Enantioselective preparation of C-ring fragment of cotylenin A via catalytic asymmetric intramolecular cyclopropanation of α-diazo β-keto ester

Kotaro Nagatani, Yunosuke Hoshino, Haruka Tezuka, Masahisa Nakada

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    6 Citations (Scopus)

    Abstract

    A synthetic pathway to the C-ring fragment of cotylenin A which emerged from our retrosynthetic analysis of cotylenin A is described. The catalytic asymmetric intramolecular cyclopropanation (CAIMCP) of the α-diazo-β-keto ester bearing 2,4,6-trimethylphenyl group as the ester part has been found to afford the crystalline product with high ee, which allowed to establish the approach to the C-ring fragment which required ten-pot operations. The developed approach would be beneficial to a large scale synthesis of the C-ring fragment for the total synthesis of cotylenin A.

    Original languageEnglish
    Pages (from-to)959-962
    Number of pages4
    JournalTetrahedron Letters
    Volume58
    Issue number10
    DOIs
    Publication statusPublished - 2017 Mar 8

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    Keywords

    • Asymmetric catalysis
    • Cotylenin A
    • Cyclopropanation
    • Synthetic studies
    • α-diazo β-keto ester

    ASJC Scopus subject areas

    • Biochemistry
    • Drug Discovery
    • Organic Chemistry

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