Search results for: Silvia Reboredo

Items from 1 to 8 out of 8 results

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Cyclobuteno[60]fullerenes as Efficient n‐Type Organic Semiconductors

Silvia Reboredo, Rosa M. Girón, Salvatore Filippone, Tsubasa Mikie, more

Chemistry – A European Journal > 22 > 38 > 13627 - 13631

Cyclobuteno[3,4:1,2][60]fullerenes have been prepared in a straightforward manner by a simple reaction between [60]fullerene and readily available allenoates or alkynoates as organic reagents under basic and mild conditions. The chemical structure of the new modified fullerenes has been determined by standard spectroscopic techniques and confirmed by X‐ray diffraction analysis. Some of these new fullerene...

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Chiral Hypervalent Iodine Reagents: Synthesis and Reactivity

Alejandro Parra, Silvia Reboredo

Chemistry – A European Journal > 19 > 51 > 17244 - 17260

Chiral hypervalent iodine chemistry has been steadily increasing in importance in recent years. This review catalogues enantioselective transformations triggered by chiral hypervalent iodine(III/V) reagents, in stoichiometric or catalytic quantities, highlighting the different reactivities in terms of yield and enantioselectivity. Moreover, the synthesis of the most remarkable and successful catalysts...

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Asymmetric Organocatalysis in Fullerenes Chemistry: Enantioselective Phosphine‐catalyzed Cycloaddition of Allenoates onto C₆₀

Juan Marco‐Martínez, Vanesa Marcos, Silvia Reboredo, Salvatore Filippone, more

Angewandte Chemie International Edition > 52 > 19 > 5115 - 5119

Organocatalysis and fullerenes merge: The first asymmetric organocatalytic synthesis by phosphine‐catalyzed [3+2] cycloaddition of allenoates onto [60]fullerene that occurs under mild conditions giving rise to enantiomerically pure carbocyclic fullerene derivatives is reported. X‐ray analysis of a cyclopenteno[60]fullerene has allowed the assignment of the absolute configuration of the new stereocenter...

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Asymmetric Organocatalysis in Fullerenes Chemistry: Enantioselective Phosphine‐catalyzed Cycloaddition of Allenoates onto C₆₀

Juan Marco‐Martínez, Vanesa Marcos, Silvia Reboredo, Salvatore Filippone, more

Angewandte Chemie > 125 > 19 > 5219 - 5223

Organokatalyse trifft auf Fullerene: Die erste asymmetrische organokatalytische [3+2]‐Cycloaddition von Allenoaten an [60]Fulleren läuft unter milden Bedingungen ab und ergibt enantiomerenreine carbocyclische Fullerenderivate. Mittels Röntgenstrukturanalyse eines Cyclopenteno[60]fullerens konnte die absolute Konfiguration des neuen Stereozentrums bestimmt werden. Die Sektor‐Regel, die bisher zur Chiralitätszuordnung...

article

Trienamines: Their Key Role in Extended Organocatalysis for Diels-Alder Reactions

Silvia Reboredo, Alejandro Parra, José Alemán

Asymmetric Catalysis > 2013 > 1 > 1

Activation via trienamine intermediates is a synthetically useful protocol for performing asymmetric Diels-Alder reactions controlled by a remote chiral catalyst (a secondary or primary amine). Key features underpinning this concept are the conformation towards the trienamine formation and also the use of highly electrophilic dienophiles. This cycloaddition reaction allows the application of asymmetric...

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Asymmetrische Synthese von Cyclobutanen über eine formale, durch Dienaminkatalyse kontrollierte [2+2]‐Cycloaddition

Alejandro Parra, Silvia Reboredo, José Alemán

Angewandte Chemie > 124 > 39 > 9872 - 9874

Abgefangen: Eine Kombination von Aminkatalyse und Aktivierung durch Wasserstoffbrücken findet Anwendung in zwei neuen Methoden, um die mit enantioselektiven organokatalysierten formalen [2+2]‐Cycloadditionen verbundenen Probleme durch eine kooperative Katalyse zu lösen. Diese beiden neuen Reaktionen werden Möglichkeiten eröffnen, entsprechende Reaktivitäten auch bei anderen organokatalytischen Cycloadditionen...

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Asymmetric Synthesis of Cyclobutanes by a Formal [2+2] Cycloaddition Controlled by Dienamine Catalysis

Alejandro Parra, Silvia Reboredo, José Alemán

Angewandte Chemie International Edition > 51 > 39 > 9734 - 9736

Trap it: A combination of aminocatalysis with H‐bonding activation is used in two new approaches to carry out formal enantioselective organocatalyzed [2+2] cycloaddition reactions. This cooperative catalysis solves the inconveniences associated with this transformation. These two new reactions will open opportunities to find reactivities involving other organocatalytic cycloadditions.

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An Amine‐Catalyzed Enantioselective [3+2] Cycloaddition of Azomethine Ylides and α,β‐Unsaturated Aldehydes: Applications and Mechanistic Implications

Silvia Reboredo, Efraím Reyes, Jose L. Vicario, Dolores Badía, more

Chemistry – A European Journal > 18 > 23 > 7179 - 7188

The catalytic enantioselective [3+2] cycloaddition between azomethine ylides and α,β‐unsaturated aldehydes catalyzed by α,α‐diphenylprolinol has been studied in detail. In particular, the reaction has been extended to the use of 2‐alkenylidene aminomalonates generated in situ as azomethine ylide precursors. These reactions lead to the formation of pyrrolidines containing a 5‐alkenyl side chain with...

INFONA - science communication portal

Search results for: Silvia Reboredo

Cyclobuteno[60]fullerenes as Efficient n‐Type Organic Semiconductors

Chiral Hypervalent Iodine Reagents: Synthesis and Reactivity

Asymmetric Organocatalysis in Fullerenes Chemistry: Enantioselective Phosphine‐catalyzed Cycloaddition of Allenoates onto C₆₀

Asymmetric Organocatalysis in Fullerenes Chemistry: Enantioselective Phosphine‐catalyzed Cycloaddition of Allenoates onto C₆₀

Trienamines: Their Key Role in Extended Organocatalysis for Diels-Alder Reactions

Asymmetrische Synthese von Cyclobutanen über eine formale, durch Dienaminkatalyse kontrollierte [2+2]‐Cycloaddition

Asymmetric Synthesis of Cyclobutanes by a Formal [2+2] Cycloaddition Controlled by Dienamine Catalysis

An Amine‐Catalyzed Enantioselective [3+2] Cycloaddition of Azomethine Ylides and α,β‐Unsaturated Aldehydes: Applications and Mechanistic Implications

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