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Treatment of alpha-bromoacyl amides of esters of N-protected alpha-amino acids with lithium telluride yields an amide enolate which cyclizes to unstable tetramic acids (2, 4-pyrrolidinediones) which can be converted to stable derivatives (e.g. enol esters, silyl enol ethers, enol tosylates). Reaction conditions are modified to reduce unwanted side reactions: protonation of the enolate, self-catalyzed intermolecular aldol rections of the tetramic acids, and potential racemization at the alpha-carbon atom of the amino acid.

Tetramic acids and derivatives by telluride-triggered Dieckmann cyclizations