Results 71 to 80 of about 16,669 (224)

Cristais líquidos termotrópicos calamíticos contendo o heterociclo [1,2,3]-triazol 1,4-dissubstituído [PDF]

, 2006
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em QuímicaA síntese e as propriedades térmicas de cinco séries homólogas de compostos calamíticos lineares e não lineares,
Santos, Deise Maria Pereira de Oliveira
core  

Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3-b]indolizines from Alkylpyridinium Salts and Enaminones

Molecules, 2020
Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and ...
Ekaterina A. Sokolova, Alexey A. Festa, Karthikeyan Subramani, Victor B. Rybakov, Alexey V. Varlamov, Leonid G. Voskressensky, Erik V. Van der Eycken   +6 more
doaj   +1 more source

Electrophilic Iodination of Heterocyclic Compounds. Recent Advances 2008–2025: Part II

European Journal of Organic Chemistry, Volume 29, Issue 22, 9 June 2026.
Electrophilic iodination using molecular iodine and iodide sources represents an efficient approach for accessing valuable iodinated organic compounds. This review highlights recent advances in the iodination of heterocyclic compounds from 2008 to 2025, emphasizing the role of heteroaryl iodides as important synthetic intermediates for biologically ...
Njomza Ajvazi, Stojan Stavber
wiley   +1 more source

Decarboxylation-Driven Double Annulations: Innovative Multi-Component Reaction Pathways

Molecules
A concerted five-component reaction strategy has been developed, featuring double [3+2] cycloadditions utilizing aspartic acid. This approach provides valuable insights into mechanistic pathways, allowing for the distinction between concerted and ...
Desheng Zhan, Gang Yang, Tieli Zhou, Sashirekha Nallapati, Xiaofeng Zhang   +4 more
doaj   +1 more source

Structural‐to‐Functional Complexity Transformations Enabled by Bridged Polyheterocycles: Access to Cis‐1,3‐Diamines and Amino‐Alcohols

ChemistryEurope, Volume 4, Issue 6, June 2026.
Polycyclic intermediates enable stereocontrolled synthesis of densely functionalized cis‐1,3‐diamine and amino alcohol carbocycles and heterocycles via structural‐to‐functional complexity transformations from low‐complexity starting material. Cis‐1,3‐functionalized carbocycles and saturated heterocycles are ubiquitous motifs in natural products ...
Jiayi Zhu, Erica Benedetti, Laurent Micouin   +2 more
wiley   +1 more source

1,3-Dipolar Cycloaddition Reactions of trans-2-Methylene-1,3-dithiolane 1,3-Dioxide with Nitrones

, 2016
1,3-Dipolar Cycloaddition Reactions of trans-2-Methylene-1,3-dithiolane 1,3-Dioxide with ...
Peter L. Spargo (3042906), Varinder K. Aggarwal (1363332), Richard S. Grainger (1335045), Harry Adams (1327698)   +3 more
core   +1 more source

A porphyrin-centred fullerene tetramer containing an N@C60 substituent [PDF]

Royal Society Open Science, 2018
An N@C60-containing C60 tetramer was synthesized by quadruple 1,3-dipolar cycloaddition (Prato) reaction. This molecule demonstrates the N@C60 qubit's ability to form covalently linked arrays.
Harry Macpherson, Stuart Cornes, Shen Zhou, Kyriakos Porfyrakis   +3 more
doaj   +1 more source

The Dithiirane–Thiosulfine Equilibrium Revisited—A Computational Study of Structure, Thermodynamics and Kinetics

Journal of Physical Organic Chemistry, Volume 39, Issue 6, June 2026.
The dithiirane–thiosulfine equilibrium has been revisited by means of modern computational chemistry tools to shed light on whether stable thiosulfines might be isolated. ABSTRACT Thiosulfines as reactive S‐centered 1,3‐dipoles undergoing (3 + 2)‐cycloadditions are still of interest in the chemistry of sulfur‐rich heterocycles.
Dirk Buddensiek, Thomas Behrens
wiley   +1 more source

Deciphering the properties and reaction mechanism of anhydromevalonate phosphate decarboxylase, a prenylated flavin mononucleotide‐dependent enzyme in the archaeal mevalonate pathway

The FEBS Journal, Volume 293, Issue 11, Page 3303-3319, June 2026.
Characterization of anhydromevalonate phosphate decarboxylase, the UbiD‐family decarboxylase involved in the archaeal mevalonate pathway, was conducted. The enzyme is responsible for the biosynthesis of isoprenoids, such as archaeal membrane lipids, respiratory quinones, and dolichols.
Rino Ishikawa, Natsumi Matsushima, Soma Ishimine, Honoka Nakamoto, Hajime Hayakawa, Yoko Yasuno, Tetsuro Shinada, Hiroshi Kawaide, Tomokazu Ito, Hisashi Hemmi   +9 more
wiley   +1 more source

Antibody-Catalysis of a Bimolecular Asymmetric 1,3-Dipolar Cycloaddition Reaction

, 2016
Antibody-Catalysis of a Bimolecular Asymmetric 1,3-Dipolar Cycloaddition ...
Yunfeng Hu (2255629), Paul Wentworth, (2668996), Jonathan D. Toker (2668999), K. N. Houk (1247004), Kim D. Janda (163029)   +4 more
core   +1 more source