Enantioselective 1,3-Dipolar Cycloaddition Reactions between Nitrones and α-Substituted α,β-Unsaturated Aldehydes Catalyzed by Chiral Cationic Cobalt(III) Complexes - Ohtsuki, Natsuki; Kezuka, Satoko; Kogami, Youichi; Mita, Tsuyoshi; Ashizawa, Tomoko; Ikeno, Taketo; Yamada, Tohru (Synthesis, 2003)