3-Methylglutaric anhydride → (3RS)-3-methyl-5-oxo-5-[4-(2-oxo-2-pyrrolidin-1-ylethyl)piperazin-1-yl]pentanoic acid

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Reaction Steps

1.6 g of 3-methylglutaric anhydride and then 2.62 g of pyrrolidinocarbonylmethyl-piperazine are added to 10 cm3 of dioxane. After stirring for 8 hours, an additional 320 mg of 3-methylglutaric anhydride are added and then the stirring is continued at 20° C. for 18 hours. The solvent is then evaporated under reduced pressure and then the resulting oil is dried at 45° C. (90 Pa) to give 4.5 g of (3RS)-3-methyl-5-oxo-5-[4-(2-oxo-2-pyrrolidin-1-ylethyl)piperazin-1-yl]pentanoic acid in the form of an orange-colored oil which is used as it is.

Provenance & Evidence