Carbene catalyzed umpolung of α,β-enals: a reactivity study of diamino dienols vs. azolium enolates, and the characterization of advanced reaction intermediatesElectronic supplementary information (ESI) available: Experimental procedures, compound characterization data, and X-ray crystallographic data of compounds 4b-Et and 4b-Me. CCDC 1014843 and 1014844. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc01027f
Since their discovery by Bode and Glorius in 2004, N-heterocyclic carbene catalyzed conjugate umpolung reactions of α,β-enals have been postulated to involve the formation of diamino dienols ("homoenolates") and/or azolium enolates ("enolates"), typically followed by addition to...
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