Synthesis of fluorescent cyclopentene-fused-phenanthrenes via boron trifluoride-promoted cascade cationic cyclization

Key Points

• The aim is to develop a metal-free method for synthesizing cyclopentene-fused phenanthrenes using BF3-promoted cyclization.
• Employ BF3 for cascade cyclization of biaryl-embedded enynones with nitriles
• Use mild conditions for the reaction
• Focus on the formation of amide-functionalized products
• Successfully synthesized amide-functionalized cyclopentene-fused phenanthrenes
• Achieved under mild reaction conditions
• Demonstrated rapid access to desired compounds with high efficiency