Реакция #6615

Уравнение реакции

epoxide

2-(4-fluoro-3-methylphenyl)-4,4,6,6-tetramethyl-1-epoxycyclohexane

→

2-(4-fluoro-3-methylphenyl)-4,4,6,6-tetramethylcyclohexanone

Выход 80.0%

Растворители

ether

benzene

Условия реакции

Обработка

1. 1
   ДругоеThe cooling bath is removed
2. 2
   ДругоеThe benzene is removed under reduced pressure
3. 3
   Другоеprovides a residue which
4. 4
   Промывкаwashed with saturated ammonium chloride
5. 5
   КонцентрированиеThe ether layer is concentrated under reduced pressure

Методика

To a cooled solution (0° C.) of the epoxide from Example 1, Step A above (32.7 g, 125 mmol) in benzene (200 ml) is added dropwise 7.6 ml BF3 ·OEt2 (62 mmol). The cooling bath is removed and the reaction mixture warmed to room temperature and stirred for 2 hours. The benzene is removed under reduced pressure and provides a residue which is dissolved in ether (300 ml) and washed with saturated ammonium chloride. The ether layer is concentrated under reduced pressure to provide 26 g (80%) of 2-(4-fluoro-3-methylphenyl)-4,4,6,6-tetramethylcyclohexanone. The ketone is recrystallized from pentane to give a white solid; m.p. 63°-64° C.: 1H NMR δ=1.05 (s,3), 1.1 (s,3), 1.3 (s,3), 1.32 (s,3), 1.75 (s,2), 2.0 (q,2), 2.3 (s,3), 3.95 (dd,1), 6.95 (m,3).

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