Реакция #1994254

Уравнение реакции

CuCN

butadiene monooxide

phenyl magnesium bromide

phenylmagnesium bromide

→

trans-4-phenyl-2-butene-1-ol

Растворители

tetrahydrofuran

ether

ether

Условия реакции

Обработка

1. 1
   ДругоеThe resulting reaction mixture
2. 2
   Температураto warm to 0° C.
3. 3
   workup.STIRRINGto stir until the reaction mixture
4. 4
   workup.WAITAfter this period
5. 5
   Температураthe reaction mixture was cooled to −78° C.
6. 6
   Температураto warm to 23° C. for 1 h
7. 7
   ДругоеThe reaction was quenched by slow addition of saturated aqueous NH4Cl (120 mL)
8. 8
   ЭкстракцияThe aqueous layer was thoroughly extracted with ethyl acetate (2×300 mL)
9. 9
   СушкаThe combined organic layers were dried over anhydrous Na2SO4
10. 10
    Фильтрацияfiltered
11. 11
    Концентрированиеconcentrated under reduced pressure
12. 12
    workup.DISTILLATIONThe residue was distilled under vacuum (0.12 torr) at 95° C.

Методика

Anhydrous CuCN (4.86 g, 54 mmol) was added to a solution of butadiene monooxide (38 g, 540 mmol) in anhydrous tetrahydrofuran (1.2 L) and the resulting mixture was stirred at −78° C. Commercial phenyl magnesium bromide solution (Aldrich) in ether (65 mmol) was added dropwise over a period of 10 min. The resulting reaction mixture was then allowed to warm to 0° C. and it was continued to stir until the reaction mixture was homogeneous. After this period, the reaction mixture was cooled to −78° C. and 0.58 mole of phenylmagnesium bromide solution in ether was added dropwise for 30 min. The reaction mixture was allowed to warm to 23° C. for 1 h. The reaction was quenched by slow addition of saturated aqueous NH4Cl (120 mL) followed by NH4OH (70 mL), saturated NH4Cl (500 mL) and then H2O (300 mL). The aqueous layer was thoroughly extracted with ethyl acetate (2×300 mL). The combined organic layers were dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was distilled under vacuum (0.12 torr) at 95° C. to give trans-4-phenyl-2-butene-1-ol (75.6 g).

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