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Chiral (Z)-α,β-didehydroamino acid (DDAA) derivatives 14, 15 and 16 are obtained from a new chiral iminic cyclic glycine template with 1,2,3,6-tetrahydropyrazin-2-one structure 10 by condensation with carbonyl compounds, Eschenmoser's salt and Bredereck's reagent, respectively. The didehydroalanine derivative 15 and the enaminone 16 can give DDAA derivatives 14 using Heck olefination and vinylic nucleophilic...
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