Preparation of new nitrogen-bridged heterocycles. 37. Synthesis and rearrangement of full-conjugated oxepino[2,3-b]indolizine derivatives

Article abstract of DOI:10.1246/bcsj.67.2795

The title compounds were first synthesized in considerably good yields by acid-catalyzed dehydration of the corresponding ethyl 2-arylcarbonyl-3-hydroxy-3-phenyl-2,3-dihydrooxepino[2,3-b]indolizin-4- carboxylate derivatives with methanesulfonic acid in bo