Diarylprolinol Ethers: Expanding the Potential of Enamine/Iminium‐Ion Catalysis

Organocatalysts based on diarylprolinol ethers mediate a broad range of reactions involving enamine or iminium-ion activation or a combination of both. The reactions are characterized by efficient steric control of the approach of the respective electrophile/nucleophile to the enamine/iminium-ion counterpart, thus complementing reactions involving hydrogen-bond donors as directing key elements.