In the pyroglutamicacid series, β-enaminoesters 3 were formed in the 2-position by opening of the corresponding Meldrum's derivative 6, and β-enaminonitriles 4 were obtained by treating carbamate vinylogous 5 by trimethytsilyl iodide. Alkylation and acylation of β-enaminoester 3a was briefly examined.