53995-57-6

Upstream product

• 504-29-0 2-aminopyridine 
• 29745-44-6 pyridine-2-carbonyl chloride 
• 98-98-6 2-Picolinic acid 
• 1122-62-9 2-acetylpyridine 
• 1121-60-4 pyridine-2-carbaldehyde 
• 100446-36-4 1-nitro-2(-2-pyridyl)ethylene 
• 100-71-0 2-Ethylpyridine 
• 2524-52-9 ethyl-2-picolinate 

Downstream Products

• 82776-72-5 N-(Pyridine-2-carbonyl)-N-pyridin-2-yl-benzamide 
• 364041-97-4 dichlorobis-triphenylphosphine[2-(N-(2-pyridinium-2-yl)-carbamoyl-N(-))-pyridine]ruthenium(II) 

Relevant academic research and scientific papers

Synthesis, characterization and antibacterial activity of cobalt(III) complexes with pyridine-amide ligands

The ligands 2-(N-(X-pyridyl)carbamoyl)pyridine (X = 2, 3 or 4 for HL1-HL3, respectively) and 2,6-bis(N-(Y-pyridyl)carbamoyl)pyridine (Y = 2, 3 or 4 for H2L4-H2L6, respectively) in their mono- and di-deprotonated forms have been used to synthesize kinetically stable cobalt(III) compounds [Co(L1-3)3] (1-3) and Na[Co(L4-6)2] (4-6), respectively. The Co(III) ion is in octahedral environment and is surrounded by three bidentate ligands in complexes 1-3 and two tridentate ligands in complexes 4-6. Ligands coordinate the cobalt center via amidic-N and pyridine-N centers forming a 5-membered chelate ring. Complexes 1-6 have thoroughly been characterized by the various spectroscopic analyses (1H NMR, 13C NMR, UV-vis, IR, mass), elemental analysis, and conductivity measurement. All complexes have been assayed for in vitro antimicrobial activity against clinically isolated resistant strains of Pseudomonas, Proteus, Escherichia coli and standard strains of Pseudomonas aeruginosa (MTCC 1688), Shigella flexneri (MTCC 1457), Klebsiella planticola (MTCC 2272). All cobalt compounds show mild to moderate activity. However, complexes [Co(L1)3] (1) and Na[Co(L4)2] (4) were found to have potent activity against standard and pathogenic resistant bacteria used in the study. Their MIC ranged from 2.7 to 187 μg/ml. In vitro toxicity tests demonstrated that all complexes were less cytotoxic than that of gentamycin on HEK cell lines and the results reveal that these complexes can act as potent antimicrobial agents.

Theoretical rationalization of structure of transannular bonded germanium complexes containing amide functionality

Penta and tetra coordinated germanium complexes have been synthesized from N,N’-bis(2-pyridyl)pyridine-2,6-dicarboxamide (H2L) and N-(pyridine-2-yl)picolinamide (HL1) with dialkyl/aryl and trialkyl/aryl germanium halides in 1:1 molar ratios. Th

N-(Pyridin-2-yl)picolinamide tetranickel clusters: Synthesis, structure and ethylene oligomerization

A series of N-(pyridin-2-yl)picolinamide derivatives was synthesized and characterized. Tetranickel complexes were obtained by stoichiometric reaction of NiBr2 and corresponding ligands, and characterized by elemental and spectroscopic analysis. Moreover, the coordination pattern of complex 3a was confirmed by single-crystal X-ray diffraction. In the structure, two ligands linked two nickel atoms to form a unit, and two units were bridged via μ3-OMe and μ2-Br to form a tetranickel cluster. These Ni(II) complexes were investigated in ethylene oligomerization and found to exhibit remarkable catalytic activities upon activation with MAO. Reaction conditions as well as ligand environment significantly affected the catalytic performance of the nickel complexes; the highest activity could be achieved to be 2.7 × 106 g mol-1 Ni h-1.

Modulation of N^N′-bidentate chelating pyridyl-pyridylidene amide ligands offers mechanistic insights into Pd-catalysed ethylene/methyl acrylate copolymerisation

The efficient copolymerisation of functionalised olefins with alkenes continues to offer considerable challenges to catalyst design. Based on recent work using palladium complexes containing a dissymmetric N^N′-bidentate pyridyl-PYA ligand (PYA = pyridylidene amide), which showed a high propensity to insert methyl acrylate, we have here modified this catalyst structure by inserting shielding groups either into the pyridyl fragment, or the PYA unit, or both to avoid fast β-hydrogen elimination. While a phenyl substituent at the pyridyl side impedes catalytic activity completely and leads to an off-cycle cyclometallation, the introduction of an ortho-methyl group on the PYA side of the N^N′-ligand was more prolific and doubled the catalytic productivity. Mechanistic investigations with this ligand system indicated the stabilisation of a 4-membered metallacycle intermediate at room temperature, which has previously been postulated and detected only at 173 K, but never observed at ambient temperature so far. This intermediate was characterised by solution NMR spectroscopy and rationalises, in part, the formation of α,β-unsaturated esters under catalytic conditions, thus providing useful principles for optimised catalyst design.

Direct Amidation of Esters by Ball Milling**

The direct mechanochemical amidation of esters by ball milling is described. The operationally simple procedure requires an ester, an amine, and substoichiometric KOtBu and was used to prepare a large and diverse library of 78 amide structures with modest to excellent efficiency. Heteroaromatic and heterocyclic components are specifically shown to be amenable to this mechanochemical protocol. This direct synthesis platform has been applied to the synthesis of active pharmaceutical ingredients (APIs) and agrochemicals as well as the gram-scale synthesis of an active pharmaceutical, all in the absence of a reaction solvent.

Copper(I)-catalysed aerobic oxidative selective cleavage of C[sbnd]C bond with DMAP: Facile access to N-substituted benzamides

A base/DMAP system for efficient oxidative cleavage of C(CO)–C(alkyl) bond to generate N-substituted benzamides has been developed in the presence of copper(I) chloride. The usage of inexpensive copper catalyst, broad substrate scope, mild conditions make

Mapping out the Relative Influence of Hydrogen and Halogen Bonds in Crystal Structures of a Family of Amide-Substituted Pyridines

The simultaneous use of hydrogen bonds and halogen bonds in crystal engineering strategies has previously been employed in order to generate new solid forms with applications in e.g. pharmaceutical and agrochemical industries. Unfortunately, it is not eas

Direct Transformation of Alkylarenes into N-(Pyridine-2-yl)amides by C(sp3)–C(sp3) Bond Cleavage

C(sp3)–H bond functionalization and C(sp3)–C(sp3) bond cleavage are very challenging transformations in chemistry. Herein, we report a mild and green methodology for the construction of N-(pyridine-2-yl)amides via tandem C(sp3)–H activation/C–C bond cleavage of alkylarenes. Various N-heterocyclic amides were directly synthesized from alkylarenes in water in moderate to good yields.

Olefin Dimerization and Isomerization Catalyzed by Pyridylidene Amide Palladium Complexes

A series of cationic palladium complexes [Pd(N^N′)Me(NCMe)]+ was synthesized, comprising three different N^N′-bidentate coordinating pyridyl-pyridylidene amide (PYA) ligands with different electronic and structural properties depending on the PYA position (o-, m-, and p-PYA). Structural investigation in solution revealed cis/trans isomeric ratios that correlate with the donor properties of the PYA ligand, with the highest cis ratios for the complex having the most donating o-PYA ligand and lowest ratios for that with the weakest donor p-PYA system. The catalytic activity of the cationic complexes [Pd(N^N′)Me(NCMe)]+ in alkene insertion and dimerization showed a strong correlation with the ligand setting. While complexes bearing more electron donating m- and o-PYA ligands produced butenes within 60 and 30 min, respectively, the p-PYA complex was much slower and only reached 50% conversion of ethylene within 2 h. Likewise, insertion of methyl acrylate as a polar monomer was more efficient with stronger donor PYA units, reaching a 32% ratio of methyl acrylate vs ethylene insertion. Mechanistic investigations about the ethylene insertion allowed detection, for the first time, by NMR spectroscopy both cis- and trans-Pd-ethyl intermediates and, furthermore, revealed a trans to cis isomerization of the Pd-ethyl resting state as the rate-limiting step for inducing ethylene conversion. These PYA palladium complexes induce rapid double-bond isomerization of terminal to internal alkenes through a chain-walking process, which prevents both polymerization and also the conversion of higher olefins, leading selectively to ethylene dimerization.

Ce(III)-catalyzed highly efficient synthesis of pyridyl benzamides from aminopyridines and nitroolefins without external oxidants

An efficient synthesis of a variety of pyridyl benzamides from 2-aminopyridines and nitroolefins is described. This rare-earth-metal-catalyzed reaction provides the corresponding products with broad substrate scope in moderate to excellent yields, in the absence of additives and external oxidants. Water is used as the source of the carbonyl oxygen atom in pyridyl benzamides. Furthermore, 2-substituted oxazolo[4,5-b]pyridines are formed in good yields under the standard conditions when 2-aminopyridin-3-ols are used as the substrates.