反应详情

3-[3-(Pyridin-3-yl)phenyl]imidazo[1,2-α]pyridine-7-carboxaldehyde (100 mg, 0.33 mmol) in tetrahydrofuran (10 ml) was cooled to −78° C. before adding methylmagnesium bromide (1.3 ml of 0.3M solution in diethyl ether) dropwise over 10 min. Once addition was complete the reaction was allowed to warm to ambient temperature and stirring continued for 16 h. Methanol (1 ml) was added and the mixture partitioned between ethyl acetate and 10% ammonium chloride solution. The organic layer was washed with brine, dried over sodium sulphate and concentrated to give a yellow oil. This oil was purified by preparative thin layer chromatography eluting with dichloromethane/methanol/conc. ammonia (95:5:0.5) to afford the title compound (59 mg, 57%) as a white foam. 1H NMR (360 MHz, CDCl3) δH 1.55 (3H, d, J 6), 4.97 (1H, q, J 6), 6.91 (1H, dd, J 2 and 7) 7.37-7.43 (1H, m), 7.56-7.67 (4H, m), 7.65-7.74 (2H, m), 7.89-7.94 (1H, m), 8.33 (1H, d, J 7), 8.60-8.65 (1H, m), 8.89 (1H, s); m/z (ES+) 316 (M++H).

1. additionOnce addition
2. customthe mixture partitioned between ethyl acetate and 10% ammonium chloride solution
3. washThe organic layer was washed with brine
4. dry with materialdried over sodium sulphate
5. concentrationconcentrated
6. customto give a yellow oil
7. customThis oil was purified by preparative thin layer chromatography
8. washeluting with dichloromethane/methanol/conc