Reaction #2348084

Reaction equation

4-propyl phenylboronic acid

1-bromo-3-fluorobenzene

potassium carbonate

→

3-fluoro-4′-propylbiphenyl

Yield 80.6%

Solvents

toluene

toluene

water

Conditions

Workup

1. 1
   Temperatureheated
2. 2
   Temperatureunder reflux for 2 hours
3. 3
   workup.ADDITIONmixed
4. 4
   Otherto be separated into two layers of an organic layer
5. 5
   ExtractionExtraction into an organic layer
6. 6
   WashThe extracts were washed with water
7. 7
   Dryingdried over anhydrous magnesium sulfate
8. 8
   ConcentrationThe resulting solution was concentrated under reduced pressure
9. 9
   Otherthe residue was purified by means
10. 10
    Otherof fraction-collecting column chromatography
11. 11
    OtherThe solution was further purified by recrystallization from Solmix A-11
12. 12
    Otherdried

Procedure

Into a reaction vessel under an atmosphere of nitrogen, 4-propyl phenylboronic acid (T16; 200.0 g), 1-bromo-3-fluorobenzene (T8; 177.8 g), potassium carbonate (281.9 g), Pd(Ph3P)2Cl2 (7.2 g), toluene (600 ml), and Solmix A-11 (600 ml) were put and heated under reflux for 2 hours. After the reaction mixture had been cooled to 25° C., the solution was poured into water (2,000 ml) and toluene (1,000 ml), and mixed. The mixture was then allowed to stand to be separated into two layers of an organic layer and an aqueous layer. Extraction into an organic layer was carried out and the resulting organic layer was fractionated. The extracts were washed with water, and dried over anhydrous magnesium sulfate. The resulting solution was concentrated under reduced pressure, and the residue was purified by means of fraction-collecting column chromatography using heptane as the eluent and silica gel as the stationary phase powder. The solution was further purified by recrystallization from Solmix A-11 and then dried, whereby 175.5 g of 3-fluoro-4′-propylbiphenyl (T17) was obtained. The yield based on the compound (T8) was 80.3%.

Source