Results 61 to 70 of about 3,577 (190)

Synthesis of 2-substituted 9-oxa-guanines {5-aminooxazolo[5,4-d]pyrimidin-7(6H)-ones} and 9-oxa-2-thio-xanthines {5-mercaptooxazolo[5,4-d]pyrimidin-7(6H)-ones}

Beilstein Journal of Organic Chemistry, 2008
Oxazolo[5,4-d]pyrimidines can be considered as 9-oxa-purine analogs of naturally occurring nucleic acid bases. Interest in this ring system has increased due to recent reports of biologically active derivatives.
Subrata Mandal, Wen Tai Li, Yan Bai, Jon D. Robertus, Sean M. Kerwin   +4 more
doaj   +1 more source

dipolar cycloaddition

, 2008
Citation: 'dipolar cycloaddition' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.D01754 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

High‐performance electro‐optic materials featuring enhanced thermal stability through dual‐donor structural crosslinking engineering

Smart Molecules, EarlyView.
A groundbreaking dual‐donor crosslinking strategy was reported to significantly enhance the thermal stability, achieving remarkable EO coefficients (257–301 pm/V), glass transition temperatures (Tg) ranging from 107–187°C, and ultrahigh chromophore densities (3.73–4.26 × 10²⁰ molecules/cm³) with exceptional long‐term stability after 500 h at 85°C ...
Yu Zhang, Ziyun Zheng, Zhihan Huang, Zhifan Liu, Youling Chen, Fuyang Huo, Fenggang Liu, Xiubin Xu   +7 more
wiley   +1 more source

Synthesis and reinvestigation of tetrazocines [PDF]

, 2004
This thesis is concerned with the study of tetrazocines. These rare, eight-membered ring systems containing four nitrogen atoms are in the infancy of their development. Little is known of their potential application, properties and generation.
Healy, Cathal
core  

Synthesis of 1,4-Disubstituted Mono and Bis-triazolocarbo-acyclonucleoside Analogues of 9-(4-Hydroxybutyl)guanine by Cu(I)-Catalyzed Click Azide-Alkyne Cycloaddition

, 2011
A series of novel mono-1,2,3-triazole and bis-1,2,3-triazole acyclonucleoside analogues of 9-(4-hydroxybutyl)guanine was prepared via copper(I)-catalyzed 1,3-dipolar cycloaddition of N-9 propargylpurine, N-1-propargylpyrimidines/as-triazine with the ...
Krim, Jamal, Taourirte, Mohamed, Engels, Joachim W., Moha Taourirte, Jamal Krim, Joachim W. Engels   +5 more
core   +1 more source

1,1‐Disubstituted Vinylbromides: Versatile Building Blocks for the Synthesis of Nitrogen‐Containing Heterocycles

European Journal of Organic Chemistry, Volume 29, Issue 23, 16 June 2026.
1,1‐Disubstituted vinylbromides are key intermediates for constructing nitrogen‐containing heterocycles. This review provides an overview of the synthetic applications of 1,1‐disubstituted vinylbromides and summarizes recent developments in reaction methodologies, mechanistic insights, and the structural diversity of N‐heterocyclic compounds accessible
Anne Westermeyer, Jun Fang, Chonghuo Liu, Guillaume Lefèvre, Gérard Guillamot, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +6 more
wiley   +1 more source

The Fragmentation of 2,3-Dihydroisothiazol-3-one 1,1-Dioxide Derivatives: A Novel Cheletropic Process

CHIMIA, 1992
Adducts obtained by 1,3-dipolar cycloadditions to 2,3-dihydroisothiazol-3-one 1,1-dioxides are inclined to undergo a cheletropic process, by which the newly formed heterocyclic part undergoes aromatization, while SO2 is extruded and an ...
Kaspar F. Burri
doaj   +2 more sources

1,3‐Dipolar Cycloaddition of Dipolar Reagents to Bis(styryl) Sulfones.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
V. Padmavathi, K. Venugopal Reddy, A. Balaiah, T. V. Ramana Reddy, D. Bhaskar Reddy   +4 more
openaire   +1 more source

N‐Glycosyl Triazoline Glycomimetics via Huisgen Cycloaddition With an Electron‐Deficient Alkene and BF3‐Catalysed Triazoline Fragmentation to Aziridines

European Journal of Organic Chemistry, Volume 29, Issue 22, 9 June 2026.
Glycomimetics with triazoline and aziridine groups were synthesised via diastereoselective Huisgen cycloaddition from glycosyl azides. Density functional theory was applied to define the mechanism for BF3 promoted aziridine formation. Triazoline and aziridine derivatives were synthesised by diastereo‐ and regioselective Huisgen cycloaddition of 2,3,4,6‐
Aaron McCormack, Ashis Dhara, Lamis Alaa Eldin Refat, Mikael Bols, Paul V. Murphy   +4 more
wiley   +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