Rhodium-Catalyzed NH Insertion of Pyridyl Carbenes Derived from Pyridotriazoles: A General and Efficient Approach to 2-Picolylamines and Imidazo[1,5-<i>a</i>]pyridines
作者:Yi Shi、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/anie.201408335
日期:2014.12.15
A general and efficientNHinsertion reaction of rhodium pyridylcarbenesderivedfrompyridotriazoles was developed. Various NH‐containing compounds, including amides, anilines, enamines, and aliphatic amines, smoothly underwent the NHinsertion reaction to afford 2‐picolylamine derivatives. The developed transformation was further utilized in a facile one‐pot synthesis of imidazo[1,5‐a]pyridines.
Amide and lactam frameworks were synthesized via an efficient two-step strategy. In this protocol, pyridotriazoles were first treated with isocyanates to form the corresponding amides, which were found to be sufficiently reactive to undergo subsequent intramolecular N–H insertion in the absence of any additional reagents or catalysts.
Synthesis and structural characterization of arene d6 metal complexes of sulfonohydrazone and triazolo ligands: High potency of triazolo derivatives towards DNA binding
Complexation of [(p-cymene)RuCl2](2) and [Cp*MCl2](2) (M = Rh/lr) with chelating ligand 4-methylbenzenesulfonohydrazone ligands (L1 and L3) resulted in the formation of mononuclear cationic complexes having PF6 as the counter ion whereas, complexation with the triazolo pyridine based ligand (L2) resulted in neutral complexes with mono-dentate binding fashion to the metal center. All these complexes were fully characterized by analytical, spectroscopic and X-ray diffraction studies. The complexes showed typical piano stool geometry around the metal center with the ligands acting as NN' donor chelating ligand (for L1 and L3) and mono-dentate ligand (for L2). Biological studies such as antibacterial and DNA binding studies were screened for the ligands as well as for the complexes. The complexes as well as ligands have not indicated any antibacterial activity but the triazolo ligand (L2) as well as complex 4 and complex 6 exhibited DNA binding activity. (C) 2018 Elsevier Ltd. All rights reserved.