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HBr-H2O2-Promoted Achmatowicz Rearrangement.

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|February 5, 2026
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This summary is machine-generated.

A new metal-free Achmatowicz rearrangement uses hydrogen bromide and hydrogen peroxide for oxidative ring expansion of furfuryl alcohols. This mild method efficiently produces diverse dihydropyranone scaffolds, valuable in natural product synthesis.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Natural Product Synthesis

Background:

  • The Achmatowicz rearrangement is a key transformation for synthesizing dihydropyranones.
  • Dihydropyranones are crucial structural motifs found in numerous natural products.
  • Existing methods often require harsh conditions or metal catalysts.

Purpose of the Study:

  • To develop a mild, metal-free method for the Achmatowicz rearrangement.
  • To utilize inexpensive and readily available reagents for electrophilic bromination.
  • To provide a versatile route to diverse pyranone scaffolds.

Main Methods:

  • Oxidative ring expansion of furfuryl alcohols.
  • Employing a hydrogen bromide (HBr) and hydrogen peroxide (H2O2) system.
  • Optimization of reaction conditions for broad substrate scope.

Main Results:

  • Successful metal-free Achmatowicz rearrangement achieved.
  • A broad range of primary, secondary, and tertiary furfuryl alcohols were converted.
  • Structurally diverse dihydropyranone products were obtained efficiently.

Conclusions:

  • The HBr-H2O2 system offers a practical and mild alternative for Achmatowicz rearrangement.
  • This method provides efficient access to valuable pyranone scaffolds.
  • The developed protocol is suitable for the synthesis of complex molecules.