反応 #790946

反応方程式

lithium aluminum hydride

tetrahydrofuran

methyl 4-tetrahydropyranyloxybenzoate

→

4-tetrahydropyranyloxybenzyl alcohol

収率 71.1%

溶媒

water

反応条件

後処理

1. 1
   その他did not exceed 30° C
2. 2
   ろ過The mixture was filtered
3. 3
   workup.STIRRINGthe filtrate was stirred with 200 mL of aqueous sodium hydroxide for 2 hr
4. 4
   その他The organic layer was separated
5. 5
   その他evaporated with a rotary evaporator
6. 6
   workup.DISSOLUTIONThe residue was dissolved in 200 mL of ether
7. 7
   洗浄washed three times with 5% aqueous sodium bicarbonate
8. 8
   乾燥dried over sodium sulfate
9. 9
   その他Evaporation

実験手順

To a mechanically stirred slurry of 10 g of lithium aluminum hydride and 100 mL of tetrahydrofuran was added dropwise with cooling in an ice bath a solution of 32.9 g (0.139 mol) of methyl 4-tetrahydropyranyloxybenzoate at a rate such that the temperature did not exceed 30° C. After stirring 18 hr at room temperature, the solution was treated cautiously with 100 mL of water. The mixture was filtered, and the filtrate was stirred with 200 mL of aqueous sodium hydroxide for 2 hr. The organic layer was separated and evaporated with a rotary evaporator. The residue was dissolved in 200 mL of ether and washed three times with 5% aqueous sodium bicarbonate and dried over sodium sulfate. Evaporation gave 20.58 g of 4-tetrahydropyranyloxybenzyl alcohol as a liquid. 1H NMR (360 MHz, THF-d8): 1.45-2.0 (m's, 6H, CH2), 3.5 (m, 1H, OCH2), 3.8 (m, 1H, OCH2 ), 4.25 (t, J=6, 1H, OH), 4.45 (d, J=6, 2H, ArCH2OH), 5.35 (t, J=3, 1H, OCHO), 6.95 (d, J=8, 2H, ArH), 7.19 (d, J=8, 2H, ArH).

出典