Enantiodivergent [4+2] Cycloaddition of Dienolates by Polyfunctional Lewis Acid/Zwitterion Catalysis
作者:Vukoslava Miskov‐Pajic、Felix Willig、Daniel M. Wanner、Wolfgang Frey、René Peters
DOI:10.1002/anie.202009093
日期:2020.11.2
Different catalysis concepts have been reported, including dienophile activation by Lewis acids or H‐bond donors and diene activation by bases. Herein we report a new concept, in which an acidic prodiene is acidified by a Lewis acid to facilitate deprotonation by an imidazolium–aryloxide entity within a polyfunctional catalyst. A metal dienolate is thus formed, while an imidazolium–ArOH moiety probably
An asymmetric synthesis of the key intermediate of RPR107880, a substancePantagonist, using a base-catalyzed Diels–Alder reaction of 3-hydroxy-2-pyrone and N-benzylmaleimide is described.