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2002 fused pyridine derivatives fused pyridine derivatives R 0450 38 - 142 Ring Transformations of Heterocyclic Compounds. Part 22. Pyrido[1,2-a]indolium Salts from 2-Methyl-3H-indoles by Pyrylium Mediated Three Carbon Anellation. — Base-mediated reaction of 2-methylindoles with triarylpyrylium perchlorates (II) results in a 2,4-[C 3 +C 2 N] pyrylium ring transformation furnishing the title pyridoindolium salts such as (III) and (V). — (ZIMMERMANN, THOMAS; HENNIG, LOTHAR; J. Heterocycl. Chem. 39 (2002) 2, 263-269; Inst. Org. Chem., Univ. Leipzig, D-04103 Leipzig, Germany; EN) 1

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Page 1: Ring Transformations of Heterocyclic Compounds. Part 22. Pyrido[1,2-a]indolium Salts from 2-Methyl-3H-indoles by Pyrylium Mediated Three Carbon Anellation

2002 fused pyridine derivatives

fused pyridine derivativesR 0450

38 - 142Ring Transformations of Heterocyclic Compounds. Part 22.Pyrido[1,2-a]indolium Salts from 2-Methyl-3H-indoles by PyryliumMediated Three Carbon Anellation. — Base-mediated reaction of2-methylindoles with triarylpyrylium perchlorates (II) results in a 2,4-[C3+C2N]pyrylium ring transformation furnishing the title pyridoindolium salts suchas (III) and (V). — (ZIMMERMANN, THOMAS; HENNIG, LOTHAR; J.Heterocycl. Chem. 39 (2002) 2, 263-269; Inst. Org. Chem., Univ. Leipzig,D-04103 Leipzig, Germany; EN)

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