反应详情

A dry 250 ml B 3-neck flask was fitted with a gas inlet tube extending nearly to the bottom of the flask and was charged with 9.81 ml of 3-bromopyridine, 11.8 g of 5-hexyn-1-ol, 40 ml of distilled triethylamine and 60 ml of dichloromethane. The mixture was degassed with argon for 15 minutes and 0.70 g of bis(triphenylphosphine)palladium dichloride and 0.13 g of cuprous iodide were added. The flask was evacuated and filled three times with argon and the reaction was heated to reflux for 2 hours. The cooled mixture was diluted with dichloromethane and was washed with water and brine, dried (potassium carbonate) and concentrated to 20 g of a dark red oil which was used directly in the next step. A portion was chromatographed over 70 g of silica gel eluting with 1:1 ethyl acetate-hexane containing 1% triethylamine to yield a colorless oil which was evaporatively distilled, bp 145°-150° C./0.1 mm to give an analytical sample of 6-(3-pyridinyl)-5-hexyn-1-ol.

1. customA dry 250 ml B 3-neck flask was fitted with a gas inlet tube
2. customThe mixture was degassed with argon for 15 minutes
3. addition0.70 g of bis(triphenylphosphine)palladium dichloride and 0.13 g of cuprous iodide were added
4. customThe flask was evacuated
5. additionfilled three times with argon
6. temperaturethe reaction was heated
7. temperatureto reflux for 2 hours
8. additionThe cooled mixture was diluted with dichloromethane
9. washwas washed with water and brine
10. dry with materialdried (potassium carbonate)
11. concentrationconcentrated to 20 g of a dark red oil which
12. customA portion was chromatographed over 70 g of silica gel eluting with 1:1 ethyl acetate-hexane containing 1% triethylamine
13. customto yield a colorless oil which
14. distillationwas evaporatively distilled