Highly Diastereoselective Synthesis of 3-Indolyl-N-Substituted Glycine Derivatives via TFA-Promoted Friedel-Crafts Type Reaction of Indoles with Chiral Cyclic Glyoxylate Imine - Lei, Fei; Chen, Yong-Jun; Sui, Yong; Liu, Li; Wang, Dong (Synlett, 2003)