Ring transformations of heterocyclic compounds. XXII. Pyrido [1, 2??a] indolium salts from 2??methyl??3H??indoles by pyrylium mediated three carbon annelation
T Zimmermann, L Hennig
Index: Zimmermann, Thomas; Hennig, Lothar Journal of Heterocyclic Chemistry, 2002 , vol. 39, # 2 p. 263 - 269
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Citation Number: 7
Abstract
Abstract The synthesis of pyrido [1, 2-a] indolium perchlorates 8, 11 from 2, 4, 6- triarylpyrylium perchlorates 1 and 2-methyl-3H-indoles 6, 9 in the presence of a basic condensing agent (anhydrous sodium acetate, piperidine acetate, triethylamine/acetic acid, triethylamine) in ethanol by a 2, 4-[C 3+ C 2 N] pyrylium ring transformation is reported. Spectroscopic data of the transformation products and their mode of formation are ...
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