Synthetic Strategy Studies for a Concise Access to Functionalized Pyrano[4,3‐
<i>b</i>
]pyridin‐7‐ones: An Entry to Semi‐Rigid Analogs of Antihistamines
Original pyranopyridinones containing polyfunctionalized delta‐lactonesring have been synthesized using three concise and efficientsynthetic methodologies. Potential semi‐rigid analogs of antihistamines containing a pyranopyridinone scaffold have also been prepared using the outlined synthetic methodologies.