Ynones as Versatile Electrophiles for the Divergent Synthesis of 4H-Chromenes and 1,4-Dihydroquinolines

Key Points

• The aim is to develop an efficient method for synthesizing 4H-chromenes and 1,4-dihydroquinolines without transition metals.
• Utilized 2-hydroxy/2-amino chalcones and ynones as key reagents.
• Employed a sequential reaction process for synthesis.
• Focused on a transition-metal-free catalytic approach.
• Successfully synthesized 4H-chromenes and 1,4-dihydroquinolines.
• Demonstrated high efficiency in the reaction process.
• Showed versatility of ynones as electrophiles in various transformations.