A method for transesterification of the ester groups in dialkylaziridine dicarboxylates by electrophilic activation of the carbonyl group in the presence of magnesium acetate with the preservation of the aziridine ring was developed and the use of modified aziridine dicarboxylates in the synthesis of sterically hindered derivatives of fullerenes C-60, 2',5'-disubstituted fulleropyrrolidines, was demonstrated.