反应详情

Sodium hydride (1.35 g of 80% in mineral oil, 45.0 mmol) was added to a stirred solution of phenol (4.26 g, 45.3 mmol) in DMF (30 mL) at 0° C., under nitrogen. The mixture was stirred at room temperature for 3 h, treated with 3,5-dibromopyridine (4.0 g, 16.9 mmol) and heated at 100° C. for 48 h. The reaction mixture was cooled to room temperature, poured into a mixture of water (100 mL) and 5M sodium hydroxide (10 mL), and extracted with ether (3×60 mL). The combined ether extracts were dried (Na2SO4), filtered, and rotary evaporated to a pale yellow semi-solid (4.9 g). This was chromatographed on a silica gel (200 g) column with hexane/ethyl acetate/chloroform (8:1:1, v/v) as eluant to give 2.86 g (68% yield) of a colorless oil.

1. temperatureheated at 100° C. for 48 h
2. temperatureThe reaction mixture was cooled to room temperature
3. extractionextracted with ether (3×60 mL)
4. dry with materialThe combined ether extracts were dried (Na2SO4)
5. filtrationfiltered
6. customrotary evaporated to a pale yellow semi-solid (4.9 g)
7. customThis was chromatographed on a silica gel (200 g) column with hexane/ethyl acetate/chloroform (8:1:1