反应详情

温度

-60 °C

25 ml of a solution of 1.1M of diisobutylaluminum hydride in toluene was added at -60° C. over 90 minutes to a solution of 5 g of 1,8,8-trimethyl-2-oxa-bicyclo [3,2,1] octane-3-one [process of Ronald et al, J.A.C.S., Vol. 81 (1959), p. 925] in 20 ml of toluene and the mixture was stirred for 2 hours at -60° C. Water was added dropwise while the temperature was allowed to rise to 20° C. and the mixture was then stirred at 20° C. for 2 hours. The mixture was filtered to remove lithium salts and the filter was washed with methylene chloride. The decanted aqueous phase of the filtrate was extracted with methylene chloride. The organic phase was dried and evaporated to dryness and the residue was chromatographed over silica gel. Elution with a 1--1 benzene-ethyl acetate mixture yielded 3.5 g of 1,8,8-trimethyl-2-oxa-bicyclo [3,2,1] octan-3-ol.

1. customto rise to 20° C.
2. stirringthe mixture was then stirred at 20° C. for 2 hours
3. filtrationThe mixture was filtered
4. customto remove lithium salts
5. washthe filter was washed with methylene chloride
6. extractionThe decanted aqueous phase of the filtrate was extracted with methylene chloride
7. customThe organic phase was dried
8. customevaporated to dryness
9. customthe residue was chromatographed over silica gel
10. washElution with a 1--1 benzene-ethyl acetate mixture