Реакция #55366

Уравнение реакции

phosgene

1-propionylpiperazine

→

1-Chlorocarbonyl-4-propionylpiperazine

Выход 98.8%

Растворители

toluene

toluene

Условия реакции

Методика

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.

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