Ethanolamine → 1-{5-[6-(2-Hydroxy-ethylamino)-imidazo[1,2-b]pyridazin-3-yl]-thiophen-2-yl}-ethanone

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Reaction Conditions

Reaction Steps

Cesium carbonate [534-17-8] (150 mg, 0.5 mmol) was added to a solution of 1-[5-(6-fluoro-imidazo[1,2-b]pyridazin-3-yl)-thiophen-2-yl]-ethanone (60 mg, 0.2 mmol) and ethanolamine [141-43-5] (29 mg, 0.5 mmol) in N,N-dimethylformamide (3 mL). The mixture was stirred at 40° C. for 1 h then partitioned between ethyl acetate and water. Analysis of the organic extract revealed preparation ratio of the desired arylamine product to the ether to be approximately 2:1. Preparative RP-HPLC isolated 22 mg of 1-{5-[6-(2-hydroxy-ethylamino)-imidazo[1,2-b]pyridazin-3-yl]-thiophen-2-yl}-ethanone as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.83 (s, 3H) 2.57 (s, 2H) 3.04 (t, J=5.68 Hz, 1H) 4.43 (t, J=5.68 Hz, 1H) 7.04 (d, J=9.60 Hz, 1H) 7.91 (d, J=4.04 Hz, 1H) 8.03 (d, J=4.04 Hz, 1H) 8.16 (d, J=9.60 Hz, 1H) 8.36 (s, 1H). LRMS (ESI) m/z 303.1 [(M+H)]+, calc'd for C14H14N4O2S: 302.36.

Provenance & Evidence