Results 111 to 120 of about 20,092 (323)
Cobalt(iii)-catalyzed site-selective C–H amidation of pyridones and isoquinolones
RSC Advances, 2018 In this study, Cp*Co(iii)-catalyzed site-selective amidation of pyridones and isoquinolones using oxazolones as the amidation reagent is reported. This approach features mild conditions, high efficiency and good functional tolerance.
Feng Gao +5 more
semanticscholar +1 more source
Structural and molecular biology of a protein-polymerizing nanomachine for pilus biogenesis [PDF]
, 2017 Bacteria produce protein polymers on their surface called pili or fimbriae that serve either as attachment devices or as conduits for secreted substrates.
Waksman, Gabriel
core +1 more source
Chemical constitutions in the Colour Index™: A century of colourant classification
Coloration Technology, Volume 141, Issue 4, Page 427-472, August 2025.Abstract This article details how the Colour Index™ (CI) system categorises and unambiguously labels commercial dyes and pigments based upon their chemical constitutions. It outlines the current process by which colourants that are new to the market find a place within CI and acquire generic identifiers.
Andrew Towns
wiley +1 more source
Synthesis and Cyclizations of N-(2,3-, 3,4- and 3,5-Dimethylphenyl)-β-alanines
Molecules, 2005 A series of 1-aryl substituted dihydro-, 5-methyldihydro- and 6-methyl-dihydro-2,4(1H,3H)pyrimidinediones and their 2-thio analogues were obtained byreaction of the corresponding β-alanines or α-methyl- and β-methyl-β-alanines with ureaor ...
Gema Mikulskiene +2 more
doaj +1 more source
The FASEB Journal, Volume 39, Issue 14, 31 July 2025.Maternal circulatory L‐tryptophan (TRP) and nicotinamide (NAM) levels are proportional to dietary TRP intake. Yolk sacs, but not embryos, perform NAD de novo synthesis. This study explores the exchange of NAD precursors between mother and conceptus, and NAD generation in conceptal tissues via the NAD de novo synthesis (blue) or salvage (red) pathways ...
Kayleigh Bozon +6 more
wiley +1 more source
Tailored Watson–Crick Pairing Partners for Xanthosine in RNA
Chemistry – A European Journal, Volume 31, Issue 42, July 25, 2025.RNAs with kappa‐xanthosine (K–X) or 2‐iminocytidine‐xanthosine (2imC–X) base pairs form stable double helices that have higher melting temperatures than those of the A–U or G–U references. Access to these novel 2imC‐modified RNAs is possible through the mild, selective chemical conversion of 2‐thiocytidine RNA precursors.
Stefan Mair +5 more
wiley +1 more source
Molecules, 2004 The reaction of 4-hydroxycoumarin (1) with some primary amines 2a-h and morpholine (2i) under microwave irradiation occurred without opening of the lactone ring to give N-substituted 4-aminocoumarins 3a-i in excellent yields.
Ivo C. Ivanov, Edmont V. Stoyanov
doaj +1 more source
Organic Letters, 2017 Structurally diverse macrocyclic pyridones can be efficiently synthesized by a rhodium(III)-catalyzed C-H activation/heterocyclization of ω-alkynyl α-substituted acrylic hydroxamates.
J. Krieger +5 more
semanticscholar +1 more source
Asymmetric aerobic oxidative NHC-catalysed synthesis of dihydropyranones utilising a system of electron transfer mediators [PDF]
, 2016 In the context of green chemistry, the replacement of high molecular weight stoichiometric oxidants with O2 is most desirable but difficult. Here, we report the asymmetric aerobic oxidative synthesis of dihydropyranones.
Axelsson, Anton +3 more
core +1 more source
Synthesis of 5-(substituted phenylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridones from ethyl 3-oxo-2-(substituted phenylazo)butanoates, Short communication [PDF]
Journal of the Serbian Chemical Society, 2011 A new procedure for the synthesis of known azo pyridone dyes is presented. A series of 5-(substituted arylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridones were prepared from ethyl 3-oxo-2-(substituted phenylazo)butanoates and cyanoacetamide in acetone using ...
GORDANA UŠĆUMLIĆ +3 more
doaj