The Proline-Catalyzed Double Mannich Reaction of Acetaldehyde with<i>N</i>-Boc Imines
作者:Carley Chandler、Patrizia Galzerano、Anna Michrowska、Benjamin List
DOI:10.1002/anie.200806049
日期:2009.3.2
Double‐cross: Proline catalyzes the doubleMannichreaction of acetaldehyde with N‐Boc imines in excellent yields (up to 99 %; Boc=tert‐butoxycarbonyl) and close to perfect diastereo‐ and enantioselectivities. Depending on the choice of catalysts, both the chiral, pseudo‐C2‐symmetric diastereomer and the corresponding meso compound can be prepared. Cross doubleMannichreactions of acetaldehyde with