Algar–Flynn–Oyamada reaction

Chemical reaction producing flavonol From Wikipedia, the free encyclopedia

The Algar–Flynn–Oyamada reaction is a chemical reaction whereby a chalcone undergoes an oxidative cyclization to form a flavonol.[1][2]

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The Algar–Flynn–Oyamada reaction

Reaction mechanism

There are several possible mechanisms to explain this reaction; however, these reaction mechanisms have not been elucidated. What is known is that a two-stage mechanism exists. First, dihydroflavonol is formed, which then subsequently oxidizes to form a flavonol.

Proposed mechanisms involving epoxidation of the alkene have been disproven.[3]

The probable mechanisms are thus two possibilities:

  • The phenoxide attacks the enone at the beta position, and the alkene directly attacks hydrogen peroxide from the alpha position, forming the dihydroflavonol.
  • The phenoxide attacks the enone at the beta position, closing the six-membered ring and forming an enolate intermediate. The enolate then attacks hydrogen peroxide, forming the dihydroflavonol.
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Possible mechanisms

See also

References

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