Ring expansion of benzocyclobutenols toward benzo b furans

Key Points

• The central aim is to develop an efficient method for ring expansion from benzocyclobutenols to benzo[b]furans.
• Utilized aryne intermediates for ring expansion
• Conducted oxyiodination of benzocyclobutenols
• Prepared a variety of iodo-substituted benzo[b]furans
• Successfully achieved ring expansion from 4 to 5 members
• Synthesized multiple iodo-substituted benzo[b]furans
• Showed high transformation efficiency in the reaction process