Tetrahedron p. 8459 - 8464 (1992)
Update date:2022-08-03
Topics:
Hajos
Riedl
Gacs-Baitz
Messmer
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
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