Water → (R)-N-(thiazolo[5,4-b]pyridin-2-yl)-4H-1'-azaspiro[oxazole-5,3'-bicyclo[2.2.2]octan]-2-amine

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Reaction Conditions

Reaction Steps

A mixture of dimethyl thiazolo[5,4-b]pyridin-2-ylcarbonimidodithioate (90 mg, 0.35 mmol), (S)-3-(aminomethyl)quinuclidin-3-ol dihydrochloride (97 mg, 0.42 mmol) and cesium carbonate (230 mg, 0.71 mmol) in DMF (1 mL) was heated to 100° C. for 2 hours. The reaction mixture was cooled to ambient temperature, poured into water and extracted with chloroform (4×). The combined organics were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The mixture was purified by silica gel chromatography (2-40% 9:1 methanol:ammonium hydroxide-chloroform). The product fractions were combined and concentrated in vacuo to afford (R)—N-(thiazolo[5,4-b]pyridin-2-yl)-4H-1′-azaspiro[oxazole-5,3′-bicyclo[2.2.2]octan]-2-amine (84 mg, 76% yield). 1H NMR (400 MHz, CDCl3) δ ppm 9.30 (br. s., 1 H) 8.37 (dd, J=4.77, 1.51 Hz, 1 H) 7.82 (dd, J=8.03, 1.51 Hz, 1 H) 7.28 (dd, J=8.03, 4.77 Hz, 1 H) 4.05 (d, J=9.54 Hz, 1 H) 3.70 (d, J=9.54 Hz, 1 H) 3.42 (dd, J=15.06, 1.76 Hz, 1 H) 2.75-3.07 (m, 5 H) 2.14-2.26 (m, 2 H) 1.71-1.84 (m, J=13.99, 9.79, 4.17, 4.17 Hz, 1 H) 1.48-1.68 (m, 2 H). MS (LC/MS) R.T.=0.64; [M+H]+=316.15.

Provenance & Evidence