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Total synthesis of morphine and related alkaloids

Laboratory synthesis of natural chemicals

Total synthesis of morphine and related alkaloids

Laboratory synthesis of natural chemicals

Morphine

Synthesis of morphine-like alkaloids in chemistry describes the total synthesis of the natural morphinan class of alkaloids that includes codeine, morphine, oripavine, and thebaine and the closely related semisynthetic analogs methorphan, buprenorphine, hydromorphone, hydrocodone, isocodeine, naltrexone, nalbuphine, oxymorphone, oxycodone, and naloxone.

The structure of morphine is not particularly complex, however the electrostatic polarization of adjacent bonded atoms does not alternate uniformly throughout the structure. This "dissonant connectivity" makes bond formation more difficult and therefore significantly complicates any synthetic strategy that is applied to this family of molecules.

The first morphine total synthesis, devised by Marshall D. Gates, Jr. in 1952 remains a widely used example of total synthesis. This synthesis took a total of 31 steps and proceeded in 0.06% overall yield. The hydrocodone synthesis of Kenner C. Rice is one of the most efficient and proceeds in 30% overall yield in 14 steps. At 9 steps, the Barriault route is the shortest to date, but contains a number of low-yielding steps and is racemic.

Several other syntheses were reported, notably by the research groups of Evans, Fuchs, Parker, Overman, Mulzer-Trauner, White, Taber, Trost, Fukuyama, Guillou, Stork, Magnus, Smith, and Barriault.

Gates synthesis

Gates' total synthesis of morphine provided a proof of the structure of morphine proposed by Robinson in 1925. This synthesis of morphine features one of the first examples of the Diels-Alder reaction in the context of total synthesis.

The Bates synthesis

Rice synthesis

The Rice synthesis follows a biomimetic route and is the most efficient reported to date. A key step is the Grewe cyclization that is analogous to the cyclization of reticuline that occurs in morphine biosynthesis.

The Rice synthesis

References

References

  1. (2011). "Chemistry of Opioids". Topics in Current Chemistry.
  2. (2012). "Alkaloid Synthesis". Topics in Current Chemistry.
  3. (April 1956). "The Synthesis of Morphine". Journal of the American Chemical Society.
  4. Rice KC. (July 1980). "Synthetic opium alkaloids and derivatives. A short total synthesis of (+/-)-dihydrothebainone, (+/-)-dihydrocodeinone, and (+/-)-nordihydrocodeinone as an approach to a practical synthesis of morphine, codeine, and congeners". The Journal of Organic Chemistry.
  5. (2019). "A Nine-Step Formal Synthesis of (±)-Morphine". Organic Letters.
  6. (January 1982). "Studies directed towards the total synthesis of morphine alkaloids". Tetrahedron Letters.
  7. (September 1988). "Studies culminating in the total synthesis of (dl)-morphine". The Journal of Organic Chemistry.
  8. (November 1992). "Convergent synthesis of (+/-)-dihydroisocodeine in 11 steps by the tandem radical cyclization strategy. A formal total synthesis of (+/-)-morphine". Journal of the American Chemical Society.
  9. (November 1993). "Asymmetric synthesis of either enantiomer of opium alkaloids and morphinans. Total synthesis of (−)- and (+)-dihydrocodeinone and (−)- and (+)-morphine". Journal of the American Chemical Society.
  10. (December 1996). "Formal Total Synthesis of(—)-Morphine by Cuprate Conjugate Addition". Angewandte Chemie International Edition in English.
  11. (October 1999). "Asymmetric Total Synthesis of (+)-Codeine via Intramolecular Carbenoid Insertion". The Journal of Organic Chemistry.
  12. (October 2002). "Synthesis of (-)-morphine". Journal of the American Chemical Society.
  13. (December 2002). "Enantioselective synthesis of (-)-codeine and (-)-morphine". Journal of the American Chemical Society.
  14. (November 2006). "Total synthesis of (+/-)-morphine". Organic Letters.
  15. (2008). "Diastereoselective total synthesis of (+/-)-codeine". Chemistry: A European Journal.
  16. (August 2009). "Regiospecific and stereoselective syntheses of (+/-) morphine, codeine, and thebaine via a highly stereocontrolled intramolecular 4 + 2 cycloaddition leading to a phenanthrofuran system". Journal of the American Chemical Society.
  17. (November 2009). "Concise syntheses of (-)-galanthamine and (+/-)-codeine via intramolecular alkylation of a phenol derivative". Journal of the American Chemical Society.
  18. (November 2016). "A Cascade Strategy Enables a Total Synthesis of (±)-Morphine". Angewandte Chemie.
  19. (1925). "Constitution of codeine and thebaine". Memoirs of the Literary and Philosophical Society of Manchester.
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