Fused ring systems, containing two or three five-membered rings, were constructed by utilizing 1-(cyclopent-1-enylcarbonyl)vinylphosphonates which function as versatile annulating reagents.
T. Minami, M. Nakayama, K. Fujimoto and S. Matsuo, J. Chem. Soc., Chem. Commun., 1992, 190 DOI: 10.1039/C39920000190
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