Results 61 to 70 of about 4,131 (247)
Stereoselective cyanation of 4-formyl and 4-imino-β-lactams: Application to the synthesis of polyfunctionalized γ-lactams [PDF]
, 2012 The stereoselective reaction of 4-oxoazetidine-2-carbaldehydes and their corresponding imines with cyanide-based reagents give β-lactam α-aminonitriles, which are chameleonic building blocks for the controlled synthesis of a variety of new compounds ...
Alcaide, Benito +3 more
core +2 more sources
A catalytic highly enantioselective direct synthesis of 2-bromo-2-nitroalkan-1-ols through a Henry reaction [PDF]
, 2008 Highly enantiomerically enriched 2-bromo-2-nitroalkan-1-ols are prepared by direct condensation of aliphatic and aromatic aldehydes with bromonitromethane in the presence of a catalytic amount of copper(II) acetate and a C1-symmetric camphorderived amino
Blay Llinares, Gonzalo +2 more
core +2 more sources
Beilstein Journal of Organic Chemistry, 2016 Enantiomerically pure β-aminoalcohols, produced through an organocatalytic Mannich reaction, were subjected to an Ugi multicomponent reaction under classical or Lewis acid-promoted conditions with diastereoselectivities ranging from moderate to good ...
Samantha Caputo +5 more
doaj +1 more source
Radical Fluoroalkylation Reactions [PDF]
, 2018 Recent protocols and reactions for catalytic radical perfluoroalkylations will be described. The production of perfluoroalkyl radicals (RF = CnF2n+1, n ≥ 2), which effect both addition and substitution reactions on organic substrates, can be realized ...
Barata Vallejo, Sebastian +2 more
core +1 more source
Imbalanced nutrients as triggers for black shale formation in a shallow shelf setting during the OAE 2 (Wunstorf, Germany) [PDF]
, 2012 During the oceanic anoxic event 2 (OAE 2) in the Mid-Cretaceous Period, widespread black shale (BS) formation occurred, reflecting perturbations in major biogeochemical cycles.
F. Wiese, M. Blumenberg
core +1 more source
Results in ChemistryFor the preparation of polyfunctionalized piperidine scaffolds, a radical tandem five-condensation domino Knoevenagel-intramolecular [4 + 2] aza-Diels-Alder imin-based reaction was used.
Farzaneh Mohamadpour
doaj +1 more source
Bicyclization Involving Pseudo-Intramolecular Imination with Diamines [PDF]
, 2011 α-Nitro-δ-keto nitriles and α-nitro-δ-keto ester were readily converted to diazabicyclo compounds having vicinal functionality upon treatment with diamines.
839 +9 more
core +2 more sources
Current Research in Green and Sustainable Chemistry, 2021 The naturally occurring five-member imidazole derivatives have shown interesting biological as well as physiochemical properties and consequently they have found several chemicals, optical, pharmaceutical, and other useful biological applications.
Geetika Patel +3 more
doaj +1 more source
Chelating effect in short polymers for the design of bidentate binders of increased affinity and selectivity [PDF]
, 2015 The design of new strong and selective binders is a key step towards the development of new sensing devices and effective drugs. Both affinity and selectivity can be increased through chelation and here we theoretically explore the possibility of ...
Fogolari, Federico +2 more
core +3 more sources
Rapid Communications in Mass Spectrometry, EarlyView.ABSTRACT Rationale Electrospray (ESI), the most popular desorption/ionization technique used in mass spectrometry‐based metabolomics, generates both protonated and deprotonated molecules, as well as adduct ions, sodium being the most frequent monoatomic cation entering their composition.
Annelaure Damont +9 more
wiley +1 more source