Synthesis of 1,4,5,6-Tetrahydropyridazine Derivatives via Tandem Annulation of Coumarin Hydrazones and Bench-Stable Allenyl Sulfonium Salt

Key Points

• This research aims to develop a method for synthesizing fused tricyclic structures from coumarin hydrazones.
• Utilized tandem annulation involving coumarin hydrazones and bench-stable allenyl sulfonium salt.
• Conducted under mild conditions with a broad substrate range.
• Achieved excellent functional-group tolerance in the synthesis process.
• Successfully created diverse fused tricyclic structures.