ChemInform Abstract: Studies with Polyfuntionally Substituted Heteroaromatics: A Route for the Synthesis of Substituted (1,2,4)Triazolo(1,5‐a)pyridines.

Abstract

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Chemical Reactivity of 4,9‐Dimethoxy‐5‐oxo‐5H‐furo[3,2‐g]chromene‐6‐Carboxaldehyde Toward Some Nucleophilic Reagents

“…In the same manner, condensation of carboxaldehyde 1 with 1,6‐diaminopyridone derivative 29 in glacial acetic acid afforded furochromenopyridotriazepine derivative 30 (Scheme ). Structure of compound 30 was deduced from its correct elemental analysis and spectral data.…”

A new approach for the synthesis of bioactive heteroaryl thiazolidine-2,4-diones

“…Thus, condensation of 3 with o-phenylenediamine (13) and 4-(chlorophenyl)-1,6-diamino-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (14) 23 3 , H enone and H-5 thiadiazepine , respectively. The reaction of 3 with 1,4-binucleophiles proceeds via γ-pyrone ring opening followed by an intramolecular condensation reaction to effect cyclization leading to seven membered ring systems.…”

Synthesis and antimicrobial activity of chromone-linked 2-pyridone fused with 1,2,4-triazoles, 1,2,4-triazines and 1,2,4-triazepines ring systems

“…Product 4 was assumed to be formed via an initial addition of the active methylene of malononitrile to the hydrazone linkage in 3 to yield a Michael adduct A. This adduct dissociates into 2-cyanoacetohydrazide and 2, which then further react in the way described earlier by El-Najar and co-workers 21 triazole moiety in compound 5 and two singlet signals at d 2.75 and 2.91 ppm corresponding to the two methyl groups in compound 6.…”