The formation of a carbon–carbon double bond is one of the useful and fundamental reactions in synthetic organic chemistry, particularly in the synthesis of complex natural products with biological activity. α,β-Unsaturated amides have been used as building blocks in organic synthesis [ 1-3 View all references ] to prepare natural products. [ 4 4. Takai , K. ; Tezuka , M. ; Utimoto , K. Stereoselective synthesis of trisubstituted α,β-unsaturated esters and amides via reactions of tantalum- ...