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A reductive coupling strategy towards ripostatin A.

Kristin D Schleicher1, Timothy F Jamison

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, United States.

Beilstein Journal of Organic Chemistry
|August 16, 2013
PubMed
Summary
This summary is machine-generated.

Researchers synthesized key fragments of the antibiotic ripostatin A using nickel(0)-catalyzed coupling and aldol reactions. This study advances the total synthesis of ripostatin A, a complex natural product with potential therapeutic applications.

Keywords:
catalysisnatural productnickelreductive couplingripostatin Asynthesis

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Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis
  • Medicinal Chemistry

Background:

  • Ripostatin A is a complex antibiotic natural product.
  • Total synthesis provides access to novel analogs and enables biological evaluation.
  • Efficient synthetic routes are crucial for complex molecule synthesis.

Purpose of the Study:

  • To develop synthetic strategies for constructing the ripostatin A core structure.
  • To explore nickel(0)-catalyzed coupling for C9-C10 bond formation.
  • To synthesize key fragments for the total synthesis of ripostatin A.

Main Methods:

  • Nickel(0)-catalyzed coupling of enyne and epoxide fragments.
  • Synthesis of a C1-C9 cyclopropyl enyne fragment.
  • Development of strategies for the C10-C26 epoxide fragment, including stereocenter installation and C15-C16 bond formation via aldol reaction.

Main Results:

  • A C1-C9 enyne fragment was synthesized and shown to be a competent substrate for nickel(0)-catalyzed coupling.
  • Synthetic approaches toward the C10-C26 epoxide fragment were explored.
  • Key stereocenters and bonds were constructed using stereoselective reactions.

Conclusions:

  • The study demonstrates a viable strategy for constructing the C9-C10 bond using nickel(0)-catalyzed coupling.
  • Progress was made in synthesizing key fragments for the total synthesis of ripostatin A.
  • The developed methods offer potential for accessing ripostatin A and its analogs.