反应详情

温度

80 °C

3,5-Diisopropyl-2-methoxymethoxy-phenyl-boronic acid (455 mg, 1.83 mmol), followed by tetrakis(triphenylphosphine)palladium(0) (191 mg, 0.16 mmol), and 2M sodium carbonate solution (3.31 ml, 3.32 mmol) were added to a solution of 3-iodo-imidazo[1,2-a]pyridine-6-carboxylic acid methyl ester (500 mg, 1.66 mmol) in toluene (10 mL). This reaction was then heated to 80° C. overnight, then cooled to ambient temperature and partitioned between brine (10 mL) and ethyl acetate (50 mL). The organic layer was dried over MgSO4 and evaporated to a residue. The residue was purified by silica gel chromatography (5% MeOH in dichlorometlane) to yield 3-(2-ethoxy-3,5-diisopropyl-phenyl)-imidazo[1,2-a]pyridine-6-carboxylic acid methyl ester as a yellow solid (411 mg, 65%). 1H NMR (250 MHz, CDCl3): δ 8.71 (s, 1H), 7.70 (m, 1H), 7.62 (m, 1H), 7.41 (m 1H), 7.19 (d, 1H, J=1.2), 7.08 (d, 1H, J=1.2), 3.85 (s, 3H), 3.38 (m, 1H), 3.29 (q, 2H, J=6.8),2.90 (m, 1H), 1.28 (s, 3H), 1.26 (s, 6H), 1.24 (s, 3H), 0.75 (t, 3H, J=6.8). MS [EI+] 381 (M+H)+.

1. temperaturecooled to ambient temperature
2. custompartitioned between brine (10 mL) and ethyl acetate (50 mL)
3. dry with materialThe organic layer was dried over MgSO4
4. customevaporated to a residue
5. customThe residue was purified by silica gel chromatography (5% MeOH in dichlorometlane)