Selective ring closure to substituted pyrido[1,2-b]-as-triazinium salt

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Abstract

Reaction of arylglyoxal with 1,2-diaminopyridinium salt 1 under acidic conditions afforded 2-aryl-pyrido[1,2-b]-as-triazinium salt 9 selectively, whereas cyclization of the same dioxo compound with 1-amino-2-iminopyridine 5 under neutral conditions - due to "umpolung" of the exo nitrogen atom - led exclusively to the 3-aryl isomer 8.

Original languageEnglish
Pages (from-to)8459-8464
Number of pages6
JournalTetrahedron
Volume48
Issue number39
DOIs
Publication statusPublished - Sep 25 1992

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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