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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Updated: Dec 30, 2025

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

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Programmable meroterpene synthesis.

Xingyu Shen1, Chi P Ting1, Gong Xu1

  • 1Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, CA, 94702, USA.

Nature Communications
|January 26, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a 10-step synthesis for bicyclo[3.3.1]nonane natural products, including garsubellin A. This strategy enables programmable synthesis of diverse meroterpene chemotypes for potential therapeutic applications.

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Area of Science:

  • Organic Chemistry
  • Natural Product Synthesis
  • Medicinal Chemistry

Background:

  • The bicyclo[3.3.1]nonane core is prevalent in over 1000 natural products, exhibiting bioactivity against neurodegenerative diseases, infections, and cancer.
  • Meroterpenes, natural products of mixed polyketide/terpenoid origin, are a significant source of bicyclo[3.3.1]nonane-containing compounds.

Purpose of the Study:

  • To establish a general synthetic strategy for accessing bicyclo[3.3.1]nonane-containing natural products.
  • To achieve the total synthesis of garsubellin A, a known enhancer of choline acetyltransferase.

Main Methods:

  • Development of an abiotic annulation/rearrangement strategy.
  • A 10-step total synthesis of garsubellin A was executed.
  • Demonstration of a programmable assembly process for diverse meroterpene chemotypes.

Main Results:

  • Successful 10-step total synthesis of garsubellin A.
  • Validation of a versatile synthetic strategy for bicyclo[3.3.1]nonane derivatives.
  • The strategy allows for the creation of multiple, diverse meroterpene chemotypes.

Conclusions:

  • The developed synthetic strategy provides efficient access to the bicyclo[3.3.1]nonane scaffold.
  • This approach facilitates the synthesis of biologically relevant meroterpenes.
  • The programmable assembly offers a pathway to novel therapeutic agents.