Results 71 to 80 of about 5,065 (202)

Tertiary Alcohols as Radical Precursors for the Introduction of Tertiary Substituents into Heteroarenes [PDF]

open access: yes, 2019
Despite many recent advances in the radical alkylation of electron-deficient heteroarenes since the seminal reports by Minisci and co-workers, methods for the direct incorporation of tertiary alkyl substituents into nitrogen heteroarenes are limited ...
Fishman, DA   +3 more
core   +2 more sources

Recent Advances in Bioconjugation of Aromatic Amino Acid Residues by a Reactivity‐Guided Approach

open access: yesThe Chemical Record, Volume 26, Issue 2, February 2026.
This review highlights recent advances in the bioconjugation of aromatic amino acids residues, focusing on strategies that leverage their inherent chemical reactivity to enable precise and versatile modifications of biomacromolecules, illustrating relevant applications.
Bruno M. da S. Santos   +3 more
wiley   +1 more source

Preparation of indole alkaloids via 1,4-dihydropyridine stage or cyano-masked iminium intermediates [PDF]

open access: yes, 2004
Methods to synthesise substituted pyridine derivatives utilising 1,4-dihydropyridines were studied. Addition of nucleophiles to N-alkyl pyridinium salts and application of the products to alkaloid synthesis were investigated.
Putkonen, Tiina
core  

Ca2+ transients are not required as signals for long-term neurite outgrowth from cultured sympathetic neurons [PDF]

open access: yes, 1990
A method for clamping cytosolic free Ca2+ ([Ca2+]i) in cultures of rat sympathetic neurons at or below resting levels for several days was devised to determine whether Ca2+ signals are required for neurite outgrowth from neurons that depend on Nerve ...
Murrell, R D   +3 more
core   +2 more sources

First Organocatalytic Asymmetric Synthesis of 1-Benzamido-1,4-Dihydropyridine Derivatives

open access: yesMolecules, 2018
Preliminary results concerning the first asymmetric synthesis of highly functionalized 1-benzamido-1,4-dihydropyridine derivatives via the reaction of hydrazones with alkylidenemalononitriles in the presence of β-isocupreidine catalyst are reported.
Fernando Auria-Luna   +2 more
doaj   +1 more source

Synthesis and chromatographic-separation of the stereoisomers of furnidipine [PDF]

open access: yes, 1993
The four stereoisomers of methyl tetrahydrofuran-2-ylmethyl 2,6-dimethyl-4-(o-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxilate (furnidipine), have been synthesized and separated by chiral chromatography using D-phenylglycine as chiral stationary phase.
Alajarín Ferrández, Ramón   +6 more
core   +3 more sources

Synthesis, spectroscopic characterization, X-ray structure, and DFT calculations of some new 1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxamides. [PDF]

open access: yesPLoS ONE, 2014
A series of novel 1,4-dihydro-2,6- dimethyl-3,5-pyridinedicarboxamides were synthesized and characterized by infrared absorption spectrum (IR), proton nuclear magnetic resonance (1H NMR), elemental analysis, ultraviolet spectrum (UV), and fluorescence ...
Yi Li   +4 more
doaj   +1 more source

Decoding Urease Inhibition: A Comprehensive Review of Inhibitor Scaffolds

open access: yesChemMedChem, Volume 21, Issue 2, January 2026.
Representative functional groups known for urease inhibition are reviewed within diverse scaffolds using structure–activity analyses to identify features associated with high inhibitory activity. Urease is a metalloenzyme produced by a wide range of organisms and plays a critical role in nitrogen microbial metabolism by catalyzing the hydrolysis of ...
Nuno Martinho, Natália Aniceto
wiley   +1 more source

Design and synthesis of novel 4-substituted 1,4-dihydropyridine derivatives as hypotensive agents

open access: yesJournal of Saudi Chemical Society, 2016
Calcium-channel blockers have an important role in the treatment of several cardiovascular disorders. Derivatives of 1,4-dihydropyridines are one of the most potent calcium antagonists.
Prasanna A. Datar, Pratibha B. Auti
doaj   +1 more source

Transfer Hydrogenation: Advances in Manganese and Nickel Metal Catalysis

open access: yesJournal of Chemistry, Volume 2026, Issue 1, 2026.
Transfer hydrogenation (TH) of ketones, catalyzed by transition–metal complexes, produces alcohols, which are important building blocks in the pharmaceutical and fine chemical industries. For a long time, catalysts based on noble metals such as ruthenium, rhodium, and iridium have dominated the TH of ketones.
James Kamau   +3 more
wiley   +1 more source

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