Bulky alkylaminophenol chelates with high potential for functionalization - 17/09/18
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Abstract |
Aminophenols are an important class of N,O-ligands, particularly for the coordination of first-row transition metals. While their structural and electronic character and the additional possibility of bioactivation are well appreciated in coordination chemistry, particularly of responsive systems, the synthesis of the more branched and structurally demanding models is still a challenge. Therefore, the synthesis of bulky bis(hydroxybenzyl)-N’-(aminopyridyl)propanamines is described here. It consists of the Mannich reaction of 2,4-disubstituted phenols with 3-aminopropan-1-ol and paraformaldehyde to N,N-bis(2-hydroxybenzyl)-3-aminopropan-1-ol. Substitution of the hydroxyl group with chlorine followed by amination with 2-(aminomethyl)pyridine results in bulky pentadentate N,O-ligands with a free site on the nitrogen atom for further functionalization. The method features good yields and high selectivity, and the products are well identified by spectroscopic methods.
Le texte complet de cet article est disponible en PDF.Graphical abstract |
Highlights |
• | Bulky alkylaminophenol chelates could be selectively obtained from phenols. |
• | H-bonding hampers dealkylation via cyclic ammonium salts. |
• | The chelates feature with high affinity to d-block metals. |
• | There is free nitrogen site for functionalization and bioresponsive character. |
• | Bulky substituents protect from the intermolecular interaction of the metal center. |
Keywords : N,O-ligands, Aliphatic amines, Phenol, Mannich reaction
Plan
Vol 21 - N° 9
P. 831-834 - septembre 2018 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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