Triethylamine → (R)-6-(4H-1'-azaspiro[oxazole-5,3'-bicyclo[2.2.2]octane]-2-ylamino)-2-methylnicotinonitrile

Participants

Reaction Conditions

Reaction Steps

To 6-isothiocyanato-2-methylnicotinonitrile (0.25 g, 1.43 mmol) in N,N-dimethylformamide (20 mL) was added triethylamine (0.5 mL, 3.666 mmol) and 3-(aminomethyl)quinuclidin-3-ol dihydrochloride (0.33 g, 1.46 mmol) at room temperature. The reaction was stirred at 70° C. for 2 hours. The reaction was cooled to room temperature and concentrated in vacuo. The crude urea was purified by chromatography (Biotage: 85% CHCl3, 14% MeOH, 1% NH4OH). The product was then treated with N,N-dimethylformamide (20 mL) and N,N′-diisopropylcarbodiimide (0.67 mL, 4.28 mmol). The reaction was heated to 70° C. for 2 hours. The reaction was cooled to room temperature and concentrated in vacuo to yield the crude product. The crude product was purified by chromatography (Biotage: 85% CHCl3, 14% MeOH, 1% NH4OH) to yield (R)-6-(4H-1′-azaspiro[oxazole-5,3′-bicyclo[2.2.2]octane]-2-ylamino)-2-methylnicotinonitrile (0.09 g, 0.3 mmol, 21% yield) as a white powder. 1H NMR (500 MHz, DMSO-D6) δ ppm 9.11 (s, 1 H), 7.87 (d, J=7.93 Hz, 2 H), 6.69 (s, 1 H), 3.89 (d, J=10.38 Hz, 2 H), 3.63 (d, J=10.38 Hz, 3 H), 3.00 (s, 5 H), 2.72-2.80 (m, 4 H), 2.64-2.69 (m, 5 H), 2.60 (s, 7 H), 2.00 (d, J=2.14 Hz, 3 H), 1.91 (s, 1 H), 1.87 (s, 2 H), 1.58 (s, 5 H), 1.42-1.50 (m, 2 H). MS (LC/MS) R.T.=0.48; [M+H]+=298.13.

Provenance & Evidence