Реакция #6684

Уравнение реакции

4-bromobutan-1-ol

3,4-dihydropyran

potassium carbonate

→

2-(4-bromobutoxy) -tetrahydropyran

2-(4-Bromobutoxy)tetrahydropyran

Растворители

dichloromethane

phosphorus oxychloride

Условия реакции

Обработка

1. 1
   workup.STIRRINGthe reaction mixture was stirred at room temperature for 1 h
2. 2
   Другоеquenched with water
3. 3
   Экстракцияextracted with dichloromethane
4. 4
   Промывкаwashed with brine
5. 5
   Сушкаdried over MgSO4
6. 6
   Концентрированиеconcentrated in vacuo
7. 7
   ДругоеPurification by chromatography on silica gel (5% EtOAc (ethylacetate)/hexanes)

Методика

To a solution of commercially available 4-bromobutan-1-ol (16) (1 equi.) and 3,4-dihydropyran (17) (1.5 equi.) in dichloromethane (3 mL/mmole), phosphorus oxychloride (0.01 equi.) was added at room temperature. The reaction mixture was stirred at that temperature for 24 h. Then potassium carbonate (1 equi.) was added to the reaction mixture and the reaction mixture was stirred at room temperature for 1 h, quenched with water, extracted with dichloromethane, washed with brine, dried over MgSO4, and concentrated in vacuo. Purification by chromatography on silica gel (5% EtOAc (ethylacetate)/hexanes) afforded 2-(4-bromobutoxy) -tetrahydropyran (18), as a colorless oil (88%).

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