The reactivity of various α-diazocarbonyl piperidine scaffolds, characterised by an increased molecular complexity, was tested with various Rh(II) catalysts. The structure of the starting reagent is of relevance to the synthetic results. An unexpected dimerisation took place, starting from the simple piperidine scaffold, to give the hexahydrotetrazine ring system. Products derived from a nitrogen ylide intermediate or aromatic substitution (1,3,4,5-tetrahydro-2,5-methanobenzo[c]azepine and 1,2,3,3a-tetrahydrocyclopenta[de]isoquinolin-4(5 H)-one rings, respectively) were obtained from tetrahydroisoquinoline derivatives. The chemoselectivity of the reaction could be controlled by the choice of starting reagent, Rh(II) catalyst and the reaction conditions. Finally, it was found that the azepino heterocycle could coordinate to the catalyst to give new Rh(II) complexes.
Unusual Chemoselective Rh(II) -Catalysed Transformations of α-Diazocarbonyl Piperidine Cores / A. Bonetti, E. Beccalli, A. Caselli, F. Clerici, S. Pellegrino, M.L. Gelmi. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 21:4(2015), pp. 1692-1703.
|Titolo:||Unusual Chemoselective Rh(II) -Catalysed Transformations of α-Diazocarbonyl Piperidine Cores|
BONETTI, ANDREA (Primo)
BECCALLI, EGLE MARIA (Secondo)
PELLEGRINO, SARA (Penultimo)
GELMI, MARIA LUISA (Ultimo)
|Parole Chiave:||catalysis; chemoselective reactions; hexahydrotetrazines; rhodium; α-diazocarbonyl piperidines|
|Settore Scientifico Disciplinare:||Settore CHIM/06 - Chimica Organica|
|Data di pubblicazione:||2015|
|Data ahead of print / Data di stampa:||19-nov-2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/chem.201405197|
|Appare nelle tipologie:||01 - Articolo su periodico|