反应详情

温度

0 °C

tert-Butyllithium (0.978 mL, 1.7M/pentane) was added to a cooled (-78° C.) THF (5 mL) solution of 7-methyl-2-propylimidazo[4,5-b]pyridine (97 mg, 0.554 mmol). After 2 hour the reaction was warmed to 0° C. for 1 minute then cooled back to -78° C. MeI (0.172 mL) was added, the mixture was stirred at -78° C. for 1 hour then warmed to 0° C. for 1 minute and then quenched (NH4OH). Extractive workup and purification (SiO2, 2% MeOH/ EtOAc) gave 85 mg of 7-ethyl-2-propylimidazo[4,5-b]pyridine which was converted to the title compound as outlined in Example 7, Part B. 1H NMR (250 MHz, CD3OD) δ8.28 (d, 1H, J=6 Hz), 7.72-7.65 (m, 2H), 7.62-7.54 (m, 2H), 7.22 (d, 1H, J=6 Hz), 7.17-7.08 (AB q, 4H), 5.61 (s, 2H), 3.12 (q, 2H, J=9 Hz), 2.89 (t, 2H, J=9 Hz), 1.80-1.63 (m, 2H), 1.41 (t, 3H, J=9 Hz), 0.99 (t, 3H, J=9 Hz).

1. temperaturethen cooled back to -78° C
2. temperaturethen warmed to 0° C. for 1 minute
3. customquenched (NH4OH)
4. customExtractive workup and purification (SiO2, 2% MeOH/ EtOAc)