反応 #81138

反応方程式

alcohol

tert-butyl (2RS, 3RS)-2-(3,4-dichlorobenzyl)-3-hydroxybutanoate

lithium borohydride

→

(2RS, 3RS)-2-(3,4-dichlorobenzyl)-1,3-butanediol

収率 90.0%

溶媒

ethyl ether

tetrahydrofuran

ethyl ether

反応条件

後処理

1. 1
   workup.ADDITIONwas added
2. 2
   温度under cooling with ice
3. 3
   workup.STIRRINGThe mixture was stirred at room temperature for 3 hours
4. 4
   洗浄washed with a saturated sodium chloride aqueous solution
5. 5
   乾燥dried over anhydrous magnesium sulfate
6. 6
   その他The drying agent was separated by filtration
7. 7
   workup.DISTILLATIONthe solvent was distilled off under reduced pressure

実験手順

3.0 g of the alcohol compound thus obtained was dissolved in a liquid mixture of 30 ml of ethyl ether and 30 ml of tetrahydrofuran, and 1.2 g of lithium borohydride was added thereto with stirring under cooling with ice. The mixture was stirred at room temperature for 3 hours. The reaction solution was diluted with ethyl ether, then washed with a saturated sodium chloride aqueous solution and dried over anhydrous magnesium sulfate. The drying agent was separated by filtration, and then the solvent was distilled off under reduced pressure. The residue was subjected to silica gel column chromatography (hexane/ethyl acetate=10/1) to obtain 2.1 g (yield: 90%) of (2RS, 3RS)-2-(3,4-dichlorobenzyl)-1,3-butanediol.

出典