Synthesis of the KLMN Fragment of Gymnocin-A Using Oxiranyl Anion Convergent Methodology
摘要:
Synthesis of the KLMN fragment of gymnocin-A has been achieved by a [X + 2 + Y]-type convergent strategy involving the coupling of a K-ring triflate and an N-ring epoxy sulfone. Fusions of the L ring and the M ring were carried out by intramolecular S(N)2 substitution of a tertiary alcohol and reductive etherification to furnish the target molecule.
Synthesis of the KLMN Fragment of Gymnocin-A Using Oxiranyl Anion Convergent Methodology
摘要:
Synthesis of the KLMN fragment of gymnocin-A has been achieved by a [X + 2 + Y]-type convergent strategy involving the coupling of a K-ring triflate and an N-ring epoxy sulfone. Fusions of the L ring and the M ring were carried out by intramolecular S(N)2 substitution of a tertiary alcohol and reductive etherification to furnish the target molecule.
作者:Takeo Sakai、Shingo Matsushita、Shogo Arakawa、Koichi Mori、Miki Tanimoto、Akihiro Tokumasu、Tatsuji Yoshida、Yuji Mori
DOI:10.1021/jacs.5b10082
日期:2015.11.18
A convergent totalsynthesis of cytotoxic marine natural polycyclicether, gymnocin-A (1), is described. The synthesis features three iterations of an oxiranyl anion strategy, involving base-mediated cycloetherification, ring expansion, and reductive etherification, for the construction of the FGH fragment and for its coupling with the ABC and KLMN fragments.