Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 4, Pages 1692-1703Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405197
Keywords
catalysis; chemoselective reactions; hexahydrotetrazines; rhodium; alpha-diazocarbonyl piperidines
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Funding
- Ministero dell'Universita e della Ricerca (MIUR) (PRIN) [20109Z2XRJ]
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The reactivity of various alpha-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(5H)-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.
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