Réaction #5812

Équation de réaction

4-fluorobenzaldehyde

ethyl vinyl ketone

triethylamine

→

1-(4-fluorophenyl)-1,4-hexanedione

Rendement 89.5%

Solvants

diethylether

Conditions de réaction

Traitement

1. 1
   Lavagewashed with 2×300 mL of water, 2×100 mL of 2M hydrochloric acid, 100 mL of water, 200 mL of a saturated solution of sodium bicarbonate and brine
2. 2
   AutreThe organic layer is separated
3. 3
   Séchagedried (magnesium sulfate)
4. 4
   Filtrationfiltered
5. 5
   Concentrationconcentrated

Mode opératoire

A mixture of 36.61 g (295 mmol) of 4-fluorobenzaldehyde, 25 g (297.2 mmol) of ethyl vinyl ketone, 29 mL (206.9 mmol) of triethylamine and 11.94 g (44.25 mmol) of 3-benzyl-5-(2-hydroxyethyl)-4-methylthiazolium chloride is stirred and heated at 70° C. for six hours. The cooled solution is diluted with 2 liters of diethylether and washed with 2×300 mL of water, 2×100 mL of 2M hydrochloric acid, 100 mL of water, 200 mL of a saturated solution of sodium bicarbonate and brine. The organic layer is separated, dried (magnesium sulfate), filtered, and concentrated to provide 55 g of 1-(4-fluorophenyl)-1,4-hexanedione after recrystallization from methanol; mp 56°-57° C.

Source