Lewis Acid Catalyzed Diastereoselective Vinylogous Mannich Reaction Induced by O-Pivaloylated d-Galactosylamine as the Chiral Auxiliary: Stereoselective Synthesis of 6-Arylpiperidin-2-ones - Cui, Bing; Kong, Shasha; Wu, Guiping; Miao, Zhiwei; Chen, Ruyu (Synthesis, 2012)