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Related Concept Videos

Pharmaceutical Equivalents01:26

Pharmaceutical Equivalents

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As defined by regulatory standards, pharmaceutical equivalents require generic drug products to have identical dosage forms and chemically identical active pharmaceutical ingredients (APIs). They must adhere to compendial or applicable standards for potency, content uniformity, disintegration times, and dissolution rates. In the case of modified-release dosage forms, variations in drug content are permissible as long as the delivered amount remains consistent with the innovator drug product.
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Pharmaceutical diversification via palladium oxidative addition complexes.

Mycah R Uehling1,2, Ryan P King2, Shane W Krska1

  • 1Merck & Co. Inc., Kenilworth, NJ 07033, USA.

Science (New York, N.Y.)
|January 26, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed stable palladium oxidative addition complexes (OACs) for efficient cross-coupling reactions. These OACs offer milder conditions and higher success rates than traditional catalytic methods, simplifying complex molecule synthesis.

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Area of Science:

  • Synthetic Organic Chemistry
  • Medicinal Chemistry
  • Materials Science

Background:

  • Palladium-catalyzed cross-coupling reactions are vital for discovering new materials and medicines.
  • Synthesizing densely functionalized molecules via cross-coupling remains challenging.
  • Existing catalytic methods often require harsh conditions or specific substrate compatibility.

Purpose of the Study:

  • To develop an alternative strategy for cross-coupling reactions using stable palladium complexes.
  • To overcome limitations associated with traditional palladium-catalyzed cross-coupling.
  • To demonstrate the broad utility of this new approach in complex molecule synthesis.

Main Methods:

  • Utilized stoichiometric quantities of palladium oxidative addition complexes (OACs) derived from drug-like aryl halides.
  • Performed cross-coupling reactions under mild, ambient conditions.
  • Tested OAC stability through prolonged benchtop storage.

Main Results:

  • Cross-coupling reactions using OACs generally proceeded under milder conditions with higher success rates compared to catalytic methods.
  • OACs demonstrated remarkable stability, retaining reactivity after months of storage.
  • Successfully applied OACs in automated nanomole-scale couplings and late-stage natural product derivatization.

Conclusions:

  • Palladium oxidative addition complexes offer a robust and efficient alternative to traditional cross-coupling catalysis.
  • The stability and reactivity of OACs enable new possibilities in chemical synthesis, including complex drug discovery and modification.
  • This approach simplifies the synthesis of functional molecules and expands the scope of accessible chemical space.