反応 #511796

反応方程式

Diisobutylaluminium hydride

1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester

→

1,4-Dioxa-spiro[4.5]decane-8-carbaldehyde

溶媒

toluene

反応条件

後処理

1. 1
   その他The mixture was then quenched at −70 to −60° C. by addition of methanol (80 ml)
2. 2
   workup.ADDITIONsaturated sodium chloride solution (100 ml) was added
3. 3
   ろ過the reaction solution was filtered out with suction over kieselguhr
4. 4
   洗浄The kieselguhr was washed twice with ethyl acetate
5. 5
   その他the aqueous solution was separated off
6. 6
   抽出extracted twice with ethyl acetate
7. 7
   洗浄The combined organic extracts were washed with saturated sodium chloride solution
8. 8
   乾燥dried over sodium sulfate
9. 9
   濃縮concentrated i

実験手順

Diisobutylaluminium hydride (1.5 M solution in toluene, 102 ml, 153 mmol) was added dropwise to a solution of 1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester (32.13 g, 150 mmol) in absol. toluene (160 ml) at −70 to −65° C. under argon and the mixture was stirred for 30 min. The mixture was then quenched at −70 to −60° C. by addition of methanol (80 ml). The reaction solution was warmed to RT, saturated sodium chloride solution (100 ml) was added and the reaction solution was filtered out with suction over kieselguhr. The kieselguhr was washed twice with ethyl acetate and the aqueous solution was separated off and extracted twice with ethyl acetate. The combined organic extracts were washed with saturated sodium chloride solution, dried over sodium sulfate and concentrated i. vac. Yield: 24.01 g (94%), yellow oil

出典