反应详情

2.50 ml of 2.5 M n-butylithium hexane solution was added dropwise to a tetrahydrofuran solution comprising 4 ml THF and 1.00 ml diisopropylamine at −78° C. and the mixture was stirred for 15 minutes. Then, a solution comprising 4 ml THF with 0.91 g camphor dissolved therein was added dropwise to the above solution at −78° C., then, 0.27 g of acetaldehyde was further added and the mixture was stirred for 15 minutes. Thus, 3-(1-Hydroxyethyl)-camphor was synthesized. This reaction solution was admixed with 50 ml of saturated sodium hydrogen carbonate aqueous solution and restored to room temperature. The reaction product was extracted with diethylether. 5 ml of the above 3-(1-hydroxyethyl)-camphor diethylether solution was gradually added dropwise to 10 ml of a diethylether solution comprising 10 ml diethylether and 0.11 g lithium aluminum hydride and the mixture was stirred at room temperature for 30 minutes. 0.5 ml of water and 0.5 ml of 2N-NaOH were added to the reaction solution to separate the solids out. The separated-out solids were filtered off and the solvent was removed under vacuum. The residue was purified by means of silica gel column chromatography (eluent: hexane/ethylacetate=7/3) and 0.75 g of 3-(1-hydroxyethyl)-borneol was obtained (yield: 95%).

1. customat −78° C.
2. dissolutiondissolved
3. additiontherein was added dropwise to the above solution at −78° C.
4. stirringthe mixture was stirred for 15 minutes
5. customrestored to room temperature
6. extractionThe reaction product was extracted with diethylether
7. addition5 ml of the above 3-(1-hydroxyethyl)-camphor diethylether solution was gradually added dropwise to 10 ml of a diethylether solution
8. stirringthe mixture was stirred at room temperature for 30 minutes
9. addition0.5 ml of water and 0.5 ml of 2N-NaOH were added to the reaction solution
10. customto separate the solids out
11. filtrationThe separated-out solids were filtered off
12. customthe solvent was removed under vacuum
13. customThe residue was purified by means of silica gel column chromatography (eluent: hexane/ethylacetate=7/3)