反应详情

To a stirred mixture of pivaloyl chloride (6.02 g, 0.05 m) and copper (I) iodide (0.10 g, 0.6 mm) in dry ether (50 mls) at -60° C. under nitrogen was added dropwise isoamyl magnesium bromide [prepared from magnesium turnings (1.8 g, 0.075 m) and isoamyl bromide (7.55 g, 0.05 m) in dry ether (70 mls]. The cooling bath was removed and the reaction mixture stirred for 16 hours then poured cautiously into ice-cold dilute hydrochloric acid and extracted with ether. The combined ethereal extracts were washed with saturated aqueous sodium hydrogen carbonate solution, brine, dried (anhydrous MgSO4) and evaporated. The residue was chromatographed on silica using gradient elution (dichloromethane (0-30%) in petrol) to give the ketone as a pale yellow oil.

1. customThe cooling bath was removed
2. additionthen poured cautiously into ice-cold dilute hydrochloric acid
3. extractionextracted with ether
4. washThe combined ethereal extracts were washed with saturated aqueous sodium hydrogen carbonate solution, brine
5. dry with materialdried (anhydrous MgSO4)
6. customevaporated
7. customThe residue was chromatographed on silica using gradient elution (dichloromethane (0-30%) in petrol)