Réaction #55366

Équation de réaction

phosgene

1-propionylpiperazine

→

1-Chlorocarbonyl-4-propionylpiperazine

Rendement 98.8%

Solvants

toluene

toluene

Conditions de réaction

Mode opératoire

A solution of phosgene (45.0 g.) in anhydrous toluene (500 cm3) and 1-propionylpiperazine (129.0 g.) are added simultaneously to anhydrous toluene (500 cm3), while the temperature is maintained at about -5° C. 1-Chlorocarbonyl-4-propionylpiperazine (92.0 g.), m.p. about 45° C., is thus obtained. After one hour's stirring at 2° C., the 1-propionylpiperazine hydrochloride formed is separated by filtration and, after evaporation of the filtrate under reduced pressure (20 mm.Hg) 1-chlorocarbonyl-4-propionyl-piperazine is obtained.

Source