Synthesis 2015; 47(15): 2256-2264
DOI: 10.1055/s-0034-1380702
special topic
© Georg Thieme Verlag Stuttgart · New York

Cyclic Model for the Asymmetric Conjugate Addition of Organolithiums with Enoates

Katsumi Nishimura
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
,
Naoshi Fukuyama
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
,
Mitsuaki Yamashita
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
,
Takaaki Sumiyoshi
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
,
Yasutomo Yamamoto
b   Faculty of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kodo, Kyotanabe 610-0395, Japan   eMail: ktomioka@dwc.doshisha.ac.jp
,
Ken-ichi Yamada
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
,
Kiyoshi Tomioka*
a   Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
b   Faculty of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kodo, Kyotanabe 610-0395, Japan   eMail: ktomioka@dwc.doshisha.ac.jp
› Institutsangaben
Weitere Informationen

Publikationsverlauf

Received: 14. März 2015

Accepted after revision: 13. April 2015

Publikationsdatum:
19. Mai 2015 (online)


Abstract

The chiral diether ligand controlled asymmetric conjugate addition of organolithiums to nona-2,7-dienedioates preferentially proceeds via the s-cis conformation with coordination of the carbonyl oxygen atom to the lithium to give a lithium E-enolate intermediate. Subsequent intramolecular conjugate addition of the enolate also proceeds via a cyclic transition state involving the lithium and the s-cis-enoate, resulting in trans,trans-trisubstituted cyclohexanes with high enantiomeric excesses and yields.

Supporting Information