Bulletin of the Chemical Society of Japan p. 2115 - 2121 (2000)
Update date:2022-08-18
Topics:
Takagi
Manabe
Shiraki
Yoneshige
Hiraga
Kojima
Ohkata
Catalysts, oligo-L-leucine, for the Julia-Colonna asymmetric epoxidation of chalcone with defined degrees of polymerization were prepared by a stepwise elongation method. The yield and enantioselectivity in the epoxidation increased with the degree of polymerization of the catalyst. The presence of an unprotected amine moiety at the N-terminus proved to be essential for high asymmetric induction. The IR characteristic absorption bands (the amide I region) of the catalysts suggested that helical structure in the catalyst is related to asymmetric induction.
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