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

Participants

Reaction Conditions

Reaction Steps

A mixture of dimethyl 5-(benzyloxy)thiazolo[5,4-b]pyridin-2-ylcarbonimidodithioate (500 mg, 1.38 mmol), (S)-3-(aminomethyl)quinuclidin-3-ol dihydrochloride (317 mg, 1.38 mmol) and cesium carbonate (1.0 g, 3.07 mmol) in DMF (7 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 (2-20% [9:1 methanol:ammonium hydroxide]-chloroform) to afford (R)—N-(5-(benzyloxy)thiazolo[5,4-b]pyridin-2-yl)-4H-1′-azaspiro[oxazole-5,3′-bicyclo[2.2.2]octan]-2-amine (390 mg, 67% yield). 1H NMR (500 MHz, CDCl3) δ ppm 9.18 (br. s., 1 H) 7.76 (d, J=8.85 Hz, 1 H) 7.50 (d, J=7.32 Hz, 2 H) 7.41 (t, J=7.32 Hz, 2 H) 7.32-7.37 (m, 1 H) 5.42 (s, 2 H) 4.02 (d, J=9.46 Hz, 1 H) 3.68 (d, J=9.46 Hz, 1 H) 3.37-3.44 (m, 1 H) 2.75-3.06 (m, 5 H) 2.13-2.25 (m, 2 H) 1.73-1.82 (m, 1 H) 1.49-1.70 (m, 3 H). MS (LC/MS) R.T.=1.69; [M+H]+=421.98.

Provenance & Evidence