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2005
Fused pyridine derivatives
R 0450
A Unified Approach to Quinolizinium Cations and Related Systems by Ring-ClosMetathesis. — The first example of a RCM process involving heteroaromatic cat07- 134 ing
ions and cationic interconversion (azinium to quinolizinium) allows the preparation of
a variety of heteroaromatic cations, including dihydroquinolizinium and pyridoisoquinolinium, -quinolinium, -azepinylium, and -azocinylium. The products are obtained
in good overall yield from readily available starting materials. The RCM reaction affording higher-membered ring systems is only successful when the reaction is carried
out at high dilution (0.005 M). — (NUNEZ, A.; CUADRO*, A. M.;
ALVAREZ-BUILLA, J.; VAQUERO*, J. J.; Org. Lett. 6 (2004) 22, 4125-4127; Dep.
Quim. Org., Univ. Alcala, E-28871 Alcala de Henares, Madrid, Spain; Eng.) —
Steudel
2005
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