Synthesis and Transformation of 5-Acetyl-2-aryl-6-hydroxybenzofurans into Furanoflavanone Derivatives

Abstract

Tandem palladium-catalyzed Sonogashira cross-coupling and heteroannulation of 3-bromo-2,4-dihydroxy-5-iodoacetophenone with arylacetylenes followed by the base-mediated Claisen–Schmidt aldol condensation of the intermediate 5-acetyl-2-aryl-7-bromo-6-hydroxybenzofurans with benzaldehyde derivatives afforded the corresponding linear 2-arylbenzofuranchalcone hybrids. The presence of the o-hydroxy-trans-α,β-unsaturated carbonyl moiety in the prepared furanochalcone hybrids facilitated acid-mediated cycloisomerization into the corresponding linear furanoflavanones. The structures of the prepared compounds were confirmed using a combination of spectrometric techniques complemented with single crystal XRD analysis.

Keywords

3-bromo-2,4-dihydroxy-5-iodoacetophenone - Sonogashira cross-coupling - furanochalcones - furanoflavanones - X-ray

• References

• 1 On research leave from Obafemi Awolowo University, Ile-Ife, Osun state, Nigeria.
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