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Asymmetric Synthesis of α,α-Disubstituted α-Amino Acids via Enantioselective Alkylation of Azlactones under Biphasic Conditions Using P-Spiro Chiral Tetraaminophosphonium Salts as a Phase-Transfer Catalyst

Daisuke Uraguchi, Yoshihiro Asai, Yuki Seto, Takashi Ooi*
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603 Japan
Fax: +81(52)7893338; e-Mail: tooi@apchem.nagoya-u.ac.jp;