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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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2,2'-Bipyridine-Modified Tamoxifen: A Versatile Vector for Molybdacarboranes.

Benedikt Schwarze1, Sanja Jelača2, Linda Welcke1

  • 1Leipzig University, Faculty of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, 04103, Leipzig, Germany.

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|November 3, 2019
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Summary

New molybdacarborane compounds show promise as anticancer agents. These metallacarboranes, combined with a tamoxifen-inspired molecule, exhibit potent cytotoxic activity against various cancer cell lines, including breast and brain cancers.

Keywords:
breast cancermolybdacarboranenanoparticlesnitric oxide (NO)tamoxifen

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Area of Science:

  • Inorganic Chemistry
  • Medicinal Chemistry
  • Cancer Research

Background:

  • Antitumor activity of metallacarboranes is underexplored, with limited studies on ruthena- and molybdacarboranes.
  • Tamoxifen (TAM-diOH) is a well-established drug, providing a basis for designing novel therapeutic agents.

Purpose of the Study:

  • To synthesize and evaluate the antitumor potential of a novel molybdacarborane derivative linked to a tamoxifen-inspired moiety.
  • To investigate the cytotoxic effects and cellular mechanisms of the synthesized compounds against various cancer cell lines.

Main Methods:

  • Synthesis of a molybdacarborane derivative ([3,3-{4-[1,1-bis(4-hydroxyphenyl)but-1-en-2-yl]-2,2'-bipyridine-κ2 N,N'}-3-(CO)2 -closo-3,1,2-MoC2 B9 H11 ] (10)) and its ligand (4-[1,1-bis(4-hydroxyphenyl)but-1-en-2-yl]-2,2'-bipyridine (6)).
  • Assessment of cytotoxic activities against breast adenocarcinoma (MDA-MB-231, MDA-MB-361, MCF-7), human glioblastoma (LN-229), and human glioma (U-251) cell lines.
  • Evaluation of compound-induced senescence, autophagy, reactive oxygen/nitrogen species (ROS/RNS) levels, and nitric oxide (NO) production.

Main Results:

  • Compounds 6 and 10 demonstrated cytotoxic effects in the low micromolar range against all tested cancer cell lines.
  • Both compounds induced senescence and cytodestructive autophagy.
  • Compounds 6 and 10 reduced ROS/RNS levels, while compound 10 significantly increased nitric oxide (NO) concentration in MCF-7 cells.

Conclusions:

  • The novel molybdacarborane derivative (10) and its ligand (6) exhibit significant cytotoxic and antiproliferative activities.
  • These compounds represent a promising new class of metallacarboranes for cancer therapy, with distinct mechanisms of action including induction of senescence and autophagy.
  • Further investigation into the therapeutic potential of these compounds is warranted.