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Related Experiment Videos

Synthesis of (-)-morphine.

Douglass F Taber1, Timothy D Neubert, Arnold L Rheingold

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA. taberdf@udel.edu

Journal of the American Chemical Society
|October 17, 2002
PubMed
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This study details a novel synthesis of (-)-morphine. A key bis-intramolecular cyclization of a keto aldehyde enabled the efficient construction of a tetracyclic intermediate, leading to the target molecule.

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Medicinal Chemistry

Background:

  • (-)-Morphine is a critical opioid analgesic with complex stereochemistry.
  • Efficient and stereoselective synthetic routes to morphine are of significant interest.
  • Previous syntheses often involve numerous steps and challenging stereochemical control.

Purpose of the Study:

  • To develop a novel and efficient synthetic strategy for (-)-morphine.
  • To establish a stereoselective route utilizing key cyclization reactions.
  • To demonstrate the synthesis of diastereomerically and enantiomerically pure intermediates.

Main Methods:

  • Preparation of a diastereomerically pure beta-tetralone ketal.
  • Intramolecular alkylidene C-H insertion and subsequent hydrolysis.

Related Experiment Videos

  • Bis-intramolecular cyclization of a keto aldehyde to form a tetracyclic intermediate.
  • Multi-step conversion of the tetracyclic intermediate to (-)-morphine.

    • Main Results:

    • Successful synthesis of diastereomerically pure beta-tetralone ketal 4.
    • Generation of enantiomerically pure cyclopentene 15 via C-H insertion and hydrolysis.
    • Efficient bis-intramolecular cyclization yielding tetracyclic intermediate 20.
    • Conversion of intermediate 20 to (-)-morphine 1.

    Conclusions:

    • The reported synthetic route provides an effective pathway to (-)-morphine.
    • The key bis-intramolecular cyclization is a powerful tool for constructing complex polycyclic systems.
    • This methodology offers a potentially scalable approach for accessing morphinans.