Smart ammonium ferrates [TBA][FeXIst3Y] as catalyst for the transformation of aziridines and CO2 into 5-substituted 1,3-oxazolidine-2-ones under mild reaction conditions (room temperature and atmospheric pressure) are reported.
Herein we report a new straightforward synthesis of cis and trans 2,5-disubstituted N,N-dialkylpiperazines, even in enantioenriched form, by reacting non-activated N-alkyl arylaziridines in the presence of a catalytic amount of a Lewis acid. A stereochemical and NMR investigation revealed useful mechanistic insights for this process.