Results 61 to 70 of about 25,799 (236)

1,3-Dipolar Cycloaddition in the Preparation of New Fused Heterocyclic Compounds via Thermal Initiation

Molecules, 2016
This paper describes the synthesis of precursors with a benzo[b]furan skeleton for the intramolecular 1,3-dipolar cycloaddition of azomethine ylides prepared from N-substituted 3-allyl-aminobenzo[b]furan-2-aldehydes and secondary amines derived from α ...
Martin Porubský, Lukáš Tenora, Milan Potáček   +2 more
doaj   +1 more source

Inverse‐Electron‐Demand Diels–Alder Reaction of Tropone with Graphene Supported on Cu(111)

Small, EarlyView.
The inverse‐electron‐demand Diels–Alder reaction between tropone and graphene supported on Cu(111), catalyzed by B(C6F5)3 or BPh3, gave [4 + 2] and [8 + 2] cycloadducts, respectively. Computations reveal that the cycloadditions become favorable on curved graphene with secondary substrate charge transfer effects and reveal the origins of the product ...
Jia Tu, Wentong Zhou, Lawrence M. Wolf, Mingdi Yan   +3 more
wiley   +1 more source

Multicomponent synthesis of spiropyrrolidine analogues derived from vinylindole/indazole by a 1,3-dipolar cycloaddition reaction

Beilstein Journal of Organic Chemistry, 2016
A new series of spiropyrrolidine compounds containing indole/indazole moieties as side chains have been accomplished via a one-pot multicomponent synthesis.
Manjunatha Narayanarao, Lokesh Koodlur, Vijayakumar G. Revanasiddappa, Subramanya Gopal, Susmita Kamila   +4 more
doaj   +1 more source

Stereochemical diversity in pyrrolidine synthesis by catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides.

Chemical Communications, 2019
The pyrrolidine ring is a privileged structural motif in synthetic and medicinal chemisty. This review aims to highlight the high versatility of the catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides for access to different types of ...
J. Adrio, J. Carretero
semanticscholar   +1 more source

Versatile Photofunctionalization of Carbon Nanotubes via [4 + 2] Cycloaddition: A Facile Route to Hybrid Nanomaterials

Small Science, EarlyView.
A [4 + 2] photocycloaddition of aryl cyclobutyl amines on carbon nanotubes is presented. A photocatalyst oxidizes the cyclic moiety to generate an active species trapped by the nanotube π‐cloud. The method functionalizes nanotubes of different characteristics and is tolerant to different functional groups decorating the amine.
Giacomo De Crescenzo, Paula Sánchez‐Morena, Alberto Fraile, Matías Blanco, José Alemán   +4 more
wiley   +1 more source

Synthesis of 2‐Fluoropyrroles via [4 + 1] Cycloaddition of α,β‐Unsaturated Imines with In Situ‐Generated Difluorocarbene

European Journal of Organic Chemistry, Volume 28, Issue 35, September 26, 2025.
2‐Fluoropyrroles are synthesized via the [4 + 1] cycloaddition of α,β‐unsaturated imines with difluorocarbene, generated in situ from trimethylsilyl 2,2‐difluoro‐2‐(fluorosulfonyl)acetate (TFDA). The α,β‐unsaturated imines are treated with TFDA in the presence of a Proton Sponge catalyst.
Kohei Fuchibe, Takaya Miura, Junji Ichikawa   +2 more
wiley   +1 more source

Copper-Catalyzed Asymmetric Dearomative [3+2] Cycloaddition of Nitroheteroarenes with Azomethines

Molecules, 2023
Catalytic asymmetric dearomative [3+2] cycloaddition of α-imino γ-lactones with either 3-nitroindoles or 2-nitrobenzofurans by using a chiral copper complex as the catalyst was developed.
Yan Chen, Jian-Qiang Zhao, Yan-Ping Zhang, Ming-Qiang Zhou, Xiao-Mei Zhang, Wei-Cheng Yuan   +5 more
doaj   +1 more source

Steuerbare endo/exo‐Selektivität in direkten katalytisch‐ asymmetrischen 1,3‐dipolaren Cycloadditionen mit polyfunktionellen Lewis‐Säure‐/Azolium‐Aryloxid‐Katalysatoren

Angewandte Chemie, Volume 137, Issue 34, August 18, 2025.
Ein neuartiges Konzept für katalytische asymmetrische 1,3‐dipolare Cycloadditionen mit Iminoestern verwendet modulare polyfunktionelle Lewis‐Säure‐/Azolium‐Aryloxid‐Betain‐Katalysatoren, die die endo‐ und exo‐Selektivität durch Anpassungen des Metallzentrums, des Azoliums und der Sterik steuern. DFT‐Studien zeigen eine nahezu perfekte räumliche Passung
Adrian Bürstner, Patrick M. Becker, Alexander Allgaier, Lucca Pfitzer, Daniel M. Wanner, Johanna Dollinger, Felix Willig, Justin Herrmann, Vukoslava Miskov‐Pajic, Andreas C. Hans, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +13 more
wiley   +1 more source

Copper–phenanthroline catalysts for regioselective synthesis of pyrrolo[3′,4′:3,4]pyrrolo[1,2-a]furoquinolines/phenanthrolines and of pyrrolo[1,2-a]phenanthrolines under mild conditions

Beilstein Journal of Organic Chemistry, 2014
A new series of pyrrolo[3′,4′:3,4]pyrrolo[1,2-a]furoquinolines/phenanthrolines and pyrrolo[1,2-a]phenanthrolines were efficiently built up from an 8-hydroxyquinoline derivative or phenanthroline via 1,3-dipolar cycloaddition reaction involving non ...
Rupankar Paira, Tarique Anwar, Maitreyee Banerjee, Yogesh P. Bharitkar, Shyamal Mondal, Sandip Kundu, Abhijit Hazra, Prakas R. Maulik, Nirup B. Mondal   +8 more
doaj   +1 more source

Synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexane via cyclopropene cycloadditions to the stable azomethine ylide derived from Ruhemann's purple

Beilstein Journal of Organic Chemistry, 2022
A reliable method for the synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexanes through the 1,3-dipolar cycloaddition (1,3-DC) reactions of cyclopropenes to the stable azomethine ylide – protonated form of Ruhemann's purple (PRP) has ...
Alexander S. Filatov, Olesya V. Khoroshilova, Anna G. Larina, Vitali M. Boitsov, Alexander V. Stepakov   +4 more
doaj   +1 more source