• phenols
  • Perkin rearrangement, where a coumarin is reacted with a hydroxide: Diels-Alder reaction of nitro vinyl furans with various dienophiles: Cycloisomerization of alkyne ortho-substituted phenols: Substituted benzofurans Furan, an analog without the fused benzene ring. (wikipedia.org)
  • acid
  • Furanonaphthoquinones, atraric acid and a benzofuran from the stem barks of Newbouldia laevis. (thefreedictionary.com)
  • The direct alkynylation of benzofurans was achieved for the first time using the hypervalent iodine reagent 1-[(triisopropylsilyl)ethynyl]-1,2-benziodoxol-3(1H)-one (TIPS-EBX) based on the cooperative effect between a gold catalyst and a zinc Lewis acid. (epfl.ch)
  • entailed refluxing 3-bromophenol with bromoacetaldehyde and sodium hydride to give the diethyl acetyl, which then was heated with polyphosphoric acid to give a mixture of bromobenzofurans structural isomers: 4-bromo-1-benzofuran and 6-bromo-1-benzofuran. (wikipedia.org)
  • several
  • Pterocarpans, a special kind of isoflavonoids owing two contiguous benzofuran and benzopyran rings, are also known to display several biological activities (Militao et al. (thefreedictionary.com)