1. J Org Chem. 1999 Mar 5;64(5):1705-1708. Asymmetric Syntheses of Derivatives of beta- and gamma-Aryl and alpha-Alkyl Amino Acids Using n-BuLi/(-)-Sparteine. Kim BJ(1), Park YS, Beak P. Author information: (1)Department of Chemistry, University of Illinois at Urbana ...