Glutaric anhydride → 4-Ethyl-δ-oxo-1-piperazinepentanoic acid

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Reaction Steps

1.5 g of 1-ethylpiperazine and 1.5 g of glutaric anhydride in solution in 5 cm3 of dioxane are added, under argon, to 10 cm3 of dioxane. The stirring is continued at 25° C. for 19 hours. The solvents are evaporated under reduced pressure (2.7 kPa) to give a brown oil which is stirred in ethyl ether. The solid obtained is filtered, rinsed with diethyl ether and then dried at 20° C. (90 Pa) to give 1.95 g of 5-(4-ethylpiperazin-1-yl)-5-oxopentanoic acid in the form of a hygroscopic pink solid which is used as it is.

Provenance & Evidence