Water → (R)-N5,N5-dimethyl-N2-(4H-1'-azaspiro[oxazole-5,3'-bicyclo[2.2.2]octane]-2-yl)thiazolo[5,4-d]pyrimidine-2,5-diamine

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Reaction Conditions

Reaction Steps

A mixture of dimethyl 5-(dimethylamino)thiazolo[5,4-d]pyrimidin-2-ylcarbonimidodithioate (90 mg, 0.301 mmol), (S)-3-(aminomethyl)quinuclidin-3-ol dihydrochloride (83 mg, 0.361 mmol) and cesium carbonate (196 mg, 0.60 mmol) in DMF (1.0 mL) was heated to 100° C. for 1.5 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, concentrated in vacuo, and the crude residue was purified by silica gel chromatography (2-40% 9:1 methanol: ammonium hydroxide-chloroform) to afford (R)—N5,N5-dimethyl-N2-(4H-1′-azaspiro[oxazole-5,3′-bicyclo[2.2.2]octane]-2-yl)thiazolo[5,4-d]pyrimidine-2,5-diamine (81 mg, 71% yield) as a tan solid. 1H NMR (400 MHz, CDCl3) δ ppm 9.07 (br. s., 1H) 8.50 (s, 1H) 4.01 (d, J=9.54 Hz, 1H) 3.67 (d, J=9.54 Hz, 1H) 3.39 (dd, J=14.93, 1.63 Hz, 1H) 3.23 (s, 6H) 2.71-3.10 (m, 5H) 2.10-2.24 (m, 2H) 1.68-1.84 (m, 1H) 1.46-1.68 (m, 2H). MS (LC/MS) R.T.=0.87; [M+H]+=360.23.

Provenance & Evidence