Dehydrooligopeptides. V. Synthesis of N-carboxy .ALPHA.-dehydroamino acid anhydrides and their transformation to .ALPHA.-dehydroamino acid and dehydrooligopeptide derivatives.

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Abstract
The synthesis of N-carboxy .alpha.-dehydroamino acid anhydrides (.DELTA.NCA) from benzyloxycarbonyl-.alpha.-dehydroamino acids and the subsequent conversion of these products into new .alpha.-dehydroamino acid and dehydrooligopeptide derivatives are described. The new .DELTA.NCA derivatives are very useful synthons for dehydropeptides. The racemization behavior and configurational determination of all the new dehydrooligopeptides thus obtained are discussed. [.alpha.-Dehydroamino acid residues are important constituents or moieties of antibacterial, antibiotic and phytotoxic dehydropeptides.].