Intriguing imidazolidinones! Inspired by noncovalentinteractions in proteins, a series of electronically distinct MacMillancatalysts were designed. The effect of electronic modulation on ground state conformation, reactivity, and performance was studied in a catalytic setting with intriguing outcomes.
Aromatic Interactions in Organocatalyst Design: Augmenting Selectivity Reversal in Iminium Ion Activation
作者:Mareike C. Holland、Jan Benedikt Metternich、Constantin Daniliuc、W. Bernd Schweizer、Ryan Gilmour
DOI:10.1002/chem.201500270
日期:2015.7.6
that intermolecular aromatic (CH–π and cation–π) interactions between the incipient iminium cation and the indole ring system is key to rationalising selectivityreversal. This is absent in the N‐methylpyrrole alkylation, thus forming the basis of two competing enantio‐induction pathways. A simple L‐valine catalyst has been developed that significantly augments this interaction.