P. Cauliez et al., STUDIES ON PYRROLIDINONES - SYNTHESIS OF 2-(5-OXO-2-PYRROLIDINYL)-1,3,4-OXADIAZOLES AND 2-(5-OXO-2-PYRROLIDINYL)BENZIMIDAZOLES, Journal of heterocyclic chemistry, 30(4), 1993, pp. 921-927
The condensation of pyroglutamic acids with 1,2-phenylenediamine leads
to 2-(5-oxo-2-pyrrolidinyl)benzimidazoles and the cyclization of disi
lylated diacylhydrazines derived from the same acids gives 2-(5-oxo-2-
pyrrolidinyl)-1,3,4-oxadiazoles. These compounds show weak antifungal
activity.