Results 41 to 50 of about 1,953 (209)

Gold(I)-Catalyzed Aromatization: Expeditious Synthesis of Polyfunctionalized Naphthalenes

iScience, 2019
Summary: A gold-catalyzed 6-endo-dig carbocyclization of alkyne with the pendent diazo group is reported. It provides an expeditious approach for the synthesis of multi-functionalized naphthalene derivatives under mild conditions.
Cheng Zhang, Kemiao Hong, Shanliang Dong, Chao Pei, Xiaolu Zhang, Ciwang He, Wenhao Hu, Xinfang Xu   +7 more
doaj   +1 more source

Site Density Governs Switching Reactivity Regimes During Aerobic C─H Oxidation in Mn Single‐Atom Photocatalysts

Angewandte Chemie International Edition, EarlyView.
Increasing the density of isolated manganese (Mn) atoms in carbon nitride (CNx) photocatalysts does not continuously improve performance. Instead, beyond a critical loading, the polymer support reorganizes, altering charge‐carrier dynamics and oxygen activation while preserving atomic dispersion.
Viktoria Velichko, Agustín de Arriba, Areti Moutsiou, Elisabetta Inico, Andrea Olivati, Berta Pérez‐Román, Jesús López‐Sánchez, Ik Seon Kwon, Andrea Tonelli, Abhijit Roy, Valentina De Renzi, Raul Arenal, Annamaria Petrozza, Carlo Cavallotti, Gianvito Vilé   +14 more
wiley   +1 more source

Stereoselective Synthesis of Polyfunctionalized Nitrones through Conjugate Addition of α-Halo Hydrazones to Nitroso Compounds

, 2021
In the presence of Na2CO3, conjugate addition of α-halo hydrazones to nitroso compounds proceeded readily to give polyfunctionalized nitrones in reasonable chemical yields and excellent stereoselectivities.
Zhao, Hong-Wu
core   +1 more source

Green approaches for the synthesis of poly-functionalized imidazole derivatives: A comprehensive review

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, Devendra Kumar Dewangan, Nikita Bhakat, Subhash Banerjee   +3 more
doaj   +1 more source

Synthesis of Polyfunctionalized Pyrroles by a PPh3-Promoted Condensation Reaction Between Ammonium Acetate, Dialkyl Acetylenedicarboxylate and Arylglyoxals [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2017
A simple and efficient synthesis of some polyfunctionalized pyrrole derivatives by a triphenylphosphine-promoted condensation reaction between dialkyl acetylenedicarboxylates, arylglyoxals, and ammonium acetate is described.
Hossein Anaraki-Ardakani, Parisa Nkomanesh   +1 more
doaj  

Hypervalent Iodine Phenol Dearomatization Mediated by Mechanochemistry

Chemistry – A European Journal, EarlyView.
A solvent‐free mechanochemical process has been developed that enables the rapid oxidative dearomatization of phenols. This method produces spiranic dienones with decent to good yields. This process eliminates the need for expensive and environmentally harmful perfluorinated alcohols, such as hexafluoroisopropanol and trifluoroethanol, while adhering ...
Jérémie Cuillerier, Camille Rocq, Xavier Ottenwaelder, Sylvain Canesi   +3 more
wiley   +1 more source

Synthesis of Polyfunctionalized Quinolines via the Sequence of Propargyl–Allenyl Isomerization and Aza-electrocyclization

, 2016
Quinoline derivatives are important heterocyclic compounds because of their natural occurrence and applications in pharmaceutical fields. In this paper, a sequence of propargyl–allenyl isomerization and aza-electrocyclization for the synthesis of ...
Shimin Xu (2032816), Le Liu (167133), Hongwei Zhou (93199)   +2 more
core   +1 more source

Nucleophilic Reactions of Cyclobutenones and the Related 4,4‐Dichlorocyclobutenone Derivatives

European Journal of Organic Chemistry, EarlyView.
Cyclobutenone derivates and their 4,4‐dichloro counterparts have an uninterrupted attention as useful synthons in the synthesis of complex organic molecules. Their nucleophilic reactions remain underexplored. This review brings attention to these reactions, whose outcome is not straightforward.
Sarah J. Wright, Muhluri H. Mthombeni, Songeziwe Ntsimango   +2 more
wiley   +1 more source

Highly diastereoselective access to polyfunctionalized 1,3-oxazines promoted by Brønsted/Lewis acids

, 2018
The Brønsted/Lewis acid catalyzed reaction of α-alkyloxyamides tethered to α,β-unsaturated ketones (aldehydes) afforded exclusively polyfunctionalized 1,3-oxazines with high diastereoselectivities and in high yields.
Clovis Peter, Philippe Geoffroy, Michel Miesch, Peter, Clovis, Geoffroy, Philippe, Miesch, Michel   +5 more
core   +1 more source

Novel tetronamides derived from mucobromic acid: synthesis, structural elucidation, DFT calculations and phytotoxic activity

Pest Management Science, EarlyView.
The acyclic mucobromic acid, activated by (1S)‐(+)‐10‐camphorsulfonic acid, afforded the chiral compound 1b, precursor for aza‐Michael addition/elimination on the butenolide yielding tetronamides 2b‐7b. Their relative SRSR configuration was confirmed by the spectrometric methods, DFT calculation and statistical methods.
Kamylla CF Faria, Vitor C Baia, Elson S Alvarenga   +2 more
wiley   +1 more source