Add time:07/15/2019         Source:sciencedirect.com

A new category of bis- and tris-amides was synthesized using succinic acid, succinic anhydride and maleic anhydride in the Ugi reaction. It provides a simple approach for the synthesis of novel Ugi adducts with additional functional groups such as carboxylic acid, carboxamide and α,β-unsaturated amide. In addition, post-condensation cyclization of Ugi adducts with maleic anhydride was performed in the presence of NaH to form functionalized piperazine 2,5-diones via intramolecular Michael addition reaction.

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