Three-Step One-Pot Photocatalytic Oxidation of Feedstocks and Organocatalytic Sequential Cascade to Access Enantioenriched α-Aminonitriles. [PDF]
ChemSusChemA one‐pot, three‐step cascade from simple feedstocks to chiral building blocks is reported. By merging organic photocatalysis and noncovalent organocatalysis, benzylic substrates are transformed into enantioenriched α‐aminonitriles via CH photooxidation, imine formation, and asymmetric Strecker reaction. The method affords good yields, up to 96:4 e.r.,
Perulli S +7 more
europepmc +2 more sources
Advanced Synthesis &Catalysis, Volume 365, Issue 19, Page 3234-3240, October 13, 2023., 2023 Abstract The potential of phosphites as nucleophiles for the asymmetric synthesis of chiral chromene derivatives has been overlooked in the literature. Herein, we report a promising approach via asymmetric organocatalyzed phospha‐Michael addition to iminochromenes, using a bifunctional squaramide, which gives access to chromenylphosphonates, an ...
Eugenia Marqués‐López +4 more
wiley +1 more source
Recovering European River Invertebrate Communities Homogenize or Differentiate Depending on Anthropogenic Stress. [PDF]
Glob Chang Biol(a) European river invertebrate communities showed an average increase in local richness over time (1994–2023), indicating partial local recovery following the alleviation of anthropogenic stress (e.g., point‐source pollution). However, this local recovery was not accompanied by increases in β‐diversity, likely due to persistent, unaddressed stressors,
Cortés-Guzmán D +9 more
europepmc +2 more sources
Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow (Ammodramus Caudacutus) [PDF]
, 2012 Understanding the spatial scale of gene flow can yield valuable insight into the ecology of an organism and guide conservation strategies. Fine-scale genetic structure is uncommon in migratory passerines because of their high vagility and presumed high ...
Babbitt, Kimberly J. +3 more
core +2 more sources
The aminoindanol core as a key scaffold in bifunctional organocatalysts
Beilstein Journal of Organic Chemistry, 2016 The 1,2-aminoindanol scaffold has been found to be very efficient, enhancing the enantioselectivity when present in organocatalysts. This may be explained by its ability to induce a bifunctional activation of the substrates involved in the reaction. Thus,
Isaac G. Sonsona +2 more
doaj +1 more source
Comportamiento mecánico ante la sobrexpansión de stents de cromo-cobalto comparados con stents de acero inoxidable, implantados en la aorta abdominal de conejos hipercolesterolémicos [PDF]
, 2018 Introducción: La fisiopatología de la disfunción diastólica del ventrículo izquierdo incluye alteraciones de la relajación ventricular, rigidez elástica pasiva o una combinación de ambos mecanismos.
Berrocal, Daniel +5 more
core +1 more source
Revista Científica General José María Córdova, 2011 La guerra asimétrica se presenta como la innovación característica de la mayoría de conflictos del sistema internacional posterior a la Guerra Fría, incrementados por el sistema internacional anti terrorista posterior al 11 de septiembre.
Juan Ricardo Sánchez Hurtado +3 more
doaj +1 more source
Synthesis and supramolecular self-assembly of glutamic acid-based squaramides
Beilstein Journal of Organic Chemistry, 2018 We describe the preparation and characterization of two new unsymmetrical squaramide-based organogelators. The synthesis of the compounds was carried out by subsequent amine condensations starting from dimethyl squarate.
Juan V. Alegre-Requena +6 more
doaj +1 more source
¿Por qué predominan los gobiernos de mala calidad?
Panorama Económico, 2005 Este documento analiza la abstención electoral de los votantes como un problema de información asimétrica en el mercado político. A través del esquema de análisis planteado por George Akerlof (1970), se sugiere que la existencia de programas de gobierno ...
Jorge Luis Navarro
doaj +1 more source
Intramolecular Hydrogen Bond in Biologically Active o-Carbonyl Hydroquinones
Molecules, 2014 Intramolecular hydrogen bonds (IHBs) play a central role in the molecular structure, chemical reactivity and interactions of biologically active molecules.
Maximiliano Martínez-Cifuentes +3 more
doaj +1 more source