Results 171 to 180 of about 1,413,381 (322)

Lewis Acid-Catalyzed Domino Inverse Electron-Demand Diels-Alder/Thermal Ring Expansion Reaction for the Synthesis of Arene-Annulated Eight-Membered Nitrogen Heterocycles. [PDF]

Org Lett
Große M, Leonhardt CM, Campbell PAR, Wegner HA.   +3 more
europepmc   +1 more source

Advances in Parahydrogen‐Induced Polarization for Nuclear Magnetic Resonance of Peptides, Proteins, and Biopolymers

ChemistryEurope, EarlyView.
Hyperpolarization by parahydrogen‐induced polarization enhances the sensitivity of nuclear magnetic resonance spectroscopy of amino acids, peptides, mini‐proteins, and biopolymers using nonnatural amino acids with unsaturated side chains up to three orders of magnitude.
Gerd Buntkowsky
wiley   +1 more source

Design, Synthesis and Biological Activity Evaluation of β-Carboline Derivatives Containing Nitrogen Heterocycles. [PDF]

Molecules
Wu G, Wang W, Li F, Xu C, Zhou Y, Li Z, Liu B, Shao L, Chen D, Bai S, Wang Z.   +10 more
europepmc   +1 more source

Intramolecular N···F Pnictogen Bond Mitigates the Explosive Behavior of Azido‐L‐Phenylalanines

ChemistryEurope, EarlyView.
An intramolecular N···F pnictogen bond is the key for the chemical stabilization of the fluorinated azido‐L‐phenylalanines, mitigating the risk of explosion and thus facilitating the handling and storage of these materials. Organic azides are versatile intermediates but are plagued by intrinsic instability and potential explosiveness. Here, it is shown
Andrea Pizzi, Eleonora Veronese, Nicola Demitri, Marco Saccone, Pierangelo Metrangolo, Giancarlo Terraneo   +5 more
wiley   +1 more source

Combined Enzyme- and Transition Metal-Catalyzed Strategy for the Enantioselective Syntheses of Nitrogen Heterocycles: (-)-Coniine, DAB-1, and Nectrisine. [PDF]

ACS Omega, 2020
Deardorff DR, Niman SW, Paulsen MI, Sookezian A, Whalen ME, Finlayson CJ, Frivold C, Brown HC, Cannon JS.   +8 more
europepmc   +1 more source

The Challenging P‐Alkylation of Aromatic Phosphorus Heterocycles and Follow‐Up Reactions

ChemistryEurope, EarlyView.
P‐alkylation of λ3σ2‐phosphinines is hindered by weak nucleophilicity and scarce synthetic access, previously requiring multistep routes or extreme electrophiles. A direct ambient‐condition method is reported using 3,5‐bis(trimethylsilyl)‐phosphinine/B(C6F5)3 with esters or iso(thio)cyanates to generate stable 1‐R‐phosphininium salts.
Samantha Frank, Ádám Horváth, Duy Nguyen, Moritz J. Ernst, Simon Steinhauer, Zoltán Benkő, Christian Müller   +6 more
wiley   +1 more source

Synthesis and Energetic Characterization of Borane-Amines on High-Nitrogen Heterocycles. [PDF]

ACS Omega
Lin R, Scherschel NF, Zeller M, Hamlin SG, Snyder M, Son S, Ramachandran PV, Piercey DG.   +7 more
europepmc   +1 more source

Skeletal Editing from Pyridine to Aniline via C‐Insertion and N‐Isomerization

ChemistryEurope, EarlyView.
A concise protocol is presented that converts pyridines into anilines by externalizing the original pyridine nitrogen at either the "ipso" or "ortho" position, which results in para or meta‐primary aniline products. A key carbene‐insertion step precedes nitrogen migration, preserving both ring size and overall structure.
Yun Luo, Jing Dai, Yongchang Wei, Chang Min   +3 more
wiley   +1 more source

Tetraphenylmethane Derivatives Containing Nitrogen Heterocycles

SynOpen
Sambasivarao Kotha, Deepshikha Singh
doaj   +1 more source

Enantioselective Synthesis of Sulfinamidines via Asymmetric Rhodium–Catalyzed Imidation of Sulfenamides

ChemistryEurope, EarlyView.
In this work, a catalytic enantioselective imidation approach is presented for the preparation of enantioenriched sulfinamidines from sulfenamides, employing a chiral dirhodium(II) tetracarboxylate catalyst. This method enables the imidation of N,N‐bisalkyl sulfenamides in yields of up to 98% and enantiomeric ratios up to 98:2, with a catalyst loading ...
Michael Andresini, Théo Bissonnier, Juline Courtois, Pascal Retailleau, Benjamin Darses, Jean‐François Poisson, Tanguy Saget, Philippe Dauban   +7 more
wiley   +1 more source