Cesium carbonate → (R)-N-(6-methoxypyrimidin-4-yl)-4H-1'-azaspiro[oxazole-5,3'-bicyclo[2.2.2]octan]-2-amine

To (S)-3-(aminomethyl)quinuclidin-3-ol dihydrochloride (0.363 g, 1.583 mmol) in N,N-dimethylformamide (20 mL) was added Cs2CO3 (1.289 g, 3.96 mmol) and 4-isothiocyanato-6-(3-methoxyphenyl)pyrimidine. The suspension was stirred at room temperature for 30 minutes. N,N′-diisopropylcarbodiimide (0.740 mL, 4.75 mmol) was then added and the mixture was continued to stir at room temperature for 18 hours. The mixture was concentrated and purified by silica gel chromatography (5-25% 9:1 methanol:ammonium hydroxide-ethyl acetate) to afford (R)—N-(6-methoxypyrimidin-4-yl)-4H-1′-azaspiro[oxazole-5,3′-bicyclo[2.2.2]octan]-2-amine (0.294 g, 0.788 mmol, 50% yield) as a a pale yellow solid. M.P 80-5° C. 1H NMR (400 MHz, MeOD) δ ppm 8.77 (1 H, s), 7.47-7.58 (2 H, m), 7.39 (1 H, t), 7.20 (1 H, br. s.), 7.04 (1 H, dd), 4.05 (1 H, d), 3.85 (3 H, s), 3.74 (1 H, d), 3.23 (1 H, d), 3.10 (1 H, d), 2.71-3.00 (4 H, m), 2.03-2.22 (2 H, m), 1.53-1.85 (3 H, m). MS (LC/MS) R.T.=1.58; [M+H]+=366.15.

1. stirringto stir at room temperature for 18 hours
2. concentrationThe mixture was concentrated
3. custompurified by silica gel chromatography (5-25% 9:1 methanol:ammonium hydroxide-ethyl acetate)

ORD record

ord-240873535d14424c8b2a06d890686fdc

Source dataset

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07863291B2