Synthesis of α,α-Disubstituted α-Amino Acid Derivatives in Enantiopure Form via Stereoselective Addition of Grignard Reagents to a Chiral Acyclic Nitrone Derived from l-Erythrulose - Portolés, Raul; Murga, Juan; Falomir, Eva; Carda, Miguel; Uriel, Santiago; Marco, J Alberto (Synlett, 2002)