Ring transformations of heterocyclic compounds. XXII. Pyrido[1,2-a]indolium salts from 2-methyl-3H-indoles by pyrylium mediated three carbon annelation
Thomas Zimmermann, Lothar Hennig
Journal of Heterocyclic Chemistry
Volume 39 Issue 2, Pages 263 - 269
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http:// dx.doi.org/10.1002/jhet.5570390203