反应详情

温度

105 °C

(6-Methylpyridin-3-yl)methanol (3.25 g, 26.4 mmol), 2-chloro-4-iodopyridine (5.7 g, 24 mmol), cesium carbonate (10.1 g, 31.2 mmol), CuI (0.90 g, 4.8 mmol) and 1,10-phenanthroline (0.86 g, 4.8 mmol) were stirred in toluene (15 mL) and degassed with a nitrogen stream for 10 minutes. The mixture was heated to 105° C. for 16 h, allowed cool and filtered through a silica plug eluting with ethyl acetate. The filtrate was concentrated, and the residue was purified by column chromatography (80 g ISCO column eluting with ethyl acetate/hexanes; gradient 100% hexanes to 100% ethyl acetate) to provide the title compound (4.2 g, 75%) as a white solid: 1H NMR (300 MHz, CDCl3) δ 8.54 (d, J=2.0 Hz, 1H), 8.21 (d, J=5.7 Hz, 1H), 7.65-7.62 (dd, J=7.9, 2.2 Hz, 1H), 7.21 (d, J=7.9 Hz, 1H), 6.91 (d, J=2.2 Hz, 1H), 6.83-6.80 (dd, J=5.8, 2.2 Hz, 1H), 5.08 (s, 2H), 2.59 (s, 3H).

1. customdegassed with a nitrogen stream for 10 minutes
2. temperatureallowed cool
3. filtrationfiltered through a silica plug
4. washeluting with ethyl acetate
5. concentrationThe filtrate was concentrated
6. customthe residue was purified by column chromatography (80 g ISCO column eluting with ethyl acetate/hexanes; gradient 100% hexanes to 100% ethyl acetate)