Fused pyridine derivatives R 0450 A Novel Entry to Cyclopenta[b]quinolines via Thermal Ring-Expansion of (2-Aminophenyl)-ethynyl-SubstitutedSquaric Acid Derivatives. -(ZEHR, P. S.; KAYALI, R.; PENA-CABRERA, E.; ROBLES-RESENDIZ, O.; VILLANUEVA-RENDON, A. D.; SOEDERBERG*, B. C. G.; Tetrahedron 64 (2008) 22, 5336-5344; Dep. Chem., W. Va. Univ., Morgantown, WV 26506, USA; Eng.) -Klein 42-131