反应详情

A mixture of 3,5-dibromopyridin-2-amine (2.51 g, 10 mmol) and ethyl 3-bromo-2-oxopropanoate (2.5 g, 13 mmol) in THF (50 mL) was heated at reflux 48 hrs. The solution was evaporated and the residue triturated with ether and the resulting solid was filtered and dried to give ethyl 6,8-dibromoimidazo[1,2-a]pyridine-2-carboxylate hydrobromide (3.0 g, 69% yield). LCMS (Conditions C): 2.70 min (RT); (M+H)+=347.09 (60%), 349.09 (100%), 351.08 (60%). 1H NMR, 400 MHz, CDCl3: δ 8.39 (d, 1.5 Hz, 1 H), 8.28 (s, 1 H), 7.67 (d, 1.5 Hz, 1 H), 4.46 (q, J=7.0 Hz, 2 H), 1.43 (t, J=7.0 Hz, 3 H).

1. temperaturewas heated
2. temperatureat reflux 48 hrs
3. customThe solution was evaporated
4. customthe residue triturated with ether
5. filtrationthe resulting solid was filtered
6. customdried