Journal
TETRAHEDRON
Volume 72, Issue 22, Pages 2731-2741Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2015.08.052
Keywords
Rhodium; Rhodacyclopentanone; Cycloaddition; N-Heterocycle; Catalysis
Categories
Funding
- EPSRC [EP/G036764/1]
- Syngenta
- Royal Society
- Engineering and Physical Sciences Research Council [981180] Funding Source: researchfish
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Urea-directed carbonylative insertion of Rh(I)-catalysts into one of the two proximal C-C bonds of aminocyclopropanes generates rhodacyclopentanone intermediates. These are trapped by N-tethered alkynes to provide a (3+1+2) cycloaddition protocol that accesses N-heterobicyclic enones. Stoichiometric studies on a series of model rhodacyclopentanone complexes outline key structural features and provide a rationale for the efficacy of urea directing groups. A comprehensive evaluation of cycloaddition scope and a 'second generation' cationic Rh(I)-system, which provides enhanced yields and reaction rates for challenging substrates, are presented. (C) 2015 The Authors. Published by Elsevier Ltd.
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