); 9.08(1H,s,pyrimidine-H).

1. stirringThe reaction mixture was stirred at -110° C. for 0.1 h
2. temperaturethen warmed to room temperature
3. stirringstirred for 16 h
4. stirringstirred for 0.25 h
5. washThe organic phase was washed with water (15 ml)
6. extractionextracted with dichloromethane (4×75 ml)
7. customChromatography of the residue obtained upon removal of the solvents through alumina

ORD record

ord-5c6b7fcd621a4835b4374bd88705bd16

Source dataset

uspto-grants-1993_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05260293