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■ Synthesis of Chiral Tropopodands Having L-Amino Acid Moieties and Ability of Their Metal Complexes as an Asymmetric Catalyst

Ohki Sato,* Yusuke Koshiba, Satoshi Sagara, and Katsuyoshi Okada

*Department of Chemistry, Faculty of Science, Saitama University, Urawa, Saitama 338-8570, Japan

Abstract

Optical active tropopodands (10 and 11) having neutral L-amino acids and L-histidine moieties were synthesized. Within their metal complexes, Pd complexes of histidine-tropopodands (11b and 11c) bearing bulky amide moieties showed good ability as an asymmetric catalyst in conjugate addition.