1156498-61-1Relevant articles and documents
Ring-closing metathesis reactions on azinium salts: Straightforward access to quinolizinium cations and their dihydro derivatives
Nunez, Ana,Abarca, Beatriz,Cuadro, Ana M.,Alvarez-Builla, Julio,Vaquero, Juan J.
experimental part, p. 4166 - 4176 (2009/09/08)
(Chemical Equation Presented) The ring-closing metathesis reaction of 1-butenyl-2-vinylpyridinium salts and 2-butenyl-1-vinylpyridinium salts using Grubbs second generation and Hoveyda-Grubbs catalysts proved to be an efficient approach to 3,4-dihydro- and 1,2-dihydroquinolizinium salts and the corresponding quinolizinium derivatives by an improved thermal oxidation in the presence of Pd/C without solvent. A comparative study showed that the quinolizinium system was obtained in better yields through the 3,4-dihydroquinolizinium route, thus allowing the synthesis of quinolizinium derivatives or improvements in the yields of some examples reported previously.