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Intramolecular [2+2+2] cycloaddition reactions of Yne-ene-yne and Yne-yne-ene enediynes catalysed by Rh I: Experimental and theoretical mechanistic studies

N-Tosyl-linked open-chain yne-ene-yne enediynes 1 and 2 and yne-yne-ene enediynes 3 and 4 have been satisfactorily synthesised. The [2+2+2] cycloaddition process catalysed by the Wilkinson catalyst [RhCl(PPh 3) 3] was tested with the above-mentioned substrates resulting in the production of high yields of the cycloadducts. Enediynes 1 and 2 gave standard [2+2+2] cycloaddition reactions whereas enediynes 3 and 4 suffered β-hydride elimination followed by reductive elimination of the Wilkinson catalyst to give cycloadducts, which are isomers of those that would be obtained by standard [2+2+2] cycloaddition reactions. The different reactivities of these two types of enediyne have been rationalised by density functional theory calculations

Financial support from the Spanish MICINN (CTQ2008-05409-C02-02, CTQ2008-03077, CTQ2011-23156, CTQ2011-23121 and CTQ2009-08328) and the Catalan DIUE of the Generalitat de Catalunya (2009SGR637) is acknowledged. A. D. thanks the Spanish MEC for a doctoral fellowship. Support for the research of M. S. was received through the ICREA Academia 2009 prize for excellence in research funded by the DIUE

© Chemistry - A European Journal, 2011, vol. 17, núm. 51, p. 14493-14507

Wiley-VCH Verlag

Manager: Ministerio de Ciencia e Innovación (Espanya)
Ministerio de Educación y Ciencia (Espanya)
Generalitat de Catalunya. Agència de Gestió d’Ajuts Universitaris i de Recerca
Author: Dachs Soler, Anna
Pla i Quintana, Anna
Parella Coll, Teodor
Solà i Puig, Miquel
Roglans i Ribas, Anna
Date: 2011 December
Abstract: N-Tosyl-linked open-chain yne-ene-yne enediynes 1 and 2 and yne-yne-ene enediynes 3 and 4 have been satisfactorily synthesised. The [2+2+2] cycloaddition process catalysed by the Wilkinson catalyst [RhCl(PPh 3) 3] was tested with the above-mentioned substrates resulting in the production of high yields of the cycloadducts. Enediynes 1 and 2 gave standard [2+2+2] cycloaddition reactions whereas enediynes 3 and 4 suffered β-hydride elimination followed by reductive elimination of the Wilkinson catalyst to give cycloadducts, which are isomers of those that would be obtained by standard [2+2+2] cycloaddition reactions. The different reactivities of these two types of enediyne have been rationalised by density functional theory calculations
Financial support from the Spanish MICINN (CTQ2008-05409-C02-02, CTQ2008-03077, CTQ2011-23156, CTQ2011-23121 and CTQ2009-08328) and the Catalan DIUE of the Generalitat de Catalunya (2009SGR637) is acknowledged. A. D. thanks the Spanish MEC for a doctoral fellowship. Support for the research of M. S. was received through the ICREA Academia 2009 prize for excellence in research funded by the DIUE
Format: application/pdf
Citation: 015610
ISSN: 0947-6539 (versió paper)
1521-3765 (versió electrònica)
Document access: http://hdl.handle.net/10256/11346
Language: eng
Publisher: Wiley-VCH Verlag
Collection: MICINN/PN 2012-2014/CTQ2011-23121
MEC/PN 2009-2011/CTQ2008-03077/BQU
MEC/PN 2009-2011/CTQ2008-05409-C02-02
MICINN/PN 2012-2014/CTQ2011-23156
AGAUR/2009-2014/2009 SGR-637
Reproducció digital del document publicat a: http://dx.doi.org/10.1002/chem.201102210
Articles publicats (D-Q)
Is part of: © Chemistry - A European Journal, 2011, vol. 17, núm. 51, p. 14493-14507
Rights: Tots els drets reservats
Subject: Reaccions d’addició
Addition reactions
Funcional de densitat, Teoria del
Density functionals
Mecanismes de reacció (Química)
Reaction mechanisms (Chemistry)
Rodi
Rhodium
Ciclització (Química)
Ring formation (Chemistry)
Title: Intramolecular [2+2+2] cycloaddition reactions of Yne-ene-yne and Yne-yne-ene enediynes catalysed by Rh I: Experimental and theoretical mechanistic studies
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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