Pincer ligands based on alpha-amino acids: IV. Schiff bases derived from pyridine-2,6-dicarbaldehyde. Synthesis and intramolecular dynamicsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A number of pincer Schiff base and amine ligands were synthesized from pyridine-2,6-dicarbaldehyde and alpha-amino acids, L-methionine and L-serine. The Schiff base derived from L-serine was shown to exist as an equilibrium mixture with diastereoisomeric oxazolidines. The ring-chain tautomerism was confirmed by the results of reduction of the azomethine bond. The reduction products, pincer amines, exist in solution as mixtures of conformers differing in the degree of aggregation of the amino acid residues.