Conjugates of Bispidine and Monoterpenoids as Ligands of Metal Complex Catalysts for the Henry Reaction

A number of chiral chelating conjugates combining a bispidine central backbone and one or two pinene side fragments were synthesized. It was shown for the first time that the synthesized compounds are capable to act as catalysts in the Henry reaction both individually and in the presence of metal salts. It was found that the best catalytic results were shown for bis-tertiary amine combining bispidinone and two (–)-myrtenol fragments, and copper as well as zinc acetates.