Results 91 to 100 of about 27,751 (287)

Solvent incorporated sequential [3 + 2] annulation/substitution reaction of azomethine imines and propargyl sulfur ylide.

Organic and biomolecular chemistry, 2018
A novel solvent incorporated sequential [3 + 2] cycloaddition/substitution reaction of azomethine imines with propargyl sulfur ylide was developed. In the actual three-component reaction, propargyl sulfur ylide acts as a dipole reagent to furnish the ...
Shoujie Shen, Yanli Yang, Jiangyan Duan, Zhenhu Jia, Jinyan Liang   +4 more
semanticscholar   +1 more source

Recent Advancements in the Cyclization Strategies of 1,3‐Enynes Towards the Synthesis of Heterocyclic/Carbocyclic Frameworks

Chemistry – An Asian Journal, Volume 20, Issue 8, April 17, 2025.
In this review, the advancements in the cyclization of 1,3‐enynes to construct structurally diverse heterocyclic and carbocyclic frameworks are portrayed comprehensively. Divergent cyclization protocols along with mechanistic aspects for key transformations are also detailed. Abstract 1,3‐Enynes have demonstrated their utility as valuable precursors to
Akash P. Sakla, Shams Aaghaz, Shujauddin Ahmed, Naziya Neshat, Ahmed Kamal   +4 more
wiley   +1 more source

A Simple Method for Anchoring Silver and Copper Nanoparticles on Single Wall Carbon Nanotubes

Nanomaterials, 2019
Single walled carbon nanotubes (SWCNT) were functionalized using the 1,3-dipolar cycloaddition reaction of an azomethine ylide under solvent-free conditions, a one-pot procedure that yields pyrrolidine type of groups at the nanotubes surface.
Mariana M. Silva, Daniel Ribeiro, Eunice Cunha, M. Fernanda Proença, Robert J. Young, Maria C. Paiva   +5 more
doaj   +1 more source

Pyrrolodiazines. 4. Structure and chemistry of 3,4-dihydropyrrolo[1,2-a]pyrazine [PDF]

, 1997
The structure of 3,4-dihydropyrrolo[1,2-a]pyrazine and its N-protonated form is studied by ab initio calculations. Examples of the reactivity of this poorly studied system are presented in which it is shown that the imino moiety does not react with ...
Andrés, José L. de, Castaño González, Obis Dionisio, Castellote Álvaro, María Isabel, García Navío, José Luis, Minguez Ortega, José Miguel, Vaquero López, Juan José, Álvarez-Builla Gómez, Julio   +6 more
core   +3 more sources

Organic Transformations Utilizing 1,5,7‐Triazabicyclo[4.4.0]Dec‐5‐Ene (TBD): A Tale of Two Nitrogens

European Journal of Organic Chemistry, Volume 28, Issue 12, March 24, 2025.
1,5,7‐Triazabicyclo[4.4.0]dec‐5‐ene (TBD) is a bicyclic guanidine that has drawn considerable attention in organic synthesis. Its multifunctionality and versatility makes it an ideal reagent to promote various reactions. This review provides a concise guide to recent developments and organic transformations utilizing TBD, classified by the primary ...
Chunling Blue Lan, Karine Auclair
wiley   +1 more source

An Efficient Synthesis of Novel Dispirooxindole Derivatives via One-Pot Three-Component 1,3-Dipolar Cycloaddition Reactions

Molecules, 2012
A series of novel dispirooxindoles have been synthesized through three-component 1,3-dipolar cycloaddition of azomethine ylides generated in situ by the decarboxylative condensation of isatin and an α-amino acid with the dipolarophile 5-benzylidene-1,3 ...
Yucheng Wang, Juxian Wang, Hongtao Liu, Huiyuan Wang, Wei Lin, Lexing Xu, Zhibin Huang, Gang Chen, Qian Zhao, Daqing Shi   +9 more
doaj   +1 more source

Synthesis of 5,6-dihydro-2H-pyran-2-ones (microreview) [PDF]

, 2016
[Figure not available: see fulltext.][Figure not available: see fulltext.] 5,6-Dihydro-2H-pyran-2-ones constitute an important class of heterocyclic compounds which also may be considered as α,β-unsaturated δ-lactones.
Eskandari, K., Rafieian-Kopaei, M.
core   +1 more source

2‐Aminoindoles and 2‐Iminoindolines as Viable Precursors of Indole‐Fused Nitrogenated Polyheterocycles

Advanced Synthesis &Catalysis, Volume 367, Issue 6, March 18, 2025.
Abstract The synthesis of architecturally complex polyheterocyclic structures embedding the indole ring represents a growing field of interest. Carbolines and their partially dehydro derivatives, pyrazinoindoles, indoloindoles, azepinoindoles and other medium‐sized derivatives are only some examples of indole‐containing polycyclic compounds featured by
Alessandro Palmieri, Marino Petrini
wiley   +1 more source

Catalytic asymmetric synthesis of highly substituted pyrrolizidines [PDF]

, 2012
A catalytic asymmetric double (1,3)-dipolar cycloaddition reaction has been developed. Using a chiral silver catalyst, enantioenriched pyrrolizidines can be prepared in one flask from inexpensive, commercially available starting materials.
Codelli, Julian A., Lim, Andrew D., Reisman, Sarah E.   +2 more
core  

Phosphoramidite-Cu(OTf)2 complexes as chiral catalysts for 1,3-dipolar cycloaddition of iminoesters and nitroalkenes [PDF]

, 2013
Chiral complexes formed by phosphoramidites such as (Sa,R,R)-9 and Cu(OTf)2 are excellent catalysts for the general 1,3-dipolar cycloaddition between azomethine ylides and nitroalkenes affording the corresponding tetrasubstituted proline esters mainly as
Castelló Moncayo, Luis Miguel, Cossío Mora, Fernando Pedro, Cózar Ruano, Abel de, Larrañaga Agirre, Olatz, Nájera, Carmen, Sansano, Jose M.   +5 more
core   +2 more sources