Pd/C-Catalyzed Direct α-Oxygenation of 1,3-Dicarbonyl Compounds Using Molecular Oxygen - Monguchi, Yasunari; Takahashi, Tohru; Iida, Yusuke; Fujiwara, Yuta; Inagaki, Yuya; Maegawa, Tomohiro; Sajiki, Hironao (Synlett, 2008)