Results 21 to 30 of about 44,314 (270)

The Cycloaddition of the Benzimidazolium Ylides with Alkynes: New Mechanistic Insights. [PDF]

PLoS ONE, 2016
New insights concerning the reaction mechanism in the cycloaddition reaction of benzimidazolium ylides to activated alkynes are presented. The proposed pathway leading both to 2-(1H-pyrrol-1-yl)anilines and to pyrrolo[1,2-a]quinoxalin-4(5H)-ones involves
Costel Moldoveanu, Gheorghita Zbancioc, Dorina Mantu, Dan Maftei, Ionel Mangalagiu   +4 more
doaj   +1 more source

Efficient fabrication of oxazolidinones for the carboxylative cyclization with carbon dioxide

Journal of CO2 Utilization, 2023
Overuse of fossil energy has accelerated the development of industrialization and improved the quality of human life. However, it also leads to the excessive emission of CO2, and the greenhouse effect is threatening global climate stability and human ...
Xin Yang, Lekai Xu, Yaqiong Zhu, Shaojun Zhang, Guanwei Jia, Jiang Du   +5 more
doaj   +1 more source

Highly Efficient Construction of Sugar-Fused Spirochromanono Pyrrolidines/Pyrrolizidines/Thiolizidines via 1,3-Dipolar Cycloaddition of Azomethine Ylides

SynOpen, 2017
A variety of sugar-fused chromanono pyrrolidines/pyrrolizidines/thiolizidines have been synthesized by intermolecular 1,3-dipolar cycloaddition reaction of azomethine ylides (generated from glucose aldehyde and different secondary amino acids) with ...
Sirisha Nallamala, Srikumar Mannem, Raghunathan Raghavachary   +2 more
doaj   +1 more source

Oxidation-controlled, Strain-Promoted Tellurophene-Alkyne Cycloaddition (OSTAC): A Bioorthogonal Reaction for Fast and Selective Protein Conjugation

, 2022
Noncanonical amino acids (ncAAs) bearing functional groups for bioorthogonal labelling are useful tools for the downstream analysis of nascent polypeptides.
Mark, Nitz, Yong, Jia Bu
core   +1 more source

Ab initio study of the mechanism of formation of a spiro-Sn-heterocyclic ring compound by the cycloaddition reaction of H2C=Sn: and ethylene [PDF]

Journal of the Serbian Chemical Society, 2019
X2C=Sn: (X = H, Me, F, Cl, Br, Ph, Ar…) are new species of chemistry. The cycloaddition reactions of X2C=Sn: is a new study field of stannylene chemistry.
Tan Xiaojun, Lu Xiuhui
doaj   +1 more source

Cycloaddition Reaction

, 2020
1,3-Dipolar cycloaddition reaction between organic azide and metal carbyne is a useful strategy to construct metallacycles. However, the electronic behavior of organic azide in 1,3-dipolar cycloaddition reactions is less explored.
Zhenyang Lin, Lu, Zhengyu, Fu Kit Sheong, Zhang, Hong, Zhengyu Lu, Sheong, Fu Kit, Zhang, Jing Xuan, Hong Zhang, Lin, Zhenyang, Jing‐Xuan Zhang   +9 more
core   +1 more source

1,2,4-Oxadiazoles from cycloreversions of oxadiazabicyclo[3.2.0]heptenes: 1-azetines as thiocyanate equivalents [PDF]

, 2013
1,3-Dipolar cycloaddition of nitrile oxides to 4-aryl-2-alkylthio-1-azetines gave a series of oxadiazabicyclo[3.2.0]heptenes as single diastereoisomers. Heating these cycloadducts in toluene resulted in an overall [2+2]-cycloreversion to give 5-alkylthio-
Khan, Musharraf, Khan, Musharraf N., O'Gorman, Paul A., Pitard, Arnaud, Hemming, Karl, O'Gorman, P.A.   +5 more
core   +1 more source

Incorporation of Spin Labels and Paramagnetic Tags for Magnetic Resonance Studies Using Cycloaddition Reactions as a Tool

Reactions
The cycloaddition reaction is one of the most common reactions in organic chemistry. It has been applied in various fields. Herein, we focus on the application of cycloaddition reactions in investigating biological molecules and materials using magnetic ...
Amarendra Nath Maity, Amiya Kumar Medda, Shyue-Chu Ke   +2 more
doaj   +1 more source

Diels–Alder reactions in confined spaces: the influence of catalyst structure and the nature of active sites for the retro-Diels–Alder reaction

Beilstein Journal of Organic Chemistry, 2016
Diels–Alder cycloaddition between cyclopentadiene and p-benzoquinone has been studied in the confined space of a pure silica zeolite Beta and the impact on reaction rate due to the concentration effect within the pore and diffusion limitations are ...
Ángel Cantín, M. Victoria Gomez, Antonio de la Hoz   +2 more
doaj   +1 more source

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