Реакция #64051

Уравнение реакции

2-butyryl-3-hydroxy-5-mesitylcyclohex-2-en-1-one

dichloromethyl methyl ether

→

2-butyryl-3-hydroxy-5-(3-formyl-2,4,6-trimethylphenyl)cyclohex-2-en-1-one

Выход 26.7%

Растворители

dichloroethane

dichloroethane

Условия реакции

Обработка

1. 1
   workup.ADDITIONwas added dropwise over a 25 minute period
2. 2
   workup.ADDITIONAfter the addition
3. 3
   workup.STIRRINGthe mixture was stirred for 5 minutes at 0° C., for 30 minutes at room temperature and for 2 hours
4. 4
   Температураunder reflux
5. 5
   ДругоеThe cooled reaction mixture
6. 6
   workup.ADDITIONwas poured into a separatory funnel
7. 7
   workup.ADDITIONcontaining
8. 8
   Другоеcrushed ice
9. 9
   workup.STIRRINGwas shaken thoroughly
10. 10
    ДругоеThe organic layer was separated
11. 11
    Экстракцияthe aqueous solution was extracted with methylene chloride
12. 12
    ПромывкаThe combined organic solution was washed with water
13. 13
    Сушкаdried over anhydrous sodium sulfate
14. 14
    Другоеevaporated to dryness
15. 15
    Другоеto give a crude brown oil (0.70 g)
16. 16
    ДругоеPurification by column chromatography over silica gel (eluant dichloromethane)

Методика

To a solution of 2-butyryl-3-hydroxy-5-mesitylcyclohex-2-en-1-one (1.20 g) in dichloroethane (20 ml) at 0° C. was added titanium tetrachloride (300 g) over a period of 3 minutes. While the solution was stirred and cooled dichloromethyl methyl ether (0.46 g) in dichloroethane(20 ml) was added dropwise over a 25 minute period. After the addition was complete, the mixture was stirred for 5 minutes at 0° C., for 30 minutes at room temperature and for 2 hours under reflux. The cooled reaction mixture was poured into a separatory funnel containing crushed ice and was shaken thoroughly. The organic layer was separated, and the aqueous solution was extracted with methylene chloride. The combined organic solution was washed with water, dried over anhydrous sodium sulfate and evaporated to dryness to give a crude brown oil (0.70 g). Purification by column chromatography over silica gel (eluant dichloromethane) gave 2-butyryl-3-hydroxy-5-(3-formyl-2,4,6-trimethylphenyl)cyclohex-2-en-1-one (0.35 g) as a pale yellow oil. Proton nuclear magnetic resonance spectrum (CDCl3 ; δ in ppm): 1.0 (3H, t); 1.68 (2H, m); 2.43 (3H, s); 2.48 (3H, s); 2.61 (3H, s); 2.65-4.20 (7H, m); 6.94 (1H, s); 10.54 (1H, s); 18.33 (1H, s).

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