developed and used as recyclablecatalysts for the aza-Michael addition at room temperature without any organic solvent. [DABCO–PDO][OAc] was found to be the most efficientcatalyst, and the amount of catalyst was only 10 mol %. Various amines reacted with a wide range of α,β-unsaturated amides, smoothly affording target products in good to excellent yields within hours. Moreover, the catalyst could be reused
Ionic tagged DABCO grafted on magnetic nanoparticles: a water-compatible catalyst for the aqueous aza-Michael addition of amines to α,β-unsaturated amides
Direct π‐Activation vs.
<i>O</i>
‐Activation in Halogen‐Bonding Catalysis
作者:Raphaël Robidas、Claude Y. Legault
DOI:10.1002/anie.202301190
日期:——
HalogenBond (XB) donors are under active development in organocatalysis. In analogy to Hydrogen Bond (HB) donors, they have been considered to activate most organic substrates through the O-complexation of carbonyl groups. Our results suggest that direct π-activation (i.e., of the π-bond involved in the reaction) can be dominant in many cases of XB catalysis, largely altering our view on this type