Catalytic Direct Asymmetric Michael Reactions: Addition of Unmodified Ketone and Aldehyde Donors to Alkylidene Malonates and Nitro Olefins - Betancort, Juan M; Sakthivel, Kandasamy; Thayumanavan, Rajeswari; Tanaka, Fujie; Barbas III, Carlos F (Synthesis, 2004)