Cyclopenta[a]quinolizine: A Novel Pseudoazulene with a Bridgehead Nitrogen Atom

[摘要]：Cyclopenta[a]quinolizine, a novel tricyclic pseudoazulene, was prepared by reaction of cyclopentadienyllithium with oxazolo[3,2-a]pyridinium or substituted pyridinium salts Structural analysis (X-ray analysis, NMR and UV spectroscopy) and DFT calculations confirm its highly dipolar nature (due to delocalization of the negative charge around the five-membered ring) combined with partial localization of bonds in both six-membered rings

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