反应详情

温度

105 °C

(3,5-Dichloropyridin-2-yl)methanol (2.00 g, 10.4 mmol), 2-chloro-4-iodopyridine (2.49 g, 10.4 mmol), cesium carbonate (4.41 g, 13.5 mmol), CuI (1.97 g, 10.4 mmol) and 1,10-phenanthroline (374 mg, 2.08 mmol) were stirred in toluene (20 mL) and degassed with a nitrogen stream for 10 minutes. The mixture was heated to 105° C. for 16 h, allowed to cool and filtered through a silica plug eluting with ethyl acetate. The filtrate was concentrated, and the resulting residue was purified by column chromatography (80 g ISCO column column eluting with ethyl acetate/hexanes; gradient 100% hexanes to 40% ethyl acetate) to provide the title compound (1.15 g, 38%) as an orange solid: 1H NMR (300 MHz, CDCl3) δ 8.50 (d, J=2.1 Hz, 1H), 8.21 (d, J=5.8 Hz, 1H), 7.80 (d, J=2.1 Hz, 1H), 6.97 (d, J=2.2 Hz, 1H), 6.88-6.85 (dd, J=5.8, 2.2 Hz, 1H), 5.31 (s, 2H).

1. customdegassed with a nitrogen stream for 10 minutes
2. temperatureto cool
3. filtrationfiltered through a silica plug
4. washeluting with ethyl acetate
5. concentrationThe filtrate was concentrated
6. customthe resulting residue was purified by column chromatography (80 g ISCO column column eluting with ethyl acetate/hexanes; gradient 100% hexanes to 40% ethyl acetate)