تفاعل #324940

معادلة التفاعل

magnesium

magnesium

3,3-dimethyl-cyclohexanone

4-benzyloxybromobenzene

→

1-(4-benzyloxy-phenyl)-3,3-dimethyl-cyclohexanol

المردود 53.4%

المذيبات

THF

THF

THF

ظروف التفاعل

المعالجة

1. 1
   أخرىIn a RB flask (250 mL) was placed
2. 2
   workup.ADDITIONAfter addition
3. 3
   أخرىwas formed
4. 4
   درجة الحرارةThe reaction mixture was cooled in an ice-bath
5. 5
   أخرىThe solvent was removed under reduced pressure
6. 6
   أخرىThe residue was partitioned between EtOAc/aqueous NH4Cl
7. 7
   استخلاصThe aqueous phase was extracted three times with EtOAc
8. 8
   تجفيفdried (Na2SO4)

الإجراء التجريبي

In a RB flask (250 mL) was placed magnesium turnings (2.08 g, 85.9 mmol), which were stirred under vacuum without solvent overnight. To the stirred magnesium turnings was added anhydrous THF (10 mL). To the resulting mixture at 50° C. was added several drops of dibromoethane, followed by 4-benzyloxybromobenzene (11.8 g, 42.9 mmol) in 40 ml of THF. After addition was complete, the reaction mixture was heated at 60° C. for 3 hours until a brownish-grey slurry was formed. The reaction mixture was cooled in an ice-bath and 3,3-dimethyl-cyclohexanone (3.87 g, 30.67 mmol) in THF (15 mL) was added dropwise. The reaction mixture was stirred at room temperature for one hour. The solvent was removed under reduced pressure. The residue was partitioned between EtOAc/aqueous NH4Cl. The aqueous phase was extracted three times with EtOAc. The organic phase was combined and dried (Na2SO4). Silica gel chromatography (EtOAc/heptane) provided 5.08 g of 1-(4-benzyloxy-phenyl)-3,3-dimethyl-cyclohexanol as a white solid.

المصدر